[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 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 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 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 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-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)


[GP17-OCE Dissolved Gallium in the South Pacific Ocean] - Dissolved gallium (Ga) 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:
Dissolved gallium (Ga) was determined in association with a US GEOTRACES cruise (GP17-OCE/RR2214) in the South Pacific and Southern Ocean. The cruise sampled formation regions for globally distributed water masses, the return flow of Pacific Deep Water into the Southern Ocean, hydrothermally influenced waters, margin waters, and a gradient of low to high productivity with varying limiting nutrients. The cruise track investigates circulation through the Antarctic Circumpolar Current (ACC) and formation of intermediate waters important for upper ocean nutrient supply. The overall circulation/productivity/export/recycling trap of this region also affects how oceanic element-element relationships develop. For Ga, its distribution can provide insight into dust delivery, which recent work has suggested may be higher than previously thought in the study area. Ga's limited reactivity also allows its distribution to be used for water mass deconvolution, which could be usefully applied to the ACC and intermediate water formation regions. Data include dissolved Ga concentrations from bottle and towed fish samples.

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)
Ga_D_CONC_BOTTLE_hxhmr3 (picomoles per kilogram (pmol/kg))
SD1_Ga_D_CONC_BOTTLE_hxhmr3 (picomoles per kilogram (pmol/kg))
Flag_Ga_D_CONC_BOTTLE_hxhmr3 (unitless)
Ga_D_CONC_FISH_dhewdf (picomoles per kilogram (pmol/kg))
SD1_Ga_D_CONC_FISH_dhewdf (picomoles per kilogram (pmol/kg))
Flag_Ga_D_CONC_FISH_dhewdf (unitless)


[GP17-OCE Dissolved Seawater Barium Concentrations] - Dissolved barium (Ba) concentrations in seawater samples collected on 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-OCE: Investigating the role of the Southern Ocean's biogeochemical divide in shaping the global distributions of radium and barium isotopes)

Summary:
This dataset includes measurements of dissolved barium (Ba) concentrations in the South Pacific and Southern Ocean from the US GEOTRACES GP17 section (GP17-OCE, Papeete, Tahiti to Punta Arenas, Chile) on R/V Roger Revelle from December 2022 to January 2023.

cdm_data_type = Other
VARIABLES:
Cruise_ID (unitless)
Station_ID (unitless)
Event_ID (unitless)
GEOTRC_INSTR (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)
End_Latitude (degrees_north)
End_Longitude (degrees_east)
Rosette_Position (unitless)
Sample_ID (unitless)
depth (Sample_depth, m)
Ba_D_CONC_FISH_wtoyqq (nanomoles per kilogram (nmol/kg))
SD1_Ba_D_CONC_FISH_wtoyqq (nanomoles per kilogram (nmol/kg))
Flag_Ba_D_CONC_FISH_wtoyqq (unitless)
Ba_D_CONC_UWAY_ththaj (nanomoles per kilogram (nmol/kg))
SD1_Ba_D_CONC_UWAY_ththaj (nanomoles per kilogram (nmol/kg))
Flag_Ba_D_CONC_UWAY_ththaj (unitless)
Ba_D_CONC_BOTTLE_xhbqq4 (nanomoles per kilogram (nmol/kg))
SD1_Ba_D_CONC_BOTTLE_xhbqq4 (nanomoles per kilogram (nmol/kg))
Flag_Ba_D_CONC_BOTTLE_xhbqq4 (unitless)


[GP17-OCE Dissolved Total and Labile Cobalt] - Dissolved total (dCo) and labile Co (lCo) measurements 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:
Despite the scarcity of cobalt in the global ocean, it plays important roles in some cellular functions, both in its role as a central factor in vitamin B12, and as an inorganic protein cofactor. Consequently, its distribution and speciation in marine environments is an important factor in understanding the activity of marine biota. Dissolved cobalt often displays a 'hybrid' profile type, with biological uptake dominating in the surface waters and removal by scavenging onto particles in the mesopelagic and below. These scavenging processes limit the accumulation of dissolved Co in the deep ocean. The relative contributions of scavenging and surface biological uptake are variable regionally due to both chemical and biological factors: recent research shows that dCo inventories may be intimately tied to the manganese redox cycle and formation of Mn oxides, and thus is heavily influenced by oxygen availability and local microbial community structure. Variability in Co usage - and by extension, its stoichiometry with respect to macronutrients - could be the result of differing uses of and needs for Co-utilizing metalloenzymes between taxa, and the plasticity of individual organisms with regards to metal availability. This dataset includes dissolved total (dCo) and labile Co (lCo) measurements from the GP17-OCE expedition, which occurred from 1 December 2022 to 25 January 2023, and traversed the South Pacific and a portion of the Southern Ocean. dCo samples are UV-irradiated before measurement, and so include both ligand bound and free Co. lCo samples are not UV-irradiated, thus represent the free Co inventory and that which is very weakly bound. lCo can be considered as the more bioavailable fraction. These samples were analyzed using competitive ligand exchange cathodic stripping voltammetry with a hanging mercury drop electrode. The dissolved Co distribution is understudied in much of the ocean, including the Southern Ocean. Given the contribution of the Southern Ocean to global deep water formation, the influences on the dCo inventory in this region likely impact Co supply in all ocean basins.

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)
... (23 more variables)


[GP17-OCE ODF nutrients] - Nutrients and bottle oxygen measured by the Scripps ODF group on the US GEOTRACES GP17-OCE cruise on R/V Roger Revelle (RR2214) from December 2022 to January 2023 in the South Pacific and Southern Oceans (US GEOTRACES GP17 Section: South Pacific and Southern Ocean (GP17-OCE))

Summary:
This dataset includes the nutrients and bottle oxygen measurements made by the Ocean Data Facility (ODF) group of  Scripps Institution of Oceanography during the US GEOTRACES GP17-OCE cruise. The cruise took place on R/V Roger Revelle (cruise ID RR2214) from December 2022 to January 2023 in the South Pacific and Southern Oceans.

cdm_data_type = Other
VARIABLES:
EXPOCODE (unitless)
SECT_ID (unitless)
STNNBR (unitless)
CASTNO (unitless)
SAMPNO (unitless)
BTLNBR (unitless)
BTLNBR_FLAG_W (unitless)
EVENT_NUMBER (unitless)
GEOTRC_SAMPNO (unitless)
time (Iso_datetime_utc, seconds since 1970-01-01T00:00:00Z)
DATE (unitless)
TIME (unitless)
latitude (degrees_north)
longitude (degrees_east)
depth (m)
REFTMP (degrees Celsius)
REFTMP_FLAG_W (unitless)
BTL_ISO_DateTime_UTC (seconds since 1970-01-01T00:00:00Z)
BTL_DATE (unitless)
BTL_TIME (unitless)
BTL_LAT (degrees_north)
BTL_LON (degrees_east)
CTDPRS (decibars (dbar))
CTDPRS_FLAG_W (unitless)
... (46 more variables)


[GP17-OCE Water Column Radium Isotopes] - Measurements of the dissolved isotope radium-226 from samples collected on 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-OCE: Investigating the role of the Southern Ocean's biogeochemical divide in shaping the global distributions of radium and barium isotopes)

Summary:
This dataset includes measurements of the dissolved isotope radium-226 in the South Pacific and Southern Ocean. Samples were collected on the US GEOTRACES GP17-OCE cruise (Papeete, Tahiti to Punta Arenas, Chile) on R/V Roger Revelle from December 2022 to January 2023. Radium-223, radium-224, and radium-228 data will be made available in the future.

cdm_data_type = Other
VARIABLES:
Cruise_ID (unitless)
Station_ID (unitless)
GEOTRC_CASTNO (unitless)
GEOTRC_INSTR (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)
Ra_226_D_CONC_BOTTLE_xuuvtd (milliBecquerels per kilogram (mBq/kg))
SD1_Ra_226_D_CONC_BOTTLE_xuuvtd (milliBecquerels per kilogram (mBq/kg))
Flag_Ra_226_D_CONC_BOTTLE_xuuvtd (unitless)
Ra_226_D_CONC_PUMP_faz5oh (milliBecquerels per kilogram (mBq/kg))
SD1_Ra_226_D_CONC_PUMP_faz5oh (milliBecquerels per kilogram (mBq/kg))
Flag_Ra_226_D_CONC_PUMP_faz5oh (unitless)
Ra_226_D_CONC_UWAY_0nplfd (milliBecquerels per kilogram (mBq/kg))
SD1_Ra_226_D_CONC_UWAY_0nplfd (milliBecquerels per kilogram (mBq/kg))
Flag_Ra_226_D_CONC_UWAY_0nplfd (unitless)


[GPpr09 Dissolved Th and Pa] - Depth profiles of seawater dissolved 232Th, 230Th, and 231Pa from R/V Sonne cruise SO245 (UltraPac, GPpr09) during Dec 2015 to Jan 2016 (Supply and removal of trace elements in the subtropical South Pacific)

Summary:
This dataset contains depth profiles of seawater dissolved 232Th, 230Th, and 231Pa from R/V Sonne cruise SO245 (UltraPac, GPpr09).

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)
Th_230_D_CONC_BOTTLE_tf6m7p (uBq/kg)
SD1_Th_230_D_CONC_BOTTLE_tf6m7p (uBq/kg)
Flag_Th_230_D_CONC_BOTTLE_tf6m7p (unitless)
Th_232_D_CONC_BOTTLE_lffbvx (pmol/kg)
SD1_Th_232_D_CONC_BOTTLE_lffbvx (pmol/kg)
Flag_Th_232_D_CONC_BOTTLE_lffbvx (unitless)
Pa_231_D_CONC_BOTTLE_rrjlxc (uBq/kg)
SD1_Pa_231_D_CONC_BOTTLE_rrjlxc (uBq/kg)
Flag_Pa_231_D_CONC_BOTTLE_rrjlxc (unitless)
Th_230_D_XS_CONC_BOTTLE (uBq/kg)
SD1_Th_230_D_XS_CONC_BOTTLE (uBq/kg)
Flag_Th_230_D_XS_CONC_BOTTLE (unitless)
Pa_231_D_XS_CONC_BOTTLE (uBq/kg)
SD1_Pa_231_D_XS_CONC_BOTTLE (uBq/kg)
Flag_Pa_231_D_XS_CONC_BOTTLE (unitless)


[GPpr09 Particulate Th and Pa] - Depth profiles of seawater particulate 232Th, 230Th, and 231Pa from R/V Sonne cruise SO245 (UltraPac, GPpr09) during Dec 2015 to Jan 2016 (Supply and removal of trace elements in the subtropical South Pacific)

Summary:
This dataset contains depth profiles of seawater particulate 232Th, 230Th, and 231Pa from R/V Sonne cruise SO245 (UltraPac, GPpr09).

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)
Th_232_TP_CONC_PUMP_oboqio (pmol/kg)
SD1_Th_232_TP_CONC_PUMP_oboqio (pmol/kg)
Flag_Th_232_TP_CONC_PUMP_oboqio (unitless)
Th_230_TP_CONC_PUMP_e6mfsz (uBq/kg)
SD1_Th_230_TP_CONC_PUMP_e6mfsz (uBq/kg)
Flag_Th_230_TP_CONC_PUMP_e6mfsz (unitless)
Pa_231_TP_CONC_PUMP_r0ifiu (uBq/kg)
SD1_Pa_231_TP_CONC_PUMP_r0ifiu (uBq/kg)
Flag_Pa_231_TP_CONC_PUMP_r0ifiu (unitless)
Th_230_TP_XS_CONC_PUMP (uBq/kg)
SD1_Th_230_TP_XS_CONC_PUMP (uBq/kg)
Flag_Th_230_TP_XS_CONC_PUMP (unitless)
Pa_231_TP_XS_CONC_PUMP (uBq/kg)
SD1_Pa_231_TP_XS_CONC_PUMP (uBq/kg)
Flag_Pa_231_TP_XS_CONC_PUMP (unitless)


[GPS waypoints] - GPS waypoints for habitat complexity photos collected along the Northern Central California coast from 2017 to 2021 (Collaborative Proposal: Selection and Genetic Succession in the Intertidal -- Population Genomics of Pisaster ochraceus During a Wasting Disease Outbreak and its Aftermath)

Summary:
GPS waypoints for habitat complexity photos collected along the Northern Central California coast from 2017 to 2021.

cdm_data_type = Other
VARIABLES:
wpt_ID (unitless)
lat (degrees_north)
longitude (degrees_east)
Date (unitless)
time (seconds since 1970-01-01T00:00:00Z)
Site (unitless)
Area (unitless)
GPS_name (unitless)
GPS_ID (unitless)


[Gridded in-situ oxygen profiles] - Gridded in-situ oxygen profiles from glider deployments in the San Pedro Channel, CA in 2013 and 2014 (Collaborative Research: Use of Triple Oxygen Isotopes and O2/Ar to constrain Net/Gross Oxygen Production during upwelling and non-upwelling periods in a Coastal Setting)

Summary:
Gridded in-situ oxygen profiles from glider deployments in the San Pedro Channel, CA in 2013 and 2014.

cdm_data_type = Other
VARIABLES:
BINID (unitless)
DATENUM_GMT (unitless)
time (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
YEAR (unitless)
latitude (degrees_north)
longitude (degrees_east)
depth (m)
OXYGEN (millimoles per cubic meter (mmol m^-3))


[Gridded in-situ profiles] - Gridded in-situ profiles from glider deployments in the San Pedro Channel, CA in 2013 and 2014 (Collaborative Research: Use of Triple Oxygen Isotopes and O2/Ar to constrain Net/Gross Oxygen Production during upwelling and non-upwelling periods in a Coastal Setting)

Summary:
This dataset includes chlorophyll a fluorescence and water temperature from gridded in-situ profiles from a slocum glider deployed between March and July in 2013 and 2014 in the San Pedro Channel, located in the Southern California Bight off the coast of Los Angeles.

cdm_data_type = Other
VARIABLES:
BINID (unitless)
DATENUM_GMT (unitless)
time (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
YEAR (unitless)
latitude (degrees_north)
longitude (degrees_east)
depth (m)
CHL (milligrams per meter cubed (mg/m^3))
TEMP (Temperature, degrees Celsius (C))


[Groves Creek 'Omits] - Metagenomic, metatranscriptomics and 16S rRNA gene sequence data from diel sampling at Groves Creek Marsh, Skidaway Island, GA during July 2014 (Collaborative Research: Marine priming effect - molecular mechanisms for the biomineralization of terrigenous dissolved organic matter in the ocean)

Summary:
Groves Creek Marsh (31.972\u00b0 N, 81.028\u00b0 W), a temperate salt marsh fringing Skidaway Island, GA served as the field site for this study. During July 16-17, 2014, samples were collected every two hours and four minutes to evenly sample across two tidal cycles and one diurnal cycle.

cdm_data_type = Other
VARIABLES:
Time_point (unitless)
time (seconds since 1970-01-01T00:00:00Z)
Temperature (degrees Celsius)
depth (m)
Salinity (Sea Water Practical Salinity, parts per thousand (ppt))
Cell_Density (cells per mililiter (cells/mL))
Bacterial_Production (milimole per hour (mmol/h))
DOC (mm)
TDN (mm)
DOC_TDN (unitless)
a254_DOC (unitless)
Lignin (mg 1/ mg OC)
latitude (degrees_north)
longitude (degrees_east)


[GS02 Beryllium-7 in seawater and aerosols] - Aerosol and seawater beryllium-7 concentrations from the French GEOTRACES GS02 SWINGS cruise aboard R/V Marion-Dufresne (MD229) from January to March 2021 (Collaborative Research: Quantifying the atmospheric flux of bio-active trace elements to the southwestern Indian Ocean)

Summary:
Beryllium-7, a cosmogenic 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 French GEOTRACES section GS02 SWINGS cruise aboard R/V Marion-Dufresne. The cruise originated at Réunion Island on 11 January 2021 and concluded at Réunion on 8 March 2021. Nineteen aerosol samples and seawater from eleven stations in the South Indian Ocean 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.

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)
... (7 more variables)


[GT10 - CDOM] - Absorption coefficients of colored dissolved organic matter (CDOM) along US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical N. Atlantic in 2010 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
Absorption coefficients of colored dissolved organic matter (CDOM) along US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical N. Atlantic in 2010 (U.S. GEOTRACES NAT project).

cdm_data_type = Other
VARIABLES:
cruise_id (dimensionless)
station_GEOTRC (dimensionless)
cast_GEOTRC (dimensionless)
event_GEOTRC (dimensionless)
latitude (degrees_north)
longitude (degrees_east)
depth (m)
depth_GEOTRC_CTD (Depth, meters)
sample_GEOTRC (dimensionless)
bottle_GEOTRC (dimensionless)
sample_bottle_GEOTRC (dimensionless)
time (BTL ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
yrday (unitless)
date_gmt (unitless)
time_gmt (unitless)
replicates (dimensionless)
wavelength (nanometers)
absp_coef (1/meters)


[GT10 - CTD and PUMP - Cast Events] - CTD and pump cast events associated with the US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical N. Atlantic during 2010 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
CTD and pump cast events associated with the US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical N. Atlantic during 2010 (U.S. GEOTRACES NAT project)

cdm_data_type = Other
VARIABLES:
cast (text)
event_GEOTRC (integer)
type (text)
activity (text)
date (unitless)
time2 (Time, unitless)
latitude (degrees_north)
longitude (degrees_east)
speed (knots)
course (degrees)
depth (m)
DAB (meters)
wire_out (meters)
press_max (decibars)
duration (unitless)
time (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)


[GT10 - DOC] - Dissolved organic carbon (DOC) from US GEOTRACES North Atlantic Transect cruise on the R/V Knorr KN199-04 in the subtropical N. Atlantic in 2010 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
Dissolved organic carbon (DOC) from US GEOTRACES North Atlantic Transect cruise on the R/V Knorr KN199-04 in the subtropical N. Atlantic in 2010.

cdm_data_type = Other
VARIABLES:
cruise_id (dimensionless)
station_GEOTRC (dimensionless)
cast_GEOTRC (dimensionless)
event_GEOTRC (dimensionless)
latitude (degrees_north)
longitude (degrees_east)
date_gmt (unitless)
time_gmt (unitless)
yrday_gmt (unitless)
bottle_GEOTRC (dimensionless)
sample_GEOTRC (dimensionless)
sample_bottle_GEOTRC (dimensionless)
depth (m)
depth_GEOTRC_CTD (Depth, meters)
DOC (micromoles/Liter)
DOC_sd (micromoles/Liter)
replicate (dimensionless)
DOC_qf (dimensionless)
time (BTL ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)


[GT10 - Nanomolar Nutrients - Surface] - PO4, NO3, NO2 surface concentrations along the US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04, KN199-05 cruises in the subtropical N. Atlantic during 2010 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
PO4, NO3, NO2 surface concentrations along the US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04, KN199-05 cruises in the subtropical N. Atlantic during 2010.

cdm_data_type = Other
VARIABLES:
cruise_id (text)
GeoFish_id (Geo Fish Id, integer)
event_GEOTRC (dimensionless)
GeoTraces_ID (Geo Traces ID, integer)
sample_GEOTRC (dimensionless)
date (unitless)
time2 (Time, HHMM)
latitude (degrees_north)
longitude (degrees_east)
PO4 (Mass Concentration Of Phosphate In Sea Water, nmol/L)
PO4_Flag (integer)
NO3 (Mole Concentration Of Nitrate In Sea Water, nmol/L)
NO3_Flag (integer)
NO2 (Mole Concentration Of Nitrite In Sea Water, nmol/L)
NO2_Flag (integer)
Remarks (text)
time (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)


[GT10 - POC_PON] - Particulate organic carbon (POC) and nitrogen (PON) along US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical N. Atlantic from 2010 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
Particulate organic carbon (POC) and nitrogen (PON) along US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical N. Atlantic from 2010.

cdm_data_type = Other
VARIABLES:
cruise_id (dimensionless)
station_GEOTRC (dimensionless)
cast_GEOTRC (dimensionless)
event_GEOTRC (dimensionless)
bottle_GEOTRC (dimensionless)
sample_bottle_GEOTRC (dimensionless)
sample_GEOTRC (dimensionless)
latitude (degrees_north)
longitude (degrees_east)
time_gmt (unitless)
yrday_gmt (unitless)
date_gmt (unitless)
depth (m)
POC (Particulate Organic Carbon, milligrams/m^3)
POC_sd (milligrams/m^3)
PON (milligrams/m^3)
PON_sd (milligrams/m^3)
replicate (dimensionless)
depth_GEOTRC_CTD (Depth, meters)
time (BTL ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)


[GT10 - SPM] - Suspended particulate matter along US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical northern Atlantic Ocean in 2010 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
Suspended particulate matter along US GEOTRACES North Atlantic Transect from the R/V Knorr KN199-04 cruise in the subtropical northern Atlantic Ocean in 2010.

cdm_data_type = Other
VARIABLES:
cruise_id (nd)
station_GEOTRC (dimensionless)
sample_GEOTRC (dimensionless)
latitude (degrees_north)
longitude (degrees_east)
time_gmt (unitless)
yrday_gmt (unitless)
date_gmt (unitless)
depth (m)
SPM (mg/Liter)
SPM_sd (mg/Liter)
replicate (dimensionless)
SPM_qflag (dimensionless)
cast_GEOTRC (dimensionless)
event_GEOTRC (dimensionless)
sample_bottle_GEOTRC (dimensionless)
bottle_GEOTRC (dimensionless)
depth_GEOTRC_CTD (Depth, meters)
time (BTL ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)


[GT10-11 - cellular element quotas] - Cellular elemental content of individual phytoplankton cells collected during US GEOTRACES North Atlantic Transect cruises in the Subtropical western and eastern North Atlantic Ocean during Oct and Nov, 2010 and Nov. 2011 (U.S. GEOTRACES North Atlantic Transect)

Summary:
Individual phytoplankton cells were collected on the GEOTRACES North Atlantic
Transect cruises were analyzed for elemental content using SXRF (Synchrotron
radiation X-Ray Fluorescence). Carbon was calculated from biovolume using the
relationships of Menden-Deuer & Lessard (2000). Trace metal concentrations are
reported.

Download zipped images:
[Chlorophyll](\\http://data.bco-dmo.org/GEOTRACES/Twining/Chl_image.zip\\)
[Light](\\http://data.bco-dmo.org/GEOTRACES/Twining/Light_image.zip\\)
[SXRF maps](\\http://data.bco-dmo.org/GEOTRACES/Twining/SXRF_map.zip\\)
[SXRF spectra](\\http://data.bco-
dmo.org/GEOTRACES/Twining/SXRF_spectra.zip\\)

Related references:

Menden-Deuer, S. and E. J. Lessard (2000). Carbon to volume relationships for
dinoflagellates, diatoms, and other protist plankton. Limnology and
Oceanography 45(3): 569-579.

* Twining, B. S., S. Rauschenberg, P. L. Morton, and S. Vogt. 2015. Metal contents of phytoplankton and labile particulate material in the North Atlantic Ocean. Progress in Oceanography 137: 261-283.)

cdm_data_type = Other
VARIABLES:
cruise_id (unitless)
project (unitless)
station_GEOTRC (unitless)
sta_PI (unitless)
latitude (degrees_north)
longitude (degrees_east)
... (28 more variables)


[GT10-11 - delta 15N-NO3] - delta 15N of nitrate from R/V Knorr cruise KN199-04 & KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
Dataset includes delta 15N of nitrate (NO3) measurements from the GT10 and GT11 (KN199-04 and KN204-01) U.S. GEOTRACES North Atlantic Transect cruises.

cdm_data_type = Other
VARIABLES:
cruise_id (text)
year (unitless)
station_GEOTRC (dimensionless)
depth (m)
press (decibars)
event_GEOTRC (dimensionless)
cast_GEOTRC (dimensionless)
sample_GEOTRC (dimensionless)
sample_bottle_GEOTRC (dimensionless)
bottle_GEOTRC (dimensionless)
month_gmt (unitless)
day_gmt (unitless)
time_gmt (unitless)
latitude (degrees_north)
longitude (degrees_east)
d15N_NO3 (Mole Concentration Of Nitrate In Sea Water, per mil)
d15N_NO3_sd (D15 N NO3 Sd, per mil)
n (dimensionless)
flag_low_area (dimensionless)
flag_low_conc (dimensionless)
ISO_DateTime_UTC (ISO Date Time UTC, unitless)
time (BTL ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)


[GT10-11 - delta 30Si] - Profiles of stable isotopes of silicon (Si) in silicic acid (Si(OH)4) from R/V Knorr cruises KN199-04, KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
Profiles of stable isotopes of silicon in silicic acid (delta 30Si) collected at stations during the GT10 (KN199-04) and GT11 (KN204-01) U.S. GEOTRACES North Atlantic Transect cruises.

cdm_data_type = Other
VARIABLES:
cruise_id (text)
cruise_name (text)
station_GEOTRC (dimensionless)
cast_GEOTRC (dimensionless)
event_GEOTRC (dimensionless)
depth_w (Depth, meters)
latitude (degrees_north)
longitude (degrees_east)
date_gmt (unitless)
time_gmt (unitless)
event_ISO_DateTime_UTC (Event ISO Date Time UTC, unitless)
sample_GEOTRC (dimensionless)
sample_bottle_GEOTRC (dimensionless)
bottle_GEOTRC (dimensionless)
depth (m)
d30Si_mean (D30 Si Mean, per mil (0/00))
d30Si_mean_sd (D30 Si Mean Sd, per mil (0/00))
num_reps (dimensionless)
status_comment (text)
time (BTL ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)


[GT10-11 - delta_13C] - delta 13C measurement of dissolved inorganic carbon (DIC) from R/V Knorr cruises KN199-04 and KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
delta 13C measurements made on dissolved inorganic carbon (DIC) samples collected at stations during the GT10 and GT11 (KN199-04 and KN204-01) cruises as part of the U.S. GEOTRACES North Atlantic Transect project.

cdm_data_type = Other
VARIABLES:
cruise_id (dimensionless)
cruise_name (dimensionless)
station_GEOTRC (dimensionless)
lat_nom (Latitude, decimal degrees)
lon_nom (Longitude, decimal degrees)
depth (m)
cast_GEOTRC (dimensionless)
sample_bottle_GEOTRC (dimensionless)
latitude (degrees_north)
longitude (degrees_east)
month (unitless)
day (unitless)
year (unitless)
delta13C (Delta13 C, per mil)
delta13C_flag (Delta13 C Flag, dimensionless)
event_GEOTRC (dimensionless)
sample_GEOTRC (dimensionless)
bottle_GEOTRC (dimensionless)
time (BTL ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)


[GT10-11 - DIC_TA] - Inorganic Carbon along US GEOTRACES North Atlantic Transect from R/V Knorr KN199-04, KN204-01 cruises in the subtropical N. Atlantic from 2010-2011 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
Dissolved inorganic carbon (DIC) and total alkalinity (TA) data from the 2010 and 2011 GEOTRACES North Atlantic Cruises.

cdm_data_type = Other
VARIABLES:
expocode (dimensionless)
sect_id (dimensionless)
station_GEOTRC (dimensionless)
cast_GEOTRC (dimensionless)
event_GEOTRC (dimensionless)
latitude (degrees_north)
longitude (degrees_east)
date_utc (unitless)
time_utc (hhmm)
sample_GEOTRC (dimensionless)
sample_bottle_GEOTRC (dimensionless)
bottle_GEOTRC (dimensionless)
bottle_qflag (dimensionless)
depth_bottom (Depth, meters)
depth (m)
press (decibars)
temp (Temperature, degrees Celsius)
sal (dimensionless)
sal_qflag (dimensionless)
sal_bottle (dimensionless)
sal_bottle_qflag (dimensionless)
DIC (micromoles/kg)
DIC_qflag (dimensionless)
comments_DIC (dimensionless)
TALK (micromoles per Kilogram)
TALK_qflag (dimensionless)
comments_TALK (dimensionless)
time (BTL ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)


[GT10-11 - Particulate composition] - Size-fractionated major and minor particle composition and concentration from R/V Knorr KN199-04 & KN204-01 (GA03) in the subtropical North Atlantic Ocean from 2010-2011 (U.S. GEOTRACES North Atlantic Transect)

Summary:
Size-fractionated major and minor particle composition and concentration from R/V Knorr KN199-04, KN204-01 in the subtropical North Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project).

cdm_data_type = Other
VARIABLES:
cruise_id (text)
station_GEOTRC (unitless)
latitude (degrees_north)
longitude (degrees_east)
date (unitless)
time2 (Time, unitless)
depth_w (Depth, meters)
cast_GEOTRC (integer)
cast_flag (unitless)
cast_type (integer)
event_GEOTRC (unitless)
depth_n (Depth, meters)
depth_flag (Depth, unitless)
depth_sd (Depth, meters)
depth_sd_flag (Depth, unitless)
depth (m)
depth_GEOTRC_CTD_round (Depth, meters)
sample_GEOTRC (unitless)
sample_bottle_GEOTRC (integer)
bottle_GEOTRC (unitless)
sample_GEOTRC_flag (unitless)
BTL_ISO_DateTime_UTC (BTL ISO Date Time UTC, unitless)
time (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
pump (unitless)
pump_flag (unitless)
vol_QMA (liters)
... (219 more variables)


[GT10-11 - Particulate Po Pb] - Particulate 210Po and 210Pb from R/V Knorr KN199-04, KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
Particulate 210Po and 210Pb from R/V Knorr KN199-04, KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011.

cdm_data_type = Other
VARIABLES:
cruise_id (dimensionless)
cruise_name (dimensionless)
station_GEOTRC (dimensionless)
depth (m)
cast_GEOTRC (dimensionless)
latitude (degrees_north)
longitude (degrees_east)
event_GEOTRC (dimensionless)
sample_GEOTRC (dimensionless)
sample_bottle_GEOTRC (dimensionless)
bottle_GEOTRC (dimensionless)
instr (unitless)
time (BTL ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
Po_210 (dpm (nuclear decays per minute)/100 kilgrams)
Po_210_sd (dpm/100 kilgrams)
Pb_210 (dpm/100 kilgrams)
Pb_210_sd (dpm/100 kilgrams)
Po_Pb_ratio (dimensionless)
Po_Pb_ratio_sd (dimensionless)


[GT10-11 - Th234 Particulate] - Particulate Thorium-234 from in situ pumps from R/V Knorr cruises KN199-04 and KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
Particulate Th-234 from in situ pumps, including large size fraction (> 51 um) and small size fraction (1-51 um), from the 2010 and 2011 U.S. GEOTRACES cruises.

cdm_data_type = Other
VARIABLES:
cruise_id (text)
station_GEOTRC (unitless)
cruise_part (text)
latitude (degrees_north)
longitude (degrees_east)
event_GEOTRC (unitless)
cast_GEOTRC (unitless)
month_gmt (unitless)
day_gmt (unitless)
year (unitless)
time_gmt (unitless)
time (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
depth (m)
depth_n (Depth, meters)
depth_GEOTRC_CTD (Depth, meters)
sample_GEOTRC (unitless)
sample_bottle_GEOTRC (unitless)
bottle_GEOTRC (unitless)
pump (unitless)
Th234_p_1to51 (dpm/Liter)
Th234_p_1to51_unc (dpm/Liter)
Th234_p_gt51 (dpm/Liter)
Th234_p_gt51_unc (dpm/Liter)
q_flag (unitless)
BTL_ISO_DateTime_UTC (BTL ISO Date Time UTC, unitless)


[GT10-11 - Th234_Total_and_U238] - Water-column total Thorium-234 and Uranium-238 from R/V Knorr cruises KN199-04 and KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
Water-column total Th-234 with 4 L method and U-238 from U-salinity relationship from the 2010 and 2011 U.S. GEOTRACES cruises.

cdm_data_type = Other
VARIABLES:
cruise_id (text)
station_GEOTRC (unitless)
cruise_part (text)
latitude (degrees_north)
longitude (degrees_east)
depth (m)
depth_n (Depth, meters)
depth_GEOTRC_CTD (Depth, meters)
event (unitless)
event_GEOTRC (unitless)
cast_GEOTRC (unitless)
sample_GEOTRC (unitless)
sample_bottle_GEOTRC (unitless)
bottle (unitless)
bottle_GEOTRC (unitless)
month_gmt (unitless)
day_gmt (unitless)
year (unitless)
time_gmt (unitless)
U238 (dpm/Liter)
U238_unc (dpm/Liter)
Th234_tot (dpm/Liter)
Th_234_tot_unc (dpm/Liter)
q_flag (unitless)
time (Cast ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
BTL_ISO_DateTime_UTC (BTL ISO Date Time UTC, unitless)


[GT11 -  CTD and PUMP - Cast Events] - CTD and pump cast events associated with the US GEOTRACES North Atlantic Transect from the R/V Knorr KN204-01 cruise in the subtropical N. Atlantic during 2011 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
CTD and pump cast events associated with the US GEOTRACES North Atlantic Transect from the R/V Knorr KN204-01 cruise in the subtropical N. Atlantic during 2011 (U.S. GEOTRACES NAT project)

cdm_data_type = Other
VARIABLES:
station_GEOTRC (integer)
cruise_part (text)
cast_GEOTRC (integer)
event_GEOTRC (integer)
dep_type (text)
activity (text)
date (unitless)
time2 (Time, unitless)
latitude (degrees_north)
longitude (degrees_east)
depth (m)
ctd_id (integer)
dab (meters)
maxp (psi)
name ((tbd))
comment (text)
time (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)


[GT11 - CTD - Bottle Sampling Comments] - Bottle sampling comments associated with the US GEOTRACES North Atlantic Transect from the R/V Knorr KN204-01 cruise in the subtropical N. Atlantic during 2011 (U.S. GEOTRACES NAT project) (U.S. GEOTRACES North Atlantic Transect)

Summary:
Bottle sampling comments associated with the US GEOTRACES North Atlantic Transect from the R/V Knorr KN204-01 cruise in the subtropical N. Atlantic during 2011 (U.S. GEOTRACES NAT project)

cdm_data_type = Other
VARIABLES:
station_GEOTRC (integer)
cruise_part (text)
cast_GEOTRC (integer)
date (unitless)
time2 (Time, HHMMSS)
time (ISO Date Time UTC, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
type (text)
sample_bottle_GEOTRC (integer)
sample_GEOTRC (integer)
property (text)
code (integer)
who (text)
comments (text)


[Guaymas Basin 2014 Organic Matter C:N Ratio] - Organic matter C:N ratios from sediment cores collected on the Guaymas Basin Ridge flanks and the Sonora Margin from R/V El Puma during October 2014 (RAPID proposal: Site characterization cruise to document the active and extensive subsurface biosphere in the Guaymas Basin)

Summary:
Organic matter C:N ratios from sediment cores P6, P10, P11, P12, and P13, collected on the Guaymas Basin Ridge flanks and the Sonora Margin. Sediment cores were collected from R/V El Puma, the Pacific Coast research vessel of the Autonomous University of Mexico, leaving Guaymas on October 14, 2014, and heading to Mazatlan on October 27, 2014.

cdm_data_type = Other
VARIABLES:
core (unitless)
latitude (degrees_north)
longitude (degrees_east)
depth_water (Depth, meters (m))
core_sample (unitless)
depth_cmbsf (Depth, centimeters (cm))
CtoN_ratio (Cto N Ratio, unitless)
time (seconds since 1970-01-01T00:00:00Z)


[Guaymas Basin 2014 Organic Matter del13C] - delta 13C values from sediment cores collected on the Guaymas Basin Ridge flanks and the Sonora Margin from R/V El Puma during October 2014 (RAPID proposal: Site characterization cruise to document the active and extensive subsurface biosphere in the Guaymas Basin)

Summary:
delta 13C values from sediment cores P6, P10, P11, P12, and P13, collected on the Guaymas Basin Ridge flanks and the Sonora Margin. Sediment cores were collected from R/V El Puma, the Pacific Coast research vessel of the Autonomous University of Mexico, leaving Guaymas on October 14, 2014, and heading to Mazatlan on October 27, 2014.

cdm_data_type = Other
VARIABLES:
core (unitless)
latitude (degrees_north)
longitude (degrees_east)
depth_water (Depth, meters (m))
core_sample (unitless)
depth_cmbsf (Depth, centimeters (cm))
Orgmatter_del13C (Orgmatter Del13 C, per thousand)
time (seconds since 1970-01-01T00:00:00Z)


[Guaymas Basin 2014 Organic Matter del15N] - delta 15N values from sediment cores collected on the Guaymas Basin Ridge flanks and the Sonora Margin from R/V El Puma during October 2014 (RAPID proposal: Site characterization cruise to document the active and extensive subsurface biosphere in the Guaymas Basin)

Summary:
delta 15N values from sediment cores P6, P10, P11, P12, and P13, collected on the Guaymas Basin Ridge flanks and the Sonora Margin. Sediment cores were collected from R/V El Puma, the Pacific Coast research vessel of the Autonomous University of Mexico, leaving Guaymas on October 14, 2014, and heading to Mazatlan on October 27, 2014.

cdm_data_type = Other
VARIABLES:
core (unitless)
latitude (degrees_north)
longitude (degrees_east)
depth_water (Depth, meters (m))
core_sample (unitless)
depth_cmbsf (Depth, centimeters (cm))
Orgmatter_del15N (Orgmatter Del15 N, per thousand)
time (seconds since 1970-01-01T00:00:00Z)


[Guaymas Basin 2014 Si] - Porewater Si concentrations from sediment cores collected on the Guaymas Basin Ridge flanks and the Sonora Margin from R/V El Puma during October 2014 (RAPID proposal: Site characterization cruise to document the active and extensive subsurface biosphere in the Guaymas Basin)

Summary:
Porewater Si concentrations from sediment cores P3, P6, P10, P11, P12, and P13, collected on the Guaymas Basin Ridge flanks and the Sonora Margin. Sediment cores were collected from R/V El Puma, the Pacific Coast research vessel of the Autonomous University of Mexico, leaving Guaymas on October 14, 2014, and heading to Mazatlan on October 27, 2014.

cdm_data_type = Other
VARIABLES:
core (unitless)
latitude (degrees_north)
longitude (degrees_east)
depth_water (Depth, meters (m))
core_sample (unitless)
depth_cmbsf (Depth, centimeters (cm))
Si (Mass Concentration Of Silicate In Sea Water, millimoles per liter (mmol/L))
time (seconds since 1970-01-01T00:00:00Z)


[Guaymas Basin 2014 TOC] - TOC concentrations from sediment cores collected on the Guaymas Basin Ridge flanks and the Sonora Margin from R/V El Puma during October 2014 (RAPID proposal: Site characterization cruise to document the active and extensive subsurface biosphere in the Guaymas Basin)

Summary:
TOC concentrations from sediment cores P6, P10, P11, P12, and P13, collected on the Guaymas Basin Ridge flanks and the Sonora Margin. Sediment cores were collected from R/V El Puma, the Pacific Coast research vessel of the Autonomous University of Mexico, leaving Guaymas on October 14, 2014, and heading to Mazatlan on October 27, 2014.

cdm_data_type = Other
VARIABLES:
core (unitless)
latitude (degrees_north)
longitude (degrees_east)
depth_water (Depth, meters (m))
core_sample (unitless)
depth_cmbsf (Depth, centimeters (cm))
TOC (percent weight)
time (seconds since 1970-01-01T00:00:00Z)


[Guaymas Dissolved Radium AT42-05] - Dissolved radium isotope activity around Guaymas Basin from samples collected by CTD and HOV Alvin during R/V Atlantis cruise AT42-05 in November 2018 (Validation of a New Geochemical Approach to Constrain Deep Sea Porewater Residence Times and Advection Rates: Applications to Biogeochemical Cycling at Guaymas Basin)

Summary:
This dataset presents dissolved radium isotope activities around Guaymas Basin.

cdm_data_type = Other
VARIABLES:
Collection_Method (unitless)
Alvin_Dive_Number (unitless)
Core_Number (unitless)
Cast (unitless)
depth (m)
Depth_cmbsf (Depth, centimeters below seafloor (cmbsf))
time (Date Time, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
Sample_Volume (liters (L))
Ra223_Activity (dpm/100L)
Ra223_Unc (dpm/100L)
Ra224_Activity (dpm/100L)
Ra224_Unc (dpm/100L)
Ra226_Activity (dpm/100L)
Ra226_Unc (dpm/100L)
Ra228_Activity (dpm/100L)
Ra228_Unc (dpm/100L)


[Guaymas Sedimentary Radium AT37-06] - Sedimentary radium isotope activity around Guaymas Basin from samples collected by HOV Alvin during R/V Atlantis cruise AT37-06 in December 2016 (Validation of a New Geochemical Approach to Constrain Deep Sea Porewater Residence Times and Advection Rates: Applications to Biogeochemical Cycling at Guaymas Basin)

Summary:
This dataset presents sedimentary radium isotope activities around Guaymas Basin.

cdm_data_type = Other
VARIABLES:
Alivn_Dive_Num (unitless)
Core_Num (unitless)
Depth_Below_SWI (Depth, centimeters (cm))
time (Date Time, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
Filter_Mass (grams (g))
Ra224_Activity (dpm/g)
Ra224_Unc (dpm/g)
Th228_Activity (dpm/g)
Th228_Unc (dpm/g)


[Guaymas Water Column Radium AT37-06] - Dissolved radium isotope activity around Guaymas Basin from samples collected by CTD and HOV Alvin during R/V Atlantis cruise AT37-06 in December 2016 (Validation of a New Geochemical Approach to Constrain Deep Sea Porewater Residence Times and Advection Rates: Applications to Biogeochemical Cycling at Guaymas Basin)

Summary:
This dataset presents dissolved radium isotope activities around Guaymas Basin.

cdm_data_type = Other
VARIABLES:
Collection_Method (unitless)
Alvin_Dive_Number (unitless)
Cast (unitless)
depth (m)
Core_Number (unitless)
time (Date Time, seconds since 1970-01-01T00:00:00Z)
latitude (degrees_north)
longitude (degrees_east)
Sample_Volume (liters (L))
Ra223_Activity (dpm/100L)
Ra223_Unc (dpm/100L)
Ra224_Activity (dpm/100L)
Ra224_Unc (dpm/100L)
Ra226_Activity (dpm/100L)
Ra226_Unc (dpm/100L)
Ra228_Activity (dpm/100L)
Ra228_Unc (dpm/100L)