[GP15 Bulk, Size-fractionated, and Deionized Water Soluble Aerosol Fe Zn Cd Isotopes Leg 2] - Concentrations and stable isotopes of total and deionized water-soluble Fe, Zn, and Cd bulk aerosols and Fe concentrations and stable isotopes of coarse and fine aerosols from Leg 2  of the US GEOTRACES PMT cruise (GP15, RR1814) from Oct to Nov 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset reports concentrations and stable isotopes of total and deionized water-soluble iron (Fe), zinc (Zn), and cadmium (Cd) bulk aerosols and Fe concentrations and stable isotopes of coarse (>0.95 micrometers (µm)) and fine (<0.95 µm) aerosols collected durin Leg 2 (RR1815) of the US GEOTRACES GP15 Pacific Meridional Transect (PMT) cruise on R/V Roger Revelle from October to November 2018 on a meridional transect along 152°W from Alaska to Tahiti. Concentration and isotope data were collected by Zachary Bunnell, Dr. Matthias Sieber, and Dr. Tim Conway at the University of South Florida using a Thermo Neptune Plus MC-ICPMS following aerosol collection and processing by Dr. Clifton Buck's group. Trace metal isotope ratios are an important emerging tool in aerosols to trace aerosol sources of each metal. Data from Leg 1 of the cruise (RR1814) are available in a separate dataset.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Rosette_Position (unitless)
Sample_ID (unitless)
Fe_56_54_A_SMLH2O_DELTA_HIVOL_f0qtdh (per mil)
SE2_Fe_56_54_A_SMLH2O_DELTA_HIVOL_f0qtdh (per mil)
Flag_Fe_56_54_A_SMLH2O_DELTA_HIVOL_f0qtdh (unitless)
Cd_114_110_A_SMLH2O_DELTA_HIVOL_w0ytwa (per mil)
... (41 more variables)


[GP15 delta30Si Leg 1] - Depth profiles of the isotopic composition (δ30Si) of silicon within dissolved silicic acid from samples collected on Leg 1 of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
The isotopic composition of dissolved silicon (δ30Si) has proven to be a powerful tool to better understand the marine Si cycle. The δ30Si of seawater carries information about dissolved silicon utilization in surface waters, the subsequent dissolution of sinking biogenic material as well as water mass mixing. This data set supplies information on the spatial distribution of isotopes of Si within water masses from Tahiti to Alaska along GEOTRACES section GP15. This dataset results from leg 1 of the expedition, RR1814; data from RR1815 are available in a separate BCO-DMO dataset.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Event_ID (unitless)
Sample_ID (unitless)
Sample_Depth (decibars (db))
SILICATE_30_28_D_DELTA_BOTTLE_mmipkg (per mil)
SD1_SILICATE_30_28_D_DELTA_BOTTLE_mmipkg (per mil)
Flag_SILICATE_30_28_D_DELTA_BOTTLE_mmipkg (unitless)


[GP15 delta30Si Leg 2] - Depth profiles of the isotopic composition (δ30Si) of silicon within dissolved silicic acid from samples collected on Leg 2 of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
The isotopic composition of dissolved silicon (δ30Si) has proven to be a powerful tool to better understand the marine Si cycle. The δ30Si of seawater carries information about dissolved silicon utilization in surface waters, the subsequent dissolution of sinking biogenic material as well as water mass mixing. This data set supplies information on the spatial distribution of isotopes of Si within water masses from Tahiti to Alaska along GEOTRACES section GP15. This dataset results from leg 2 of the expedition, RR1815; data from RR1814 are available in a separate BCO-DMO dataset.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Event_ID (unitless)
Sample_ID (unitless)
Sample_Depth (decibars (db))
SILICATE_30_28_D_DELTA_BOTTLE_1foxwp (per mil)
SD1_SILICATE_30_28_D_DELTA_BOTTLE_1foxwp (per mil)
Flag_SILICATE_30_28_D_DELTA_BOTTLE_1foxwp (unitless)


[GP15 Dissolved and Labile Cobalt Leg 1] - Dissolved Cobalt and Labile Cobalt from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect)

Summary:
Dissolved Cobalt and Labile Cobalt from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (End ISO Date Time UTC, unitless)
latitude (degrees_north)
longitude (degrees_east)
End_Latitude (Latitude, decimal degrees North)
End_Longitude (Longitude, decimal degrees East)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample Depth, m)
Co_D_CONC_BOTTLE_ifernt (picomoles per kilogram (pmol/kg))
SD1_Co_D_CONC_BOTTLE_ifernt (picomoles per kilogram (pmol/kg))
Flag_Co_D_CONC_BOTTLE_ifernt (unitless)
L1Co_D_CONC_BOTTLE_v2phpz (L1 Co D CONC BOTTLE V2phpz, picomoles per kilogram (pmol/kg))
SD1_L1Co_D_CONC_BOTTLE_v2phpz (SD1 L1 Co D CONC BOTTLE V2phpz, picomoles per kilogram (pmol/kg))
Flag_L1Co_D_CONC_BOTTLE_v2phpz (Flag L1 Co D CONC BOTTLE V2phpz, unitless)
Co_D_CONC_FISH_s5r59b (picomoles per kilogram (pmol/kg))
SD1_Co_D_CONC_FISH_s5r59b (picomoles per kilogram (pmol/kg))
Flag_Co_D_CONC_FISH_s5r59b (unitless)
L1Co_D_CONC_FISH_7wnxlt (L1 Co D CONC FISH 7wnxlt, picomoles per kilogram (pmol/kg))
SD1_L1Co_D_CONC_FISH_7wnxlt (SD1 L1 Co D CONC FISH 7wnxlt, picomoles per kilogram (pmol/kg))
Flag_L1Co_D_CONC_FISH_7wnxlt (Flag L1 Co D CONC FISH 7wnxlt, unitless)


[GP15 Dissolved and Labile Cobalt Leg 2] - Dissolved Cobalt and Labile Cobalt from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 (US GEOTRACES Pacific Meridional Transect)

Summary:
Dissolved Cobalt and Labile Cobalt from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (End ISO Date Time UTC, unitless)
latitude (degrees_north)
longitude (degrees_east)
End_Latitude (Latitude, decimal degrees North)
End_Longitude (Longitude, decimal degrees East)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample Depth, m)
Co_D_CONC_BOTTLE_0vn2hs (picomoles per kilogram (pmol/kg))
SD1_Co_D_CONC_BOTTLE_0vn2hs (picomoles per kilogram (pmol/kg))
Flag_Co_D_CONC_BOTTLE_0vn2hs (unitless)
L1Co_D_CONC_BOTTLE_mgxi4u (L1 Co D CONC BOTTLE Mgxi4u, picomoles per kilogram (pmol/kg))
SD1_L1Co_D_CONC_BOTTLE_mgxi4u (SD1 L1 Co D CONC BOTTLE Mgxi4u, picomoles per kilogram (pmol/kg))
Flag_L1Co_D_CONC_BOTTLE_mgxi4u (Flag L1 Co D CONC BOTTLE Mgxi4u, unitless)
Co_D_CONC_FISH_r17gqs (picomoles per kilogram (pmol/kg))
SD1_Co_D_CONC_FISH_r17gqs (picomoles per kilogram (pmol/kg))
Flag_Co_D_CONC_FISH_r17gqs (unitless)
L1Co_D_CONC_FISH_u2dkub (L1 Co D CONC FISH U2dkub, picomoles per kilogram (pmol/kg))
SD1_L1Co_D_CONC_FISH_u2dkub (SD1 L1 Co D CONC FISH U2dkub, picomoles per kilogram (pmol/kg))
Flag_L1Co_D_CONC_FISH_u2dkub (Flag L1 Co D CONC FISH U2dkub, unitless)


[GP15 Dissolved Ba Cd Cu Ga Mn Ni and Pb Leg 1] - Dissolved concentrations of Ba, Cd, Cu, Ga, Mn, Ni, and Pb from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
Dissolved concentrations of Ba, Cd, Cu, Ga, Mn, Ni, and Pb from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample_depth, m)
CTD_Pressure (decibars (dbar))
Ba_D_CONC_BOTTLE_hndhco (nanomoles per kilogram (nmol/kg))
SD1_Ba_D_CONC_BOTTLE_hndhco (nanomoles per kilogram (nmol/kg))
Flag_Ba_D_CONC_BOTTLE_hndhco (unitless)
Ba_D_CONC_FISH_nwzpfg (nanomoles per kilogram (nmol/kg))
SD1_Ba_D_CONC_FISH_nwzpfg (nanomoles per kilogram (nmol/kg))
Flag_Ba_D_CONC_FISH_nwzpfg (unitless)
Cd_D_CONC_BOTTLE_3qngnv (nanomoles per kilogram (nmol/kg))
SD1_Cd_D_CONC_BOTTLE_3qngnv (nanomoles per kilogram (nmol/kg))
Flag_Cd_D_CONC_BOTTLE_3qngnv (unitless)
Cd_D_CONC_FISH_rysl9e (nanomoles per kilogram (nmol/kg))
... (32 more variables)


[GP15 Dissolved Ba Cd Cu Ga Mn Ni and Pb Leg 2] - Dissolved concentrations of Ba, Cd, Cu, Ga, Mn, Ni, and Pb from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
Dissolved concentrations of Ba, Cd, Cu, Ga, Mn, Ni, and Pb from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample_depth, m)
CTD_Pressure (decibars (dbar))
Ba_D_CONC_BOTTLE_6yrfu2 (nanomoles per kilogram (nmol/kg))
SD1_Ba_D_CONC_BOTTLE_6yrfu2 (nanomoles per kilogram (nmol/kg))
Flag_Ba_D_CONC_BOTTLE_6yrfu2 (unitless)
Ba_D_CONC_FISH_zlfwni (nanomoles per kilogram (nmol/kg))
SD1_Ba_D_CONC_FISH_zlfwni (nanomoles per kilogram (nmol/kg))
Flag_Ba_D_CONC_FISH_zlfwni (unitless)
Cd_D_CONC_BOTTLE_s0muvq (nanomoles per kilogram (nmol/kg))
SD1_Cd_D_CONC_BOTTLE_s0muvq (nanomoles per kilogram (nmol/kg))
Flag_Cd_D_CONC_BOTTLE_s0muvq (unitless)
Cd_D_CONC_FISH_awbbbh (nanomoles per kilogram (nmol/kg))
... (32 more variables)


[GP15 Dissolved Radium-226 and Radium-228 Leg 1] - Water column dissolved radium-226 and radium-228 from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
Water column dissolved radium-226 and radium-228 from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018. In this dataset version (v4), there have been corrections made to sample depths and sample ID numbers.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Event_ID (unitless)
Sample_ID_228Ra (unitless)
Sample_ID_226Ra (unitless)
Sample_Depth_Corr_226Ra (m)
Sample_Depth_Corr_228Ra (m)
Ra_226_D_CONC_BOTTLE_9ajov6 (milliBecquerels per kilogram (mBq/kg))
SD1_Ra_226_D_CONC_BOTTLE_9ajov6 (milliBecquerels per kilogram (mBq/kg))
Flag_Ra_226_D_CONC_BOTTLE_9ajov6 (unitless)
Ra_228_D_CONC_PUMP_0wrh9t (milliBecquerels per kilogram (mBq/kg))
SD1_Ra_228_D_CONC_PUMP_0wrh9t (milliBecquerels per kilogram (mBq/kg))
Flag_Ra_228_D_CONC_PUMP_0wrh9t (unitless)


[GP15 Dissolved Radium-226 and Radium-228 Leg 2] - Water column dissolved radium-226 and radium-228 from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
Water column dissolved radium-226 and radium-228 from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018. In this dataset version (v4), there have been corrections made to sample depths and sample ID numbers.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Event_ID (unitless)
Sample_ID_228Ra (unitless)
Sample_ID_226Ra (unitless)
Sample_Depth_Corr_226Ra (m)
Sample_Depth_Corr_228Ra (m)
Ra_226_D_CONC_BOTTLE_zkto8n (milliBecquerels per kilogram (mBq/kg))
SD1_Ra_226_D_CONC_BOTTLE_zkto8n (milliBecquerels per kilogram (mBq/kg))
Flag_Ra_226_D_CONC_BOTTLE_zkto8n (unitless)
Ra_228_D_CONC_PUMP_eokmy1 (milliBecquerels per kilogram (mBq/kg))
SD1_Ra_228_D_CONC_PUMP_eokmy1 (milliBecquerels per kilogram (mBq/kg))
Flag_Ra_228_D_CONC_PUMP_eokmy1 (unitless)


[GP15 Dissolved Rare Earth Elements Leg 1] - Dissolved concentrations of rare earth elements (including Y) from Leg 1 of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset reports dissolved concentrations of rare earth elements (including Y) from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 along 152 W. The data include dissolved concentrations from bottle and towed fish samples. Including the data from Leg 2 (Hilo, HI to Papeete, French Polynesia), the PMT sampled margin interactions, subarctic high nutrient low chlorophyll waters, the oldest deep water in the world's oceans, the distal ends of hydrothermal plumes (Juan de Fuca Ridge and East Pacific Rise) and oxygen minimum zones, equatorial upwelling, and oligotrophic waters in the South Pacific gyre at 20°S. The rare earth element data are pertinent for studies of removal and internal cycling of trace elements, tracing material inputs, and understanding of conservative vs non-conservative tracer distributions.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Rosette_Position (unitless)
Sample_ID (unitless)
depth (Sample_depth, m)
Y_D_CONC_BOTTLE_501nbz (picomoles per kilogram (pmol/kg))
SD1_Y_D_CONC_BOTTLE_501nbz (picomoles per kilogram (pmol/kg))
Flag_Y_D_CONC_BOTTLE_501nbz (unitless)
Y_D_CONC_FISH_eets1q (picomoles per kilogram (pmol/kg))
SD1_Y_D_CONC_FISH_eets1q (picomoles per kilogram (pmol/kg))
Flag_Y_D_CONC_FISH_eets1q (unitless)
La_D_CONC_BOTTLE_yzfgzr (picomoles per kilogram (pmol/kg))
SD1_La_D_CONC_BOTTLE_yzfgzr (picomoles per kilogram (pmol/kg))
... (82 more variables)


[GP15 Dissolved Rare Earth Elements Leg 2] - Dissolved concentrations of rare earth elements (including Y) from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset reports dissolved concentrations of rare earth elements (including Y) from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 along 152 W. The data include dissolved concentrations from bottle and towed fish samples. Including the data from Leg 1 (Seattle, WA to Hilo, HI), the PMT sampled margin interactions, subarctic high nutrient low chlorophyll waters, the oldest deep water in the world's oceans, the distal ends of hydrothermal plumes (Juan de Fuca Ridge and East Pacific Rise) and oxygen minimum zones, equatorial upwelling, and oligotrophic waters in the South Pacific gyre at 20°S. The rare earth element data are pertinent for studies of removal and internal cycling of trace elements, tracing material inputs, and understanding of conservative vs non-conservative tracer distributions.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Rosette_Position (unitless)
Sample_ID (unitless)
depth (Sample_depth, m)
Y_D_CONC_BOTTLE_vbtqm7 (picomoles per kilogram (pmol/kg))
SD1_Y_D_CONC_BOTTLE_vbtqm7 (picomoles per kilogram (pmol/kg))
Flag_Y_D_CONC_BOTTLE_vbtqm7 (unitless)
Y_D_CONC_FISH_asoboe (picomoles per kilogram (pmol/kg))
SD1_Y_D_CONC_FISH_asoboe (picomoles per kilogram (pmol/kg))
Flag_Y_D_CONC_FISH_asoboe (unitless)
La_D_CONC_BOTTLE_19sfbu (picomoles per kilogram (pmol/kg))
SD1_La_D_CONC_BOTTLE_19sfbu (picomoles per kilogram (pmol/kg))
... (82 more variables)


[GP15 Dissolved Th and Pa - Leg 1] - Dissolved thorium and protactinium isotopes (232Th, 230Th, 231Pa) in seawater from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset contains concentrations of dissolved thorium and protactinium isotopes (232Th, 230Th, 231Pa) in seawater collected during the U.S. GEOTRACES Pacific Meridional Transect (PMT) GP15, from Alaska to Tahiti, on the R/V Roger Revelle. The PMT expedition was divided into two legs, with cruise IDs RR1814 and RR1815. This dataset results from leg 1, RR1814; data from RR1815 are available in a separate BCO-DMO dataset. This is compiled data produced by three laboratories with the following associations: Lamont-Doherty Earth Observatory of Columbia University (LDEO), the University of Southern Mississippi (USM), and the University of Minnesota (UMN).

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Cast_number (unitless)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample_depth, m)
Lab_ID (unitless)
Bottle_ID (unitless)
Th_230_D_CONC_BOTTLE_m5ivgp (micro-Becquerel per kilogram water (uBq/kg))
SD1_Th_230_D_CONC_BOTTLE_m5ivgp (micro-Becquerel per kilogram water (uBq/kg))
Flag_Th_230_D_CONC_BOTTLE_m5ivgp (unitless)
Th_232_D_CONC_BOTTLE_vwrb8w (picomole per kilogram water (pmol/kg))
... (26 more variables)


[GP15 Dissolved Th and Pa - Leg 2] - Dissolved thorium and protactinium isotopes (232Th, 230Th, 231Pa) in seawater from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset contains concentrations of dissolved thorium and protactinium isotopes (232Th, 230Th, 231Pa) in seawater collected during the U.S. GEOTRACES Pacific Meridional Transect (PMT) GP15, from Alaska to Tahiti, on the R/V Roger Revelle. The PMT expedition was divided into two legs, with cruise IDs RR1814 and RR1815. This dataset results from leg 2, RR1815; data from RR1814 are available in a separate BCO-DMO dataset. This is compiled data produced by three laboratories with the following associations: Lamont-Doherty Earth Observatory of Columbia University (LDEO), the University of Southern Mississippi (USM), and the University of Minnesota (UMN).

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Cast_number (unitless)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample_depth, m)
Lab_ID (unitless)
Bottle_ID (unitless)
Th_230_D_CONC_BOTTLE_aajvje (micro-Becquerel per kilogram water (uBq/kg))
SD1_Th_230_D_CONC_BOTTLE_aajvje (micro-Becquerel per kilogram water (uBq/kg))
Flag_Th_230_D_CONC_BOTTLE_aajvje (unitless)
Th_232_D_CONC_BOTTLE_mj1tw8 (picomole per kilogram water (pmol/kg))
... (26 more variables)


[GP15 Heavy Noble Gas Concentrations Leg 1] - Concentrations of dissolved argon, krypton, and xenon from Niskin bottle samples collected on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from Sept-Oct 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset includes concentrations of dissolved argon (Ar), krypton (Kr), and xenon (Xe) from Niskin bottle samples on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
DATE (unitless)
time_unitless (Time, unitless)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Cast_number (unitless)
SAMPNO (unitless)
GEOTRC_EVENTNO (unitless)
GEOTRC_SAMPNO (unitless)
depth (Sample_depth, m)
Kr_D_CONC_BOTTLE_bvbdxg (nanomoles per kilogram (nmol/kg))
SD1_Kr_D_CONC_BOTTLE_bvbdxg (nanomoles per kilogram (nmol/kg))
Flag_Kr_D_CONC_BOTTLE_bvbdxg (unitless)
Ar_D_CONC_BOTTLE_qphaf3 (micromoles per kilogram (umol/kg))
SD1_Ar_D_CONC_BOTTLE_qphaf3 (micromoles per kilogram (umol/kg))
Flag_Ar_D_CONC_BOTTLE_qphaf3 (unitless)
Xe_D_CONC_BOTTLE_2idk2h (nanomoles per kilogram (nmol/kg))
SD1_Xe_D_CONC_BOTTLE_2idk2h (nanomoles per kilogram (nmol/kg))
Flag_Xe_D_CONC_BOTTLE_2idk2h (unitless)


[GP15 Heavy Noble Gas Concentrations Leg 2] - Concentrations of dissolved argon, krypton, and xenon from Niskin bottle samples collected on Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset includes concentrations of dissolved argon (Ar), krypton (Kr), and xenon (Xe) from Niskin bottle samples collected on Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
DATE (unitless)
time_unitless (Time, unitless)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Cast_number (unitless)
SAMPNO (unitless)
GEOTRC_EVENTNO (unitless)
GEOTRC_SAMPNO (unitless)
depth (Sample_depth, m)
Kr_D_CONC_BOTTLE_uo0lmf (nanomoles per kilogram (nmol/kg))
SD1_Kr_D_CONC_BOTTLE_uo0lmf (nanomoles per kilogram (nmol/kg))
Flag_Kr_D_CONC_BOTTLE_uo0lmf (unitless)
Ar_D_CONC_BOTTLE_unjql9 (micromoles per kilogram (umol/kg))
SD1_Ar_D_CONC_BOTTLE_unjql9 (micromoles per kilogram (umol/kg))
Flag_Ar_D_CONC_BOTTLE_unjql9 (unitless)
Xe_D_CONC_BOTTLE_xoirom (nanomoles per kilogram (nmol/kg))
SD1_Xe_D_CONC_BOTTLE_xoirom (nanomoles per kilogram (nmol/kg))
Flag_Xe_D_CONC_BOTTLE_xoirom (unitless)


[GP15 HPLC pigments Leg 1] - Pigment concentrations determined by HPLC from samples collected on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset contains high-performance liquid chromatography (HPLC) pigment data (19But, 19Hex, Allo, β Car, α Car, Chl a, Chl b, Chlc 1,2, Chl c 3, Cphlid, Diadino, Diato, Fuco, Lut, Neo, Peri, Prasino, Viola, Zea) from the U.S. GEOTRACES GP15 Pacific Meridional Transect from Alaska (56°M) to Tahiti (20°S) along 152°W between September 24, 2018 and November 24, 2018. Samples for pigment analysis were collected at 6 depths at every major station (N=23 stations) and filtered onto GF/F filters, which were frozen at -80°C until analysis at the HPLC Facility at Oregon State University managed by Ricardo Letelier (https://ceoas.oregonstate.edu/ocean-ecology-and-biogeochemistry-facilities). Samples were extracted and analyzed on a Waters 996 absorbance photodiode array detector in combination with a Waters 2475 fluorescence detector in September 2019.

These data were collected by the GP15 management team to provide biological context for the geochemical measurements made by GEOTRACES PIs. This dataset contains the data from Leg 1 of the cruise (RR1814), from Seattle, Washington, USA to Hilo, Hawaii, USA. Leg 2 data are provided in a separate dataset (see 'Related Datasets' section of metadata).

cdm_data_type = Other
VARIABLES:
Start_Date_UTC (unitless)
Event_ID (unitless)
Sample_ID (unitless)
Niskin (unitless)
depth (Sample_depth, m)
Station_ID (unitless)
Cast_number (unitless)
Start_Latitude (degrees_north)
longitude (Start_longitude, degrees_east)
But_fuco_HPLC_TP_CONC_BOTTLE_dnax4l (nanograms per liter (ng/L))
Hex_fuco_HPLC_TP_CONC_BOTTLE_aeqqpa (nanograms per liter (ng/L))
Allo_HPLC_TP_CONC_BOTTLE_n3dfmg (nanograms per liter (ng/L))
Beta_Car_HPLC_TP_CONC_BOTTLE_weksrk (nanograms per liter (ng/L))
Alpha_Car_HPLC_TP_CONC_BOTTLE_kc31kx (nanograms per liter (ng/L))
... (14 more variables)


[GP15 HPLC pigments Leg 2] - Pigment concentrations determined by HPLC from samples collected on Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset contains high-performance liquid chromatography (HPLC) pigment data (19But, 19Hex, Allo, β Car, α Car, Chl a, Chl b, Chlc 1,2, Chl c 3, Cphlid, Diadino, Diato, Fuco, Lut, Neo, Peri, Prasino, Viola, Zea) from the U.S. GEOTRACES GP15 Pacific Meridional Transect from Alaska (56°M) to Tahiti (20°S) along 152°W between September 24, 2018 and November 24, 2018. Samples for pigment analysis were collected at 6 depths at every major station (N=23 stations) and filtered onto GF/F filters, which were frozen at -80°C until analysis at the HPLC Facility at Oregon State University managed by Ricardo Letelier (https://ceoas.oregonstate.edu/ocean-ecology-and-biogeochemistry-facilities). Samples were extracted and analyzed on a Waters 996 absorbance photodiode array detector in combination with a Waters 2475 fluorescence detector in September 2019.

These data were collected by the GP15 management team to provide biological context for the geochemical measurements made by GEOTRACES PIs. This dataset contains the data from Leg 1 of the cruise (RR1815), from Hilo, Hawaii, USA to Papeete, French Polynesia. Leg 1 data are provided in a separate dataset (see 'Related Datasets' section of metadata).

cdm_data_type = Other
VARIABLES:
Start_Date_UTC (unitless)
Event_ID (unitless)
Sample_ID (unitless)
Niskin (unitless)
depth (Sample_depth, m)
Station_ID (unitless)
Cast_number (unitless)
Start_Latitude (degrees_north)
longitude (Start_longitude, degrees_east)
But_fuco_HPLC_TP_CONC_BOTTLE_myzyux (nanograms per liter (ng/L))
Hex_fuco_HPLC_TP_CONC_BOTTLE_tlemch (nanograms per liter (ng/L))
Allo_HPLC_TP_CONC_BOTTLE_2aonag (nanograms per liter (ng/L))
Beta_Car_HPLC_TP_CONC_BOTTLE_ad2mxm (nanograms per liter (ng/L))
Alpha_Car_HPLC_TP_CONC_BOTTLE_rcv9le (nanograms per liter (ng/L))
... (14 more variables)


[GP15 Inert Copper and Iodine Redox Speciation Leg 1] - Inert copper and inorganic iodine concentrations from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset includes inert copper and inorganic iodine concentrations from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814), which took place on R/V Roger Revelle from September to October 2018. Iodate was analyzed on UV-Vis Spectrophotometer while Iodide was analyzed on the Hanging Mercury Drop Electrode with the Cathodic Square Wave Stripping Voltammetry setting. Inert copper was determined by Rintaro Moriyasu using the solvent extraction method published in Moriyasu & Moffett, 2022 (doi: 10.1016/j.marchem.2021.104073).

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Cast_number (unitless)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample_depth, m)
L1Cu_D_CONC_BOTTLE_ypaxln (nanomoles per kilogram (nmol/kg))
SD1_L1Cu_D_CONC_BOTTLE_ypaxln (nanomoles per kilogram (nmol/kg))
Flag_L1Cu_D_CONC_BOTTLE_ypaxln (unitless)
I_neg1_D_CONC_BOTTLE_byhuiw (nanomoles per liter (nmol/L))
SD1_I_neg1_D_CONC_BOTTLE_byhuiw (nanomoles per liter (nmol/L))
Flag_I_neg1_D_CONC_BOTTLE_byhuiw (unitless)
I_V_D_CONC_BOTTLE_qlcfpy (nanomoles per liter (nmol/L))
SD1_I_V_D_CONC_BOTTLE_qlcfpy (nanomoles per liter (nmol/L))
Flag_I_V_D_CONC_BOTTLE_qlcfpy (unitless)


[GP15 Inert Copper and Iodine Redox Speciation Leg 2] - Inert copper and inorganic iodine concentrations from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES PMT cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset includes inert copper and inorganic iodine concentrations from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES PMT cruise (GP15, RR1815), which was conducted on R/V Roger Revelle from October to November 2018. Iodate was analyzed on UV-Vis Spectrophotometer while Iodide was analyzed on the Hanging Mercury Drop Electrode with the Cathodic Square Wave Stripping Voltammetry setting. Inert copper was determined by Rintaro Moriyasu using the solvent extraction method published in Moriyasu & Moffett, 2022 (doi: 10.1016/j.marchem.2021.104073).

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Cast_number (unitless)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample_depth, m)
L1Cu_D_CONC_BOTTLE_ypaxln (nanomoles per kilogram (nmol/kg))
SD1_L1Cu_D_CONC_BOTTLE_ypaxln (nanomoles per kilogram (nmol/kg))
Flag_L1Cu_D_CONC_BOTTLE_ypaxln (unitless)
I_neg1_D_CONC_BOTTLE_udxopu (nanomoles per liter (nmol/L))
SD1_I_neg1_D_CONC_BOTTLE_udxopu (nanomoles per liter (nmol/L))
Flag_I_neg1_D_CONC_BOTTLE_udxopu (unitless)
I_V_D_CONC_BOTTLE_x9ogsn (nanomoles per liter (nmol/L))
SD1_I_V_D_CONC_BOTTLE_x9ogsn (nanomoles per liter (nmol/L))
Flag_I_V_D_CONC_BOTTLE_x9ogsn (unitless)


[GP15 Iron Ligands in Particles] - Iron ligand concentration in particles (1-51 μm) analyzed by liquid chromatography-mass spectrometry from samples collected on the US GEOTRACES Pacific Meridional Transect (PMT) cruise RR1814 (GP15) on R/V Roger Revelle in October 2018 (Trace Element Organic Speciation along the US GEOTRACES Pacific Meridional Transect)

Summary:
This dataset includes iron ligand concentration in particles (1-51 μm) analyzed by liquid chromatography-mass spectrometry. Samples were collected on the US GEOTRACES Pacific Meridional Transect (PMT) cruises (GP15, RR1814 & RR1815) on R/V Roger Revelle from September to November 2018.

cdm_data_type = Other
VARIABLES:
Sample (unitless)
Station (unitless)
Lat (degrees_north)
longitude (degrees_east)
depth (m)
Ferrioxamine_G (picomolar (pM))
time (Iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)


[GP15 Iron Ligands] - Iron ligand speciation profiles analyzed by liquid chromatography-mass spectrometry from samples collected on the US GEOTRACES Pacific Meridional Transect (PMT) cruises (GP15, RR1814 & RR1815) on R/V Roger Revelle from September to November 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset includes iron ligand speciation profiles analyzed by liquid chromatography-mass spectrometry. Samples were collected on the US GEOTRACES Pacific Meridional Transect (PMT) cruises (GP15, RR1814 & RR1815) on R/V Roger Revelle from September to November 2018.

cdm_data_type = Other
VARIABLES:
Station (unitless)
GEOTRACES_ID (unitless)
FeSiderophores_56_DSPEENV_CONC_BOTTLE (pmole/liter)
FePolarligandA_56_DSPEENV_CONC_BOTTLE (pmole/liter)
Flag_FePolarligandA_56_DSPEENV_CONC_BOTTLE (unitless)
FePolarligandB_56_DSPEENV_CONC_BOTTLE (pmole/liter)
Flag_FePolarligandB_56_DSPEENV_CONC_BOTTLE (unitless)
FePolarligandC_56_DSPEENV_CONC_BOTTLE (pmole/liter)
Flag_FePolarligandC_56_DSPEENV_CONC_BOTTLE (unitless)
FePolarligandD_56_DSPEENV_CONC_BOTTLE (pmole/liter)
Flag_FePolarligandD_56_DSPEENV_CONC_BOTTLE (unitless)
FePolarligandE_56_DSPEENV_CONC_BOTTLE (pmole/liter)
Flag_FePolarligandE_56_DSPEENV_CONC_BOTTLE (unitless)
FeMarinobactinA_56_DSPEENV_CONC_BOTTLE (pmole/liter)
Flag_FeMarinobactinA_56_DSPEENV_CONC_BOTTLE (unitless)
FeMarinobactinB_56_DSPEENV_CONC_BOTTLE (pmole/liter)
Flag_FeMarinobactinB_56_DSPEENV_CONC_BOTTLE (unitless)
FeMarinobactinC_56_DSPEENV_CONC_BOTTLE (pmole/liter)
Flag_FeMarinobactinC_56_DSPEENV_CONC_BOTTLE (unitless)
FeMarinobactinD_56_DSPEENV_CONC_BOTTLE (pmole/liter)
Flag_FeMarinobactinD_56_DSPEENV_CONC_BOTTLE (unitless)
FeMarinobactinE_56_DSPEENV_CONC_BOTTLE (pmole/liter)
Flag_FeMarinobactinE_56_DSPEENV_CONC_BOTTLE (unitless)


[GP15 Nd isotopes Leg 1] - Neodymium (Nd) isotopes measured from dissolved seawater on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
The goal of the international GEOTRACES program is to understand the distributions of trace chemical elements and their isotopes in the oceans. Neodymium (Nd) isotopes are widely recognized for their utility as tracers of water transport and as indicators of the sources of trace elements to the oceans. Neodymium isotopes have been designated as "key parameters" to be measured on GEOTRACES expeditions. The data here represent Nd isotopes measured from dissolved seawater on the GP15 GEOTRACES expedition in the Pacific Ocean. The North Pacific is a particularly interesting place to measure Nd isotopes because North Pacific and North Atlantic deep waters represent the two end-members of deep ocean composition, and the few data available so far in the North Pacific differ from expectations based on mixing of known water types. These data are dissolved Nd isotopes measured in profiles at stations on the first leg of the cruise, RR1814.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Sample_ID (unitless)
depth (Sample_depth, m)
Nd_143_144_D_EPSILON_BOTTLE_iljaq8 (epsilon notation (parts per 10,000))
SD1_Nd_143_144_D_EPSILON_BOTTLE_iljaq8 (epsilon notation (parts per 10,000))
Flag_Nd_143_144_D_EPSILON_BOTTLE_iljaq8 (unitless)


[GP15 Nd isotopes Leg 2] - Neodymium (Nd) isotopes measured from dissolved seawater on Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
The goal of the international GEOTRACES program is to understand the distributions of trace chemical elements and their isotopes in the oceans. Neodymium (Nd) isotopes are widely recognized for their utility as tracers of water transport and as indicators of the sources of trace elements to the oceans. Neodymium isotopes have been designated as "key parameters" to be measured on GEOTRACES expeditions. The data here represent Nd isotopes measured from dissolved seawater on the GP15 GEOTRACES expedition in the Pacific Ocean. The North Pacific is a particularly interesting place to measure Nd isotopes because North Pacific and North Atlantic deep waters represent the two end-members of deep ocean composition, and the few data available so far in the North Pacific differ from expectations based on mixing of known water types. These data are dissolved Nd isotopes measured in profiles at stations on the second leg of the cruise, RR1815.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Sample_ID (unitless)
depth (Sample_depth, m)
Nd_143_144_D_EPSILON_BOTTLE_x2epvg (epsilon notation (parts per 10,000))
SD1_Nd_143_144_D_EPSILON_BOTTLE_x2epvg (epsilon notation (parts per 10,000))
Flag_Nd_143_144_D_EPSILON_BOTTLE_x2epvg (unitless)


[GP15 Nitrate d15N and d18O Leg 1] - Nitrate d15N and d18O from Niskin bottle samples collected on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
These data include nitrate δ15N and δ18O along US GEOTRACES GP15, a meridional transect at ~152°W in the Pacific Ocean. The Pacific hosts significant rates of all the fluxes that are relevant to the global N cycle: the N budget fluxes (those that either generate or consume fixed N; N2 fixation and denitrification) as well as the N fluxes from the internal N cycle (those that generate or consume nitrate but leave the fixed N pool unaltered; nitrate regeneration and assimilation). The nitrate δ15N and δ18O provide a useful tool to separate and possibly quantify the overlapping impacts of all these co-occurring processes.

GP15 was a 60-day research cruise that took place in 2018 along a transect form Alaska to Tahiti at 152° W on board of the R/V Revelle. The cruise was completed in two legs (RR1814 and RR1815), which started on the 18th of September and on the 24th of October 2018, respectively. This dataset includes data from Leg 1 (RR1814). Leg 2 data (RR1815) are provided in a separate, related dataset.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Sample_ID (unitless)
depth (Sample_depth, m)
NITRATE_15_14_D_DELTA_BOTTLE_lnw6zq (per mil versus air)
SD1_NITRATE_15_14_D_DELTA_BOTTLE_lnw6zq (per mil versus air)
... (5 more variables)


[GP15 Nitrate d15N and d18O Leg 2] - Nitrate d15N and d18O from Niskin bottle samples collected on Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from October to November 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
These data include nitrate δ15N and δ18O along US GEOTRACES GP15, a meridional transect at ~152°W in the Pacific Ocean. The Pacific hosts significant rates of all the fluxes that are relevant to the global N cycle: the N budget fluxes (those that either generate or consume fixed N; N2 fixation and denitrification) as well as the N fluxes from the internal N cycle (those that generate or consume nitrate but leave the fixed N pool unaltered; nitrate regeneration and assimilation). The nitrate δ15N and δ18O provide a useful tool to separate and possibly quantify the overlapping impacts of all these co-occurring processes.

GP15 was a 60-day research cruise that took place in 2018 along a transect form Alaska to Tahiti at 152° W on board of the R/V Revelle. The cruise was completed in two legs (RR1814 and RR1815), which started on the 18th of September and on the 24th of October 2018, respectively. This dataset includes data from Leg 2 (RR1815). Leg 1 data (RR1814) are provided in a separate, related dataset.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Sample_ID (unitless)
depth (Sample_depth, m)
NITRATE_15_14_D_DELTA_BOTTLE_w2kmnp (per mil versus air)
SD1_NITRATE_15_14_D_DELTA_BOTTLE_w2kmnp (per mil versus air)
... (5 more variables)


[GP15 Particle birefringence photon yield and particle beam attenuation coefficient derived from McLane logging CTD] - Particle birefringence photon yield and particle beam attenuation coefficient derived from a logging CTD deployed during McLane Pump casts on the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15) on R/V Roger Revelle from Sept-Nov 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This data set was derived from a logging CTD deployed during McLane Pump casts as part of the GEOTRACES Pacific Meridional Transect (GP15 expedition). There are several related data files provided. The primary data files include: (1) data for the 0-500 meters (m) depth interval, including measures of particle birefringence photon yield (units of parts per million per meter) and particle beam attenuation coefficient (units of per meter); and (2) 0-500 m McLane optics profiles data by broken down by specific cast number and deployment phase. Supplemental files include data for the full depth of the water column (6000 meters) and CTD data used in the reduction of optical birefringence yield and for the calculation of particle beam attenuation coefficient.

cdm_data_type = Other
VARIABLES:
station (unitless)
latitude (degrees_north)
longitude (Long, degrees_east)
jdays (unitless)
time (Iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
track_km (kilometers (km))
PPZ_depth (m)
depth (m)
depth_n (unitless)
press (decibars (db))
temp (degrees Celsius)
temp_sd (degrees Celsius)
sal (practical salinity units (PSU))
sal_sd (practical salinity units (PSU))
pic011Biref_av (parts per million per meter (ppm m-1))
pic011Biref_av_sd (parts per million per meter (ppm m-1))
pic011Biref_av_n (unitless)
cp1450_av (parts per million per meter (ppm m-1))
cp1450_av_sd (parts per million per meter (ppm m-1))
... (7 more variables)


[GP15 Particulate Thorium and Protactinium Leg 1] - Size-fractionated particulate thorium and protactinium isotopes in seawater from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset contains concentrations of size-fractionated particulate thorium and protactinium isotopes (Th-232, Th-230, Pa-231) in seawater collected during the U.S. GEOTRACES Pacific Meridional Transect GP15; Alaska to Tahiti) on the Roger Revelle (RR1814 and RR1815) from 18 September – 24 November 2018. This is compiled data produced by three laboratories with the following associations: Lamont-Doherty Earth Observatory of Columbia University (LDEO), the University of Southern Mississippi (USM), and the University of Minnesota (UMN). A report will be submitted for review by the International GEOTRACES Standards and Intercalibration (S&I) Committee. This dataset contains data from Leg 1 of the expedition (RR1814). Data from leg 2 are available in a separate BCO-DMO dataset.

cdm_data_type = Other
VARIABLES:
Cruise_ID (unitless)
Station_ID (unitless)
Cast_ID (unitless)
Event_ID (unitless)
Gear_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Sample_ID (unitless)
Lab_ID_SPT (unitless)
Lab_ID_LPT (unitless)
depth (Sample_depth, m)
Sample_Depth_Flag (unitless)
Th_232_SPT_CONC_PUMP_zuir1n (picomoles per kilogram (pmol/kg))
SD1_Th_232_SPT_CONC_PUMP_zuir1n (picomoles per kilogram (pmol/kg))
Flag_Th_232_SPT_CONC_PUMP_zuir1n (unitless)
Th_230_SPT_CONC_PUMP_jit90a (micro-Becquerel per kilogram (uBq/kg))
... (38 more variables)


[GP15 Particulate Thorium and Protactinium Leg 2] - Size-fractionated particulate thorium and protactinium isotopes in seawater from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
This dataset contains concentrations of size-fractionated particulate thorium and protactinium isotopes (Th-232, Th-230, Pa-231) in seawater collected during the U.S. GEOTRACES Pacific Meridional Transect GP15; Alaska to Tahiti) on the Roger Revelle (RR1814 and RR1815) from 18 September – 24 November 2018. This is compiled data produced by three laboratories with the following associations: Lamont-Doherty Earth Observatory of Columbia University (LDEO), the University of Southern Mississippi (USM) and the University of Minnesota (UMN). A report will be submitted for review by the International GEOTRACES Standards and Intercalibration (S&I) Committee. This dataset contains data from Leg 2 of the expedition (RR1815). Data from leg 1 are available in a separate BCO-DMO dataset.

cdm_data_type = Other
VARIABLES:
Cruise_ID (unitless)
Station_ID (unitless)
Cast_ID (unitless)
Event_ID (unitless)
Gear_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Sample_ID (unitless)
Lab_ID_SPT (unitless)
Lab_ID_LPT (unitless)
depth (Sample_depth, m)
Sample_Depth_Flag (unitless)
Th_232_SPT_CONC_PUMP_lpmi1m (picomoles per kilogram (pmol/kg))
SD1_Th_232_SPT_CONC_PUMP_lpmi1m (picomoles per kilogram (pmol/kg))
Flag_Th_232_SPT_CONC_PUMP_lpmi1m (unitless)
Th_230_SPT_CONC_PUMP_29jynq (micro-Becquerel per kilogram (uBq/kg))
... (38 more variables)


[GP15 Pb and Pb Isotopes Leg 1] - Lead (Pb) concentrations and Pb isotope ratios (206Pb/207Pb, 208Pb/207Pb, 206Pb/204Pb) from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
During September 23 to November 22, 2018, the R/V Roger Revelle completed a trace element (and their isotopes) hydrographic section along ~152° West from 56° North to 20° South (GEOTRACES GP15). Full water column trace metal clean samples were obtained with the U.S. GEOTRACES Carousel (GTC) composed of 24 12-liter trace metal clean GO-Flow sampling systems mounted on a trace metal free powder-coated titanium rosette system. Three of the stations had lead (Pb) concentrations determined at Massachusetts Institute of Technology (MIT) by isotope dilution quadrupole inductively coupled plasma mass spectrometry (ICPMS) for intercalibration with the Texas A&M (TAMU) lab of Jessica Fitzsimmons who analyzed all of the cruise stations. The rest of the full- and super-stations were analyzed at MIT for Pb isotope ratios (206Pb/207Pb, 208Pb/207Pb, 206Pb/204Pb). These data are collected to document the penetration of atmosphericly-transported anthropogenic Pb into the ocean and its subsequent dispersion by circulation and chemical interactions between sinking particles and Pb dissolved in solution. Shuo Jiang, Nathan Lanning, and Edward Boyle performed the extractions and the ICPMS analyses. This dataset includes data from Leg 1 of the cruise, RR1814.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Sample_ID (unitless)
depth (Sample_depth, m)
Pb_206_207_D_RATIO_BOTTLE_h0hu59 (unitless)
SD2_Pb_206_207_D_RATIO_BOTTLE_h0hu59 (unitless)
Flag_Pb_206_207_D_RATIO_BOTTLE_h0hu59 (unitless)
Pb_208_207_D_RATIO_BOTTLE_o5msvl (unitless)
SD1_Pb_208_207_D_RATIO_BOTTLE_o5msvl (unitless)
Flag_Pb_208_207_D_RATIO_BOTTLE_o5msvl (unitless)
... (18 more variables)


[GP15 Pb and Pb Isotopes Leg 2] - Lead (Pb) concentrations and Pb isotope ratios (206Pb/207Pb, 208Pb/207Pb, 206Pb/204Pb) from Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
During September 23 to November 22, 2018, the R/V Roger Revelle completed a trace element (and their isotopes) hydrographic section along ~152° West from 56° North to 20° South (GEOTRACES GP15). Full water column trace metal clean samples were obtained with the U.S. GEOTRACES Carousel (GTC) composed of 24 12-liter trace metal clean GO-Flow sampling systems mounted on a trace metal free powder-coated titanium rosette system. Three of the stations had lead (Pb) concentrations determined at Massachusetts Institute of Technology (MIT) by isotope dilution quadrupole inductively coupled plasma mass spectrometry (ICPMS) for intercalibration with the Texas A&M (TAMU) lab of Jessica Fitzsimmons who analyzed all of the cruise stations. The rest of the full- and super-stations were analyzed at MIT for Pb isotope ratios (206Pb/207Pb, 208Pb/207Pb, 206Pb/204Pb). These data are collected to document the penetration of atmosphericly-transported anthropogenic Pb into the ocean and its subsequent dispersion by circulation and chemical interactions between sinking particles and Pb dissolved in solution. Shuo Jiang, Nathan Lanning, and Edward Boyle performed the extractions and the ICPMS analyses. This dataset includes data from Leg 2 of the cruise, RR1815.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Sample_ID (unitless)
depth (Sample_depth, m)
Pb_208_207_D_RATIO_FISH_dx6trs (unitless)
SD1_Pb_208_207_D_RATIO_FISH_dx6trs (unitless)
Flag_Pb_208_207_D_RATIO_FISH_dx6trs (unitless)
Pb_206_204_D_RATIO_FISH_xqphwk (unitless)
SD1_Pb_206_204_D_RATIO_FISH_xqphwk (unitless)
Flag_Pb_206_204_D_RATIO_FISH_xqphwk (unitless)
... (18 more variables)


[GP15 Water Column Dissolved 227Ac Leg 1] - Activity of actinium-227 from water samples collected on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
Actinium-227 (227Ac) was captured on commercial water filters impregnated with manganese dioxide (MnO2) and placed downstream of the filters in submersible pumps deployed on GEOTRACES expedition GP15, aboard R/V Roger Revelle, in collaboration with groups from Woods Hole Oceanographic Institution (WHOI) and University of South Carolina who measured radium isotopes on the same cartridges. The activity of 227Ac was measured using RaDeCC (Radium Delayed Coincidence Counter) and used to calculate the concentration of dissolved  227Ac along the transect by PI Douglas Hammond and graduate student Nathan Kemnitz. Data have been summarized and will be submitted in a publication to be submitted to JGR Oceans, along with a companion data set for 227Ac, 228Ra, and 210Pb in sediments. This dataset has been used to evaluate deep ocean solute transport. This dataset includes data from Leg 1 of the cruise (RR1814). Leg 2 data (RR1815) are available in a separate BCO-DMO dataset.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
Gear_ID (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Sample_ID (unitless)
depth (Sample_depth, m)
Ac_227_D_CONC_PUMP_lfvbby (micro becquerel per kilogram (uBq/kg))
SD1_Ac_227_D_CONC_PUMP_lfvbby (micro becquerel per kilogram (uBq/kg))
Flag_Ac_227_D_CONC_PUMP_lfvbby (unitless)
Pa231_uBq_kg (micro becquerel per kilogram (uBq/kg))
... (9 more variables)


[GP15 Water Column Dissolved 227Ac Leg 2] - Activity of actinium-227 from water samples collected on Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018 (US GEOTRACES Pacific Meridional Transect (GP15))

Summary:
Actinium-227 (227Ac) was captured on commercial water filters impregnated with manganese dioxide (MnO2) and placed downstream of the filters in submersible pumps deployed on GEOTRACES expedition GP15, aboard R/V Roger Revelle, in collaboration with groups from Woods Hole Oceanographic Institution (WHOI) and University of South Carolina who measured radium isotopes on the same cartridges. The activity of 227Ac was measured using RaDeCC (Radium Delayed Coincidence Counter) and used to calculate the concentration of dissolved  227Ac along the transect by PI Douglas Hammond and graduate student Nathan Kemnitz. Data have been summarized and will be submitted in a publication to be submitted to JGR Oceans, along with a companion data set for 227Ac, 228Ra, and 210Pb in sediments. This dataset has been used to evaluate deep ocean solute transport. This dataset includes data from Leg 2 of the cruise (RR1815). Leg 1 data (RR1814) are available in a separate BCO-DMO dataset.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
Gear_ID (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
latitude (Start_latitude, degrees_north)
longitude (Start_longitude, degrees_east)
Sample_ID (unitless)
depth (Sample_depth, m)
Ac_227_D_CONC_PUMP_rxwrrl (micro becquerel per kilogram (uBq/kg))
SD1_Ac_227_D_CONC_PUMP_rxwrrl (micro becquerel per kilogram (uBq/kg))
Flag_Ac_227_D_CONC_PUMP_rxwrrl (unitless)
Pa231_uBq_kg (micro becquerel per kilogram (uBq/kg))
... (9 more variables)


[GP16 Acetic Acid Leachable Trace Metals from Aerosols] - Acetic acid leachable trace metals from bulk aerosol samples collected during the US GEOTRACES EPZT section cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical Pacific from October to December 2013 (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Atmospheric input is important to the biogeochemical cycling of trace metals in the ocean. The fraction of aerosol trace metals that can potentially dissolve after deposition is of interest for improving knowledge of aerosol/surface ocean interactions. This dataset provides acetic acid leachable trace metal values from bulk aerosol from the Equatorial Pacific along the US GEOTRACES EPTZ transect (TN303) from Peru to Tahiti. This region is characterized as one of the lowest atmospheric deposition regimes in the ocean. Bulk aerosols were collected from the boundary layer (~15 m above sea level) using a high-volume aerosol sampler drawing approximately 1.2 cubic meters of air per minute over Whatman 41 ash-less filter discs. Despite low aerosol loadings, triplicate agreement for most samples was good for Al, Ti, V, Mn, Fe, and Cu. Away from the coast, Cd and Pb values in most samples were close to, or below detection limit. Acetic acid leaches were carried out with a combination of 25% acetic acid and a reducing agent. Leachable trace metal concentrations were determined at the University of Alaska Fairbanks by inductively coupled plasma mass spectrometry (Thermo Element-2) using external calibration curves. The aerosol trace metal fractional solubility was calculated as a percent of the total bulk aerosol data from the same cruise (https://www.bco-dmo.org/dataset/675632).

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (End ISO Date Time UTC, unitless)
latitude (degrees_north)
longitude (degrees_east)
End_Latitude (Latitude, degrees North)
End_Longitude (Longitude, degrees East)
Event_ID (unitless)
Sample_ID (unitless)
... (26 more variables)


[GP16 Cast Events Summary Table] - Cast events summary table associated with the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Cast events summary table associated with the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013.

cdm_data_type = Other
VARIABLES:
EXPOCODE (text)
SECT_ID (text)
GEOTRC_EVENTNO (dimensionless)
STNNBR (dimensionless)
CASTNO (dimensionless)
CAST_TYPE (text)
DATE (unitless)
time2 (TIME, unitless)
time (ISO DATE TIME, seconds since 1970-01-01T00:00:00Z)
EVENT_CODE (text)
latitude (degrees_north)
longitude (degrees_east)
NAV (text)
CORR_DEPTH (meters)
HT_ABOVE_BOTTOM (meters)
WIRE_OUT (meters)
MAX_PRESS (dbar)
NO_BOTTLES (dimensionless)
PARAMETERS (text)
COMMENTS (text)


[GP16 CFC Sat] - CFC saturation along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
CFC saturation along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013.

cdm_data_type = Other
VARIABLES:
EXPOCODE (text)
SECT_ID (text)
GEOTRC_EVENTNO (dimensionless)
Station (dimensionless)
Sample_Num (dimensionless)
GEOTRC_SAMPNO (dimensionless)
DATE (unitless)
time2 (TIME, HHMM)
time (ISO DATETIME, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
pressure (decibars)
salinity (Sea Water Practical Salinity, PSS-78)
theta ((tbd))
f11spc ((tbd))
f12spc ((tbd))
f113spc ((tbd))
ccl4spc ((tbd))
sf6spc ((tbd))


[GP16 Cruise Event Log] - Scientific sampling event log associated with the US GEOTRACES East Pacific Zonal Transect cruise from R/V Thomas G. Thompson TN303 in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Scientific Sampling Event Log for TN303 (GEOTRACES EPZT). Station numbers, Events, Dates/Times, Lat/Lons and Event descriptions are provided for each station.

cdm_data_type = Other
VARIABLES:
GEOTRC_EVENTNO (integer)
LOCATION (text)
DATE_START (unitless)
TIME_START (unitless)
time (ISO DATETIME START, seconds since 1970-01-01T00:00:00Z)
DATE_END (unitless)
TIME_END (unitless)
ISO_DATETIME_END (unitless)
latitude (degrees_north)
longitude (degrees_east)
LAT_DEG_S (Latitude, degrees)
LAT_MIN_S (Latitude, dec_mins)
LON_DEG_W (degrees)
LON_MIN_W (dec_mins)
DEPTH_MIN (Depth, meters)
depth (m)
EVENT_DESCRIPTION (text)
SAMPLES_TAKEN (text)
GEOTRACES_ID_NUMBER_RANGE (text)
COMMENT (text)


[GP16 Cruise Track] - Cruise track along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Cruise track along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013.

cdm_data_type = Other
VARIABLES:
CruiseId (Cruise Id, text)
time (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
SOG (Speed Over Ground, meters/sec)
COG (Course Over Ground, decimal degrees)


[GP16 CTD - GT-C Bottle] - GTC bottle data along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
GTC bottle data along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013.

cdm_data_type = Other
VARIABLES:
EXPOCODE (text)
SECT_ID (text)
STNNBR (dimensionless)
CASTNO (dimensionless)
GEOTRC_EVENTNO (dimensionless)
DATE (unitless)
time2 (TIME, unitless)
ISO_DATETIME (unitless)
latitude (degrees_north)
longitude (degrees_east)
GEOTRC_SAMPNO (dimensionless)
SAMPNO (dimensionless)
BTLNBR (text)
BTLNBR_FLAG_W (dimensionless)
BTL_DATE (unitless)
BTL_TIME (unitless)
time (BTL ISO DATETIME, seconds since 1970-01-01T00:00:00Z)
BTL_LAT (decimal degrees)
BTL_LON (decimal degrees)
ODF_CTDPRS (DBARS)
S_M_DEPTH (METERS)
F_M_DEPTH (METERS)
BTMDEPTH (CORR_M)
CTDPRS (DBARS)
CTDDEPTH (METERS)
CTDTMP (degrees celsius)
... (416 more variables)


[GP16 CTD - GT-C DownCasts] - GTC CTD down casts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
GTC CTD down casts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013.

cdm_data_type = Other
VARIABLES:
DATASET_ID (text)
EXPOCODE (text)
SECT_ID (text)
GEOTRC_EVENTNO (dimensionless)
STNNBR (dimensionless)
CASTNO (dimensionless)
DATE (unitless)
time2 (TIME, HHMM)
time (ISO DATE TIME, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
BTMDEPTH (meters)
INSTRUMENT_ID (dimensionless)
CTDPRS (DBARS)
CTDPRS_FLAG_W (dimensionless)
CTDTMP (degrees celsius)
CTDTMP_FLAG_W (dimensionless)
CTDSAL (PSS-78)
CTDSAL_FLAG_W (dimensionless)
CTDOXY (UMOL/KG)
CTDOXY_FLAG_W (dimensionless)
TRANSM (volts)
TRANSM_FLAG_W (dimensionless)
FLUORM (volts)
FLUORM_FLAG_W (dimensionless)
TURBDTY (volts)
... (7 more variables)


[GP16 CTD - ODF Bottle] - ODF bottle data along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
ODF bottle data along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013.

cdm_data_type = Other
VARIABLES:
EXPOCODE (text)
SECT_ID (text)
STNNBR (dimensionless)
CASTNO (dimensionless)
GEOTRC_EVENTNO (dimensionless)
DATE (unitless)
time2 (TIME, HHMM)
time (ISO DATETIME, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
GEOTRC_SAMPNO (dimensionless)
SAMPNO (dimensionless)
BTLNBR (text)
BTLNBR_FLAG_W (dimensionless)
BTL_DATE (unitless)
BTL_TIME (HHMM)
BTL_ISO_DATETIME (unitless)
BTL_LAT (decimal degrees)
BTL_LON (decimal degrees)
ODF_CTDPRS (DBARS)
SMDEPTH (METERS)
FMDEPTH (METERS)
BTMDEPTH (CORR_M)
CTDPRS (DBARS)
CTDDEPTH (METERS)
CTDTMP (degrees celsius)
... (392 more variables)


[GP16 CTD - ODF DownCasts] - ODF CTD down casts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
ODF CTD down casts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013.

cdm_data_type = Other
VARIABLES:
DATASET_ID (text)
EXPOCODE (text)
SECT_ID (text)
GEOTRC_EVENTNO (dimensionless)
STNNBR (dimensionless)
CASTNO (dimensionless)
DATE (unitless)
time2 (TIME, HHMM)
time (ISO DATE TIME, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
BTMDEPTH (meters)
INSTRUMENT_ID (dimensionless)
CTDPRS (DBARS)
CTDPRS_FLAG_W (dimensionless)
CTDTMP (degrees celsius)
CTDTMP_FLAG_W (dimensionless)
CTDSAL (PSS-78)
CTDSAL_FLAG_W (dimensionless)
CTDOXY (UMOL/KG)
CTDOXY_FLAG_W (dimensionless)
TRANSM (volts)
TRANSM_FLAG_W (dimensionless)
FLUORM (volts)
FLUORM_FLAG_W (dimensionless)
TURBDTY (volts)
... (9 more variables)


[GP16 d13C-DIC] - The 13C/12C stable carbon isotopic ratio of the dissolved inorganic carbon from samples collected on the GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical South Pacific from October to December 2013 (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
The 13C/12C stable carbon isotopic ratio of the dissolved inorganic carbon from samples collected on the GEOTRACES EPZT cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical South Pacific from October to December 2013.

cdm_data_type = Other
VARIABLES:
cruise_id (unitless)
EXPOCODE (unitless)
GEOTRC_INSTR (unitless)
STNNBR (unitless)
GEOTRC_SAMPNO (unitless)
GEOTRC_EVENTNO (unitless)
CASTNO (unitless)
DIC_13_D_DELTA_BOTTLE (per mil)
DIC_13_D_DELTA_BOTTLE_FLAG (unitless)
SAMPNO (unitless)
BTLNBR (unitless)
BTLNBR_FLAG_W (unitless)
ISO_DATETIME_UTC_START_EVENT (unitless)
latitude (EVENT LAT, degrees_north)
longitude (degrees_east)
time (BTL ISO DATETIME UTC, seconds since 1970-01-01T00:00:00Z)
BTL_LAT (decimal degrees)
BTL_LON (decimal degrees)
depth (CTDDEPTH, m)


[GP16 d15N NO3] - Nitrate isotope data from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Nitrate isotope data from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project).

cdm_data_type = Other
VARIABLES:
cruise_id (unitless)
STNNBR (unitless)
GEOTRC_EVENTNO (unitless)
CASTNO (unitless)
ISO_DATETIME_UTC_START_EVENT (unitless)
latitude (EVENT LAT, degrees_north)
longitude (degrees_east)
GEOTRC_INSTR (unitless)
GEOTRC_SAMPNO (unitless)
depth (m)
NO3_15_D_DELTA_BOTTLE (Mole Concentration Of Nitrate In Sea Water, permil)
NO3_15_D_DELTA_BOTTLE_STDEV (Mole Concentration Of Nitrate In Sea Water, permil)
num_of_analyses (dimensionless)
NO3_15_D_DELTA_BOTTLE_FLAG (dimensionless)
SAMPNO (unitless)
BTLNBR (unitless)
BTLNBR_FLAG_W (unitless)
time (BTL ISO DATETIME UTC, seconds since 1970-01-01T00:00:00Z)
BTL_LAT (decimal degrees)
BTL_LON (decimal degrees)
ODF_CTDPRS (decibars)
SMDEPTH (meters)
FMDEPTH (meters)
BTMDEPTH (meters)
CTDPRS (decibars)
CTDDEPTH (meters)


[GP16 Dissolved iron speciation] - Dissolved iron speciation from 2013 U.S. GEOTRACES Eastern Pacific Zonal Transect from R/V Thomas G. Thompson TN303 from October-December 2013 (U.S. GEOTRACES EPZT project, EPZT Fe Cu Co project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Dissolved iron-binding organic ligand concentrations and conditional stability
constants from surface GeoFish and GO-FLO water column samples collected in
2013 during the U.S. GEOTRACES GP16 cruise in the Eastern Pacific between Peru
and Tahiti on the R.V. Thomas G. Thompson, \u00a0cruise TN303.

The FISH and BOTTLE data have been split into separate columns as per
GEOTRACES Parameter Naming Conventions.The FISH data are to the far right.

* To access the data with the FISH and BOTTLE data merged, see:\u00a0[http://data.bco-dmo.org/jg/serv/BCO/GEOTRACES/EPZT/Fe_spec_EPZT_joined.html0%7Bdir=data.bco-dmo.org/jg/dir/BCO/GEOTRACES/EPZT/,info=data.bco-dmo.org/jg/info/BCO/GEOTRACES/EPZT/Fe_speciation%7D](\\http://data.bco-dmo.org/jg/serv/BCO/GEOTRACES/EPZT/Fe_spec_EPZT_joined.html0%7Bdir=data.bco-dmo.org/jg/dir/BCO/GEOTRACES/EPZT/,info=data.bco-dmo.org/jg/info/BCO/GEOTRACES/EPZT/Fe_speciation%7D\\)

cdm_data_type = Other
VARIABLES:
cruise_id (unitless)
station (unitless)
GEOTRC_SAMPNO (unitless)
latitude (degrees_north)
longitude (degrees_east)
depth (m)
Fe_D_CONC_BOTTLE (nanomoles/liter (10^-9 M))
L1Fe_D_CONC_BOTTLE (L1 Fe D CONC BOTTLE, nanomoles/liter (10^-9 M))
L1_FLAG (unitless)
L1_95pcnt_CI (nanomoles/liter (10^-9 M))
L1Fe_D_LogK_BOTTLE (L1 Fe D Log K BOTTLE, No units; K1 has units of M-1)
log_K1_FLAG (unitless)
log_K1_95pcnt_CI (No units; K1 has units of M-1)
L2Fe_D_CONC_BOTTLE (L2 Fe D CONC BOTTLE, nanomoles/liter (10^-9 M))
L2_FLAG (unitless)
L2_95pcnt_CI (nanomoles/liter (10^-9 M))
L2Fe_D_LogK_BOTTLE (L2 Fe D Log K BOTTLE, No units; K2 has units of M^-1)
log_K2_FLAG (unitless)
... (29 more variables)


[GP16 Dissolved Nd Isotopes and REEs - LDEO] - Dissolved neodymium (Nd) isotopes and concentrations of rare-earth elements (REEs) reported by LDEO in seawater samples collected during the GEOTRACES GP16 East Pacific Zonal Transect cruise (TN303) on R/V Thomas G. Thompson from October to December 2013 (U.S. GEOTRACES East Pacific Zonal Transect (GP16))

Summary:
This dataset includes dissolved neodymium (Nd) isotopes and concentrations of rare earth elements (REEs) in seawater samples collected along the GEOTRACES GP16 East Pacific Zonal Transect. The cruise was aboard the R/V Thomas G. Thompson between October 25 and December 20, 2013 from Manta, Ecuador to Papeete, Tahiti. Multicollector-inductively coupled plasma-mass spectrometry (MC-ICP-MS) was used to analyze Nd isotopes and quadrupole ICP‐MS was used to analyze REE concentrations.

This cruise provides a great opportunity to understand sources, sinks, and cycling of REEs in the ocean as well as how well Nd isotopes behave as a conservative water mass tracer. The data were collected by Yingzhe Wu and Chandranath Basak at Lamont-Doherty Earth Observatory of Columbia University.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
time (Iso_datetime_utc_start, seconds since 1970-01-01T00:00:00Z)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
Start_Latitude (degrees_north)
longitude (Start_longitude, degrees_east)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample_depth, m)
CTDPRS_T_VALUE_SENSOR_vvdwtp (decibars (dbar))
SD1_CTDPRS_T_VALUE_SENSOR_vvdwtp (decibars (dbar))
Flag_CTDPRS_T_VALUE_SENSOR_vvdwtp (unitless)
CTDTMP_T_VALUE_SENSOR_fp7gnu (degrees Celsius)
SD1_CTDTMP_T_VALUE_SENSOR_fp7gnu (degrees Celsius)
Flag_CTDTMP_T_VALUE_SENSOR_fp7gnu (unitless)
CTDSAL_D_CONC_SENSOR_dipxfj (PSU?)
SD1_CTDSAL_D_CONC_SENSOR_dipxfj (PSU?)
Flag_CTDSAL_D_CONC_SENSOR_dipxfj (unitless)
... (102 more variables)


[GP16 Dissolved REEs] - Dissolved REE concentrations and Nd isotopes from the GEOTRACES EPZT R/V Thomas G. Thompson cruise TN303 from November to December 2013 (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Dissolved REE concentrations and Nd isotopes from the GEOTRACES EPZT R/V Thomas G. Thompson cruise TN303 from November to December 2013.

cdm_data_type = Other
VARIABLES:
Cruise (unitless)
Station (unitless)
GEOTRC_SAMPNO (unitless)
depth (m)
Sampling_Device (unitless)
Year (unitless)
time (Date Time, seconds since 1970-01-01T00:00:00Z)
longitude (degrees_east)
latitude (degrees_north)
La_D_CONC_BOTTLE (picomoles per kilogram (pmol/kg))
La_D_CONC_BOTTLE_QV_IODE (unitless)
Ce_D_CONC_BOTTLE (pmol/kg)
Ce_D_CONC_BOTTLE_QV_IODE (unitless)
Pr_D_CONC_BOTTLE (pmol/kg)
Pr_D_CONC_BOTTLE_QV_IODE (unitless)
Nd_D_CONC_BOTTLE (pmol/kg)
Nd_D_CONC_BOTTLE_QV_IODE (unitless)
Sm_D_CONC_BOTTLE (pmol/kg)
Sm_D_CONC_BOTTLE_QV_IODE (unitless)
Eu_D_CONC_BOTTLE (pmol/kg)
Eu_D_CONC_BOTTLE_QV_IODE (unitless)
Gd_D_CONC_BOTTLE (pmol/kg)
Gd_D_CONC_BOTTLE_QV_IODE (unitless)
Tb_D_CONC_BOTTLE (pmol/kg)
Tb_D_CONC_BOTTLE_QV_IODE (unitless)
Dy_D_CONC_BOTTLE (pmol/kg)
... (45 more variables)


[GP16 Elemental selenium and particulate Acid-Volatile Sulfide] - Particulate Acid-Volatile Sulfide (pAVS) and elemental selenium (pSe) concentrations from a McLane pump collected during the R/V Thomas G. Thompson cruise TN303 from Peru to Tahiti in 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Particulate Acid-Volatile Sulfide (pAVS) and elemental selenium (pSe) concentrations from a McLane pump collected during the R/V Thomas G. Thompson cruise TN303 from Peru to Tahiti in 2013.

cdm_data_type = Other
VARIABLES:
cruise_id (unitless)
EXPOCODE (unitless)
SECT_ID (unitless)
GEOTRC_INSTR (unitless)
STNNBR (unitless)
CASTNO (unitless)
GEOTRC_EVENTNO (unitless)
DATE_START_EVENT (unitless)
TIME_START_EVENT (unitless)
time (ISO DATETIME UTC START EVENT, seconds since 1970-01-01T00:00:00Z)
latitude (EVENT LAT, degrees_north)
longitude (degrees_east)
DEPTH_MIN (Depth, meters)
DEPTH_MAX (Depth, meters)
GEOTRC_SAMPNO (unitless)
SAMPNO (unitless)
depth (m)
AVS_TP_CONC_PUMP (picomoles per liter)
Se_0_TP_CONC_PUMP (nanomoles per liter)


[GP16 GeoFish - Nuts and Sals] - GeoFish nutrients and salts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
GeoFish nutrients and salts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013.

cdm_data_type = Other
VARIABLES:
EXPOCODE (text)
SECT_ID (text)
GEOTRC_EVENTNO (dimensionless)
Station (dimensionless)
GEOTRC_SAMPNO (dimensionless)
DATE (unitless)
time2 (TIME, HHMM)
time (ISO DATETIME, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
NO3 (Mole Concentration Of Nitrate In Sea Water, umol/L)
PO4 (Mass Concentration Of Phosphate In Sea Water, umol/L)
SIL (umol/L)
NO2 (Mole Concentration Of Nitrite In Sea Water, umol/L)
Salinity (Sea Water Practical Salinity, PSS-78)


[GP16 N2O Isotopes and Concentrations] - Nitrous oxide (N2O) isotopes and concentrations from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific from October to December 2013 (U.S. GEOTRACES East Pacific Zonal Transect (GP16))

Summary:
This dataset includes nitrous oxide (N2O) isotopes and concentration measurements with accompanying physiochemical data from the 2013 U.S. GEOTRACES East Pacific Zonal Transect cruise (GP16). The cruise sailed from October 25, 2013 to December 18, 2023 aboard the R/V Thompson.

cdm_data_type = Other
VARIABLES:
STNNBR (unitless)
GEOTRC_EVENTNO (unitless)
GEOTRC_SAMPNO (unitless)
DATE (unitless)
latitude (degrees_north)
longitude (degrees_east)
CTDPRS (decibars)
depth (m)
CTDTMP (degrees Celsius)
CTDSAL (PSU)
N2O_ALPHA_15_14_D_DELTA_BOTTLE_mmz7wk (permille)
SD1_N2O_ALPHA_15_14_D_DELTA_BOTTLE_mmz7wk (permille)
N2O_BETA_15_14_D_DELTA_BOTTLE (permille)
SD1_N2O_BETA_15_14_D_DELTA_BOTTLE (permille)
N2O_SP_15_14_D_DELTA_BOTTLE (permille)
SD1_N2O_SP_15_14_D_DELTA_BOTTLE (permille)
N2O_15_14_D_DELTA_BOTTLE_f2vswm (permille)
SD1_N2O_15_14_D_DELTA_BOTTLE_f2vswm (permille)
N2O_17_16_D_DELTA_BOTTLE (permille)
SD1_N2O_17_16_D_DELTA_BOTTLE (permille)
N2O_18_16_D_DELTA_BOTTLE_xkal8d (permille)
SD1_N2O_18_16_D_DELTA_BOTTLE_xkal8d (permille)
N2O_D_CONC_BOTTLE_ahlf1q (nanomolar (nmol/L))
SD1_N2O_D_CONC_BOTTLE_ahlf1q (nanomolar (nmol/L))
N2O_Flag (unitless)
... (6 more variables)


[GP16 Nitrite Isotopes and Concentrations] - Nitrite (NO2-) isotopes and concentrations from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific from October to December 2013 (U.S. GEOTRACES East Pacific Zonal Transect (GP16))

Summary:
This dataset includes nitrite (NO2-) isotopes and concentration measurements with accompanying physiochemical data from the 2013 U.S. GEOTRACES East Pacific Zonal Transect cruise (GP16). The cruise sailed from October 25, 2013 to December 18, 2023 aboard the R/V Thompson.

cdm_data_type = Other
VARIABLES:
STNNBR (unitless)
GEOTRC_EVENTNO (unitless)
GEOTRC_SAMPNO (unitless)
DATE (unitless)
latitude (degrees_north)
longitude (degrees_east)
CTDPRS (decibars)
depth (m)
CTDTMP (degrees Celsius)
CTDSAL (PSU)
NITRITE (micromoles per liter (umol/L))
NITRITE_15_14_D_DELTA_BOTTLE_x5fmqg (permille)
SD1_NITRITE_15_14_D_DELTA_BOTTLE_x5fmqg (permille)
Flag_NITRITE_15_14_D_DELTA_BOTTLE_x5fmqg (unitless)
NITRITE_18_16_D_DELTA_BOTTLE_iqunnm (permille)
SD1_NITRITE_18_16_D_DELTA_BOTTLE_iqunnm (permille)
Flag_NITRITE_18_16_D_DELTA_BOTTLE_iqunnm (unitless)


[GP16 Particle Composition] - Size-fractionated major and minor particle composition and concentration collected from RV Thompson (TN303) along the US GEOTRACES EPZT transect in the Eastern Tropical Pacific during 2013 (US GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Size-fractionated major and minor particle composition and concentration collected from RV Thompson (TN303) along the US GEOTRACES EPZT transect in the Eastern Tropical Pacific during 2013 (US GEOTRACES EPZT project)

cdm_data_type = Other
VARIABLES:
cruise_id (unitless)
STNNBR (unitless)
GEOTRC_SAMPNO (unitless)
GEOTRC_EVENTNO (unitless)
time (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
CASTNO (unitless)
latitude (degrees_north)
longitude (PUMP LON, degrees_east)
BTMDEPTH (meters)
DEPTH_MAX (Depth, meters)
sliters (liters)
Y_SPT_CONC_PUMP (picomole per liter)
Mo_SPT_CONC_PUMP (picomole per liter)
Ag_SPT_CONC_PUMP (picomole per liter)
Cd_SPT_CONC_PUMP (picomole per liter)
Ba_SPT_CONC_PUMP (picomole per liter)
Nd_SPT_CONC_PUMP (picomole per liter)
Pb_SPT_CONC_PUMP (picomole per liter)
Th_SPT_CONC_PUMP (picomole per liter)
Al_SPT_CONC_PUMP (picomole per liter)
P_SPT_CONC_PUMP (picomole per liter)
Sc_SPT_CONC_PUMP (picomole per liter)
Ti_SPT_CONC_PUMP (picomole per liter)
V_SPT_CONC_PUMP (picomole per liter)
Mn_SPT_CONC_PUMP (picomole per liter)
... (169 more variables)


[GP16 Polonium-210 and Lead-210 dissolved] - Dissolved Po-210 and Pb-210 from GEOTRACES-EZPT cruise TN303, 2013 (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Dissolved Po-210 and Pb-210 in six vertical profiles from super stations of EPZT of US GEOTRACES cruise on RV Thompson cruise 303. Dissolved Po-210 and Pb-210, dissolved: \u2264 0.45 mm; units: disintegration per minute (dpm) / 100 L of water.

cdm_data_type = Other
VARIABLES:
cruise_id (unitless)
STNNBR (unitless)
GEOTRC_SAMPNO (unitless)
depth_PI (Depth, meters)
depth (CTDDEPTH, m)
latitude (BTL LAT, degrees_north)
longitude (BTL LON, degrees_east)
CASTNO (unitless)
GEOTRC_EVENTNO (unitless)
SAMPNO (unitless)
BTLNBR (unitless)
BTLNBR_FLAG_W (unitless)
ISO_DATETIME_UTC_START_EVENT (unitless)
time (BTL ISO DATETIME UTC, seconds since 1970-01-01T00:00:00Z)
vol_sample (kg)
Po_210_D_CONC_BOTTLE (210Po  dpm 100L-1)
Po_210_D_CONC_BOTTLE_sd (210Po  dpm 100L-1)
Po_210_D_CONC_BOTTLE_flag (unitless)
Pb_210_D_CONC_BOTTLE (210Pb  dpm 100L-1)
Pb_210_D_CONC_BOTTLE_sd (210Pb  dpm 100L-1)
Pb_210_D_CONC_BOTTLE_flag (unitless)
Po_210_Pb_210_D_RATIO_BOTTLE (unitless)
Po_210_Pb_210_D_RATIO_BOTTLE_sd (unitless)
Po_210_D_CONC_FISH (210Po  dpm 100L-1)
Po_210_D_CONC_FISH_sd (210Po  dpm 100L-1)
... (6 more variables)


[GP16 PUMPs - Nuts and Sals] - Pump nutrients and salts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Pump nutrients and salts along the US GEOTRACES East Pacific Zonal Transect from the R/V Thomas G. Thompson TN303 cruise in the tropical Pacific from Peru to Tahiti during 2013.

cdm_data_type = Other
VARIABLES:
EXPOCODE (text)
SECT_ID (text)
GEOTRC_EVENTNO (dimensionless)
Station (dimensionless)
GEOTRC_SAMPNO (dimensionless)
Pump_SampleNo (Pump Sample No, dimensionless)
DATE (unitless)
time2 (TIME, HHMM)
time (ISO DATETIME, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
NO3 (Mole Concentration Of Nitrate In Sea Water, umol/L)
PO4 (Mass Concentration Of Phosphate In Sea Water, umol/L)
SIL (umol/L)
NO2 (Mole Concentration Of Nitrite In Sea Water, umol/L)
Salinity (Sea Water Practical Salinity, PSS-78)


[GP16 Soluble and Dissolved Fe and Fe Isotopes] - Concentrations of soluble and dissolved iron (Fe) and iron isotope ratios from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific during November & December 2013 (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Concentrations of soluble and dissolved iron (Fe) and iron isotope ratios from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific during November & December 2013.

cdm_data_type = Other
VARIABLES:
cruise (unitless)
station_no (unitless)
cast_no (unitless)
event_no (unitless)
geotraces_no (unitless)
date (unitless)
time2 (Time, unitless)
time (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
depth (Ctd Depth, m)
dFe_conc (D Fe Conc, nanomoles per kilogram (nmol kg-1))
dFe_conc_error (D Fe Conc Error, nanomoles per kilogram (nmol kg-1))
dFe_conc_flag (D Fe Conc Flag, unitless)
sFe_conc (S Fe Conc, nanomoles per kilogram (nmol kg-1))
sFe_conc_error (S Fe Conc Error, nanomoles per kilogram (nmol kg-1))
sFe_conc_flag (S Fe Conc Flag, unitless)
delta_56_dFe (Delta 56 D Fe, per mil (‰))
delta_56_dFe_error (Delta 56 D Fe Error, per mil (‰))
delta_56_dFe_flag (Delta 56 D Fe Flag, unitless)
delta_56_sFe (Delta 56 S Fe, per mil (‰))
delta_56_sFe_error (Delta 56 S Fe Error, per mil (‰))
delta_56_sFe_flag (Delta 56 S Fe Flag, unitless)


[GP16 Thorium-234 Particulate] - Particulate Th-234 from in-situ pumps, including large size fraction (> 51 um) and small size fraction (1-51 um), from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Particulate Thorium-234 from in-situ pumps, including large size fraction (> 51 \u00b5m) and small size fraction (1-51 \u00b5m), during the 2013 U.S. GEOTRACES cruise.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (End ISO Date Time UTC, unitless)
latitude (degrees_north)
longitude (degrees_east)
End_Latitude (Latitude, decimal degrees North)
End_Longitude (Longitude, decimal degrees East)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample Depth, m)
Th_234_LPT_CONC_PUMP_byeecv (mBq/kg)
SD1_Th_234_LPT_CONC_PUMP_byeecv (mBq/kg)
Flag_Th_234_LPT_CONC_PUMP_byeecv (unitless)
Th_234_SPT_CONC_PUMP_bm10kg (mBq/kg)
SD1_Th_234_SPT_CONC_PUMP_bm10kg (mBq/kg)
Flag_Th_234_SPT_CONC_PUMP_bm10kg (unitless)


[GP16 Thorium-234 Total] - Water-column total Th-234 from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project) (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Water-column total Th-234 with 4 L method from the 2013 U.S. GEOTRACES EPZT cruise.\r\n\r\nU-238 from U-salinity relationship was also determined but not reported in this dataset. These data can be made available upon request from the PI and/or dataset contact. Methods are described below.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (End ISO Date Time UTC, unitless)
latitude (degrees_north)
longitude (degrees_east)
End_Latitude (Latitude, decimal degrees North)
End_Longitude (Longitude, decimal degrees East)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample Depth, m)
Th_234_T_CONC_BOTTLE_oepuv9 (mBq/kg)
SD1_Th_234_T_CONC_BOTTLE_oepuv9 (mBq/kg)
Flag_Th_234_T_CONC_BOTTLE_oepuv9 (None)
Th_234_T_CONC_UWAY_gy2zni (mBq/kg)
SD1_Th_234_T_CONC_UWAY_gy2zni (mBq/kg)
Flag_Th_234_T_CONC_UWAY_gy2zni (None)


[GP16 Total Particulate Aerosols] - Total particulate trace element concentrations from bulk aerosol samples collected during the US GEOTRACES EPZT section cruise (R/V Thomas G. Thompson TN303) in the Eastern Tropical Pacific from October to December 2013 (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Atmospheric input is important to the biogeochemical cycling of trace metals in the ocean. This dataset provides total particulate trace metal values from bulk aerosols over the Equatorial Pacific along the US GEOTRACES EPTZ transect (TN303) from Peru to Tahiti. This region is characterized as one of the lowest atmospheric deposition regimes in the ocean. Bulk aerosols were collected from the boundary layer (~15 m above sea level) using a high-volume aerosol sampler drawing approximately 1.2 cubic meters of air per minute over Whatman 41 ash-less filter discs. Despite low aerosol loadings, triplicate agreement for most samples was good for Al, Ti, V, Mn, Fe, and Cu. Away from the coast, Cd and Pb values in most samples were close to, or below detection limit. Total digestions were carried out with a combination of hydrochloric acid, nitric acid, hydrofluoric acid, heat, and pressure. Total particulate trace metal concentrations were determined at the University of Alaska Fairbanks by inductively coupled plasma mass spectrometry (Thermo Element-2) using external calibration curves.

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (End ISO Date Time UTC, unitless)
latitude (degrees_north)
longitude (degrees_east)
End_Latitude (Latitude, degrees North)
End_Longitude (Longitude, degrees East)
Event_ID (unitless)
Sample_ID (unitless)
depth (Sample Depth, m)
air_vol_total (cubic meters (m3))
Al_A_T_CONC_HIVOL_o1yvlu (nanograms per cubic meter (ng/m3))
... (23 more variables)


[GP16 Water Mass Percentages] - Results from Optimum Multiparameter Water Mass Analysis (OMPA) obtained using temperature, salinity, nutrient, and oxygen data from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific from October to December 2013 (U.S. GEOTRACES East Pacific Zonal Transect)

Summary:
Results from Optimum Multiparameter Water Mass Analysis (OMPA) obtained using temperature, salinity, nutrient, and oxygen data from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific from October to December 2013.

cdm_data_type = Other
VARIABLES:
cruise_id (unitless)
GEOTRC_INSTR (unitless)
STNNBR (unitless)
latitude (degrees_north)
longitude (degrees_east)
GEOTRC_SAMPNO (unitless)
GEOTRC_EVENTNO (unitless)
CASTNO (unitless)
CTDPRS (decibars (db))
depth (CTDDEPTH, m)
SAMPNO (unitless)
BTLNBR (unitless)
BTLNBR_FLAG_W (unitless)
time (BTL ISO DATETIME UTC, seconds since 1970-01-01T00:00:00Z)
BTL_LAT (decimal degrees)
BTL_LON (decimal degrees)
ESSW_PCT (percent (%))
ESSW_UNCT (percent (%))
ESSW_STN (dimensionless)
ESPIW_PCT (percent (%))
ESPIW_UNCT (percent (%))
ESPIW_STN (dimensionless)
SPCW_PCT (percent (%))
SPCW_UNCT (percent (%))
SPCW_STN (dimensionless)
... (19 more variables)


[GP17-ANT Event Log] - Scientific sampling event log from the US GEOTRACES GP17-ANT cruise in the Amundsen Sea on RVIB Nathaniel B. Palmer (NBP2401) from November 2023 to January 2024 (US GEOTRACES GP17 Section: Amundsen Sea Sector of the Antarctic Continental Margin (GP17-ANT))

Summary:
This dataset is the scientific sampling event log from the US GEOTRACES GP17-ANT cruise on RVIB Nathaniel B. Palmer (NBP2401). The U.S. GEOTRACES GP17-ANT expedition departed Punta Arenas, Chile on November 29th, 2023 and arrived in Lyttelton, New Zealand on January 28th, 2024. The cruise took place in the Amundsen Sea with a team of 35 scientists led by Peter Sedwick (Old Dominion University), Phoebe Lam (University of California, Santa Cruz), and Robert Sherrell (Rutgers University). GP17 was planned as a two-leg expedition, with its first leg (GP17-OCE) as a southward extension of the 2018 GP15 Alaska-Tahiti expedition and this second leg (GP17-ANT) into coastal and shelf waters of Antarctica's Amundsen Sea.

cdm_data_type = Other
VARIABLES:
Event_ID (unitless)
Sample_IDs (unitless)
Instrument (unitless)
Station (unitless)
Cast (unitless)
Start_Time (unitless)
ISO_DateTime_Start_UTC (unitless)
longitude (degrees_east)
latitude (Start_lat, degrees_north)
End_Time (unitless)
ISO_DateTime_End_UTC (unitless)
End_Lon (degrees_east)
End_Lat (degrees_north)
Author (unitless)
Notes (unitless)


[GP17-ANT Fe-binding humic-like substances] - Concentrations of iron bound to humic-like substances and total iron-binding capacity of humic-like substances from discrete samples collected on the GP17-ANT RVIB Palmer cruise NBP24-01 in the Amundsen Sea from Nov 2023 to Jan 2024 (Collaborative Research: U.S. GEOTRACES GP17-OCE and GP17-ANT: Characterizing iron-binding organic ligands in the Southern Ocean and implications for iron cycling in the global ocean)

Summary:
This dataset includes the concentrations of iron (Fe) bound to humic-like substances and total iron-binding capacity of humic-like substances from discrete depth profile and towfish samples collected on the GP17-ANT cruise NBP24-01 on the R/V IB Nathaniel B. Palmer in the Amundsen Sea from 29 November 2023 to 28 January 2024.

This project investigates the impact of Fe-binding humic-like substances on Fe biogeochemistry in the Amundsen Sea. The project used a combination of depth profile and surface towfish samples to characterize the contributions of humic-like substances to Fe biogeochemistry across gradients in primary production, water masses, and bathymetric features in the Amundsen Sea. Understanding the distributions of Fe-binding humic-like substances provides insight into the impact of compositional changes of the Fe-binding ligand pool on Fe biogeochemistry and may help elucidate specific sources of these ligands.

cdm_data_type = Other
VARIABLES:
CRUISE_ID (unitless)
SECT_ID (unitless)
STNNBR (unitless)
PLATFORM (unitless)
CASTNO (unitless)
SAMPNO (unitless)
EVENT_NO (unitless)
GEOTRC_SAMPNO (unitless)
BTLNBR (unitless)
DATE (unitless)
time_unitless (Time, unitless)
time (Iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
LATITUDE (degrees_north)
LONGITUDE (degrees_east)
DEPTH (meters (m))
CTDPRS (decibars (db))
... (14 more variables)


[GP17-ANT Fe-binding ligands] - Dissolved iron-binding ligand concentrations and conditional stability constants from field samples collected on US GEOTRACES GP17-ANT cruise NBP24-01 on RVIB Palmer in the Amundsen Sea from Nov 2023 to Jan 2024 (Collaborative Research: U.S. GEOTRACES GP17-OCE and GP17-ANT: Characterizing iron-binding organic ligands in the Southern Ocean and implications for iron cycling in the global ocean)

Summary:
Iron is an essential micronutrient for marine life, and its distribution across the world ocean is mostly driven by its complexation by a fraction of the dissolved organic matter pool called iron-binding ligands. This dataset includes the concentration and conditional stability constant of dissolved iron-binding ligands of samples collected during the U.S. GEOTRACES GP17-ANT cruise. This cruise was aiming to investigate the distribution of trace metals and dependent variables in the Amundsen Sea (Antarctica), hotspot of primary production and of major interest in carbon cycling. The cruise departed Punta Arenas (Chile) on November 29th, 2023 and arrived in Lyttelton (New Zealand) on January 28th 2024, after sample collection in the Amundsen Sea (Antarctica). Seawater samples were collected with a tow-fish and a trace metal clean rosette equipped with 24 GoFlo bottles, placed in acid-clean FLPE bottles, and stored frozen (-20 degrees Celsius) until onboard analysis by Dr. Léo Mahieu, if not analyzed within 24 hours after collection.

The Amundsen Sea is the site of some of the biggest phytoplanktonic blooms happening seasonally across the world ocean, and is, therefore, an important zone for carbon fixation and export. Yet, uncertainty remains about the processes fueling this bloom, notably for iron. The Amundsen Sea is characterized by shallow depth allowing for connectivity between sediment resuspension and phytoplankton iron supply, and by one of the higher rates of the sea-ice melt rate observed on the Antarctic continent. This dataset is the first one to present iron-binding ligand characteristics in samples deeper than 300 m in the Amundsen Sea, and allows us to report on the impact of sediment resuspension, ice melting, and biological productivity on iron-binding ligand characteristics and on their role in transporting iron in the Amundsen Sea.

cdm_data_type = Other
VARIABLES:
CRUISE (unitless)
SAMPLE_ID (unitless)
STATION (unitless)
DATE (unitless)
latitude (degrees_north)
longitude (degrees_east)
PLATFORM (unitless)
... (44 more variables)


[GP17-OCE Beryllium-7 in seawater and aerosols] - Aerosol and seawater beryllium-7 concentrations from the US GEOTRACES GP17-OCE cruise on R/V Roger Revelle (RR2214) in the South Pacific and Southern Oceans from December 2022 to January 2023 (US GEOTRACES GP17 Section: South Pacific and Southern Ocean (GP17-OCE))

Summary:
Beryllium-7, a radioactive isotope with a half-life of 53.3 days, is formed in the atmosphere, attaches to aerosol particles, and is deposited on the earth's surface through wet and dry processes. In this project, we measured Be-7 concentrations in aerosol particles and in seawater samples (depths < 200 meters) collected on the GEOTRACES GP17-OCE cruise aboard R/V Roger Revelle. The cruise originated in Papeete, Tahiti, French Polynesia on 1 December 2022 and concluded on 25 January 2023 in Punta Arenas, Chile. Sixteen aerosol samples and seawater from twelve stations in the South Pacific and Southern Oceans were collected. The dataset will be used to study the deposition of trace elements and isotopes (TEIs) and upper ocean mixing processes. Aerosol deposition is an important source of TE micronutrients to open ocean areas that are far removed from riverine sources. But, while the collection aerosol of samples for TEI analysis is straightforward, estimating the deposition flux also requires an appropriate deposition velocity (i.e. deposition flux is the product of the aerosol concentration and deposition velocity). Because Be-7 is supplied to the open ocean exclusively through aerosol deposition and it is removed through radioactive decay, the water column inventory and aerosol concentration of Be-7 can be used to derive the deposition velocity applicable to aerosol TEIs. The penetration of dissolved Be-7 below the ocean mixed layer is limited by the isotope's half-life and the rate of vertical diffusive mixing. Through modeling, the shape of the Be-7 profile below the mixed layer provides an estimate for the vertical diffusivity coefficient (Kz), which can be used to calculate fluxes of chemical species (e.g. oxygen) and physical properties (e.g. heat).

cdm_data_type = Other
VARIABLES:
Station_ID (unitless)
Event_ID (unitless)
Start_Date_UTC (unitless)
Start_Time_UTC (unitless)
time (Start_iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
End_Date_UTC (unitless)
End_Time_UTC (unitless)
End_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
Start_Latitude (degrees_north)
... (11 more variables)