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| Dataset Title: | [GP15 Dissolved and Labile Cobalt Leg 1] - Dissolved Cobalt and Labile Cobalt from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect) 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_818383) |
| Information: | Summary
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| ISO 19115
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Attributes {
s {
Station_ID {
Float32 _FillValue NaN;
Float32 actual_range 1.0, 18.3;
String bcodmo_name "station";
String description "Station number";
String long_name "Station ID";
String units "unitless";
}
Start_Date_UTC {
String bcodmo_name "date";
String description "Sampling start date (UTC); format: MM-DD-YY";
String long_name "Start Date UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
String units "unitless";
}
Start_Time_UTC {
String bcodmo_name "time";
String description "Sampling start time (UTC); format: hh:mm";
String long_name "Start Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/";
String units "unitless";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.53777108e+9, 1.54012446e+9;
String axis "T";
String bcodmo_name "ISO_DateTime_UTC";
String description "Sampling start date/time (UTC) formatted to ISO8601 standard: YYYY-MM-DDThh:mmz";
String ioos_category "Time";
String long_name "Start ISO Date Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
String source_name "Start_ISO_DateTime_UTC";
String standard_name "time";
String time_origin "01-JAN-1970 00:00:00";
String time_precision "1970-01-01T00:00Z";
String units "seconds since 1970-01-01T00:00:00Z";
}
End_Date_UTC {
String bcodmo_name "date";
String description "Sampling end date (UTC); format: MM-DD-YY";
String long_name "End Date UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/ADATAA01/";
String units "unitless";
}
End_Time_UTC {
String bcodmo_name "time";
String description "Sampling end time (UTC); format: hh:mm";
String long_name "End Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/AHMSAA01/";
String units "unitless";
}
End_ISO_DateTime_UTC {
String bcodmo_name "ISO_DateTime_UTC";
String description "Sampling endt date/time (UTC) formatted to ISO8601 standard: YYYY-MM-DDThh:mmz";
String long_name "End ISO Date Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
String units "unitless";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range 19.681, 56.059;
String axis "Y";
String bcodmo_name "latitude";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "Sampling start latitude";
String ioos_category "Location";
String long_name "Latitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
String source_name "Start_Latitude";
String standard_name "latitude";
String units "degrees_north";
}
longitude {
String _CoordinateAxisType "Lon";
Float64 _FillValue NaN;
Float64 actual_range -156.962, -151.999;
String axis "X";
String bcodmo_name "longitude";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "Sampling start longitude";
String ioos_category "Location";
String long_name "Longitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String source_name "Start_Longitude";
String standard_name "longitude";
String units "degrees_east";
}
End_Latitude {
Float64 _FillValue NaN;
String bcodmo_name "latitude";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "Sampling end latitude";
String long_name "Latitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
String standard_name "latitude";
String units "decimal degrees North";
}
End_Longitude {
Float64 _FillValue NaN;
String bcodmo_name "longitude";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "Sampling end longitude";
String long_name "Longitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String standard_name "longitude";
String units "decimal degrees East";
}
Event_ID {
Int16 _FillValue 32767;
Int16 actual_range 6518, 6770;
String bcodmo_name "event";
String description "GEOTRACES event number";
String long_name "Event ID";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/";
String units "unitless";
}
Sample_ID {
Int16 _FillValue 32767;
Int16 actual_range 12322, 13916;
String bcodmo_name "sample";
String description "GEOTRACES sample number";
String long_name "Sample ID";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
String units "unitless";
}
depth {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "down";
Float64 _FillValue NaN;
Float64 actual_range 17.1, 5692.4;
String axis "Z";
String bcodmo_name "depth";
String description "Sample depth";
String ioos_category "Location";
String long_name "Sample Depth";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
String positive "down";
String standard_name "depth";
String units "m";
}
Co_D_CONC_BOTTLE_ifernt {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 397.0;
String bcodmo_name "trace_metal_conc";
String description "Concentration of dissolved Co (after UV oxidation) from Niskin";
String long_name "Co D CONC BOTTLE Ifernt";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "picomoles per kilogram (pmol/kg)";
}
SD1_Co_D_CONC_BOTTLE_ifernt {
Float64 _FillValue NaN;
String bcodmo_name "trace_metal_conc";
String description "One standard deviation of Co_D_CONC_BOTTLE_ifernt";
String long_name "SD1 Co D CONC BOTTLE Ifernt";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "picomoles per kilogram (pmol/kg)";
}
Flag_Co_D_CONC_BOTTLE_ifernt {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 9;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Quality flag for Co_D_CONC_BOTTLE_ifernt";
String long_name "Flag Co D CONC BOTTLE Ifernt";
String units "unitless";
}
L1Co_D_CONC_BOTTLE_v2phpz {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 110.2;
String bcodmo_name "trace_metal_conc";
String description "Concentration of dissolved labile Co from Niskin";
String long_name "L1 Co D CONC BOTTLE V2phpz";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "picomoles per kilogram (pmol/kg)";
}
SD1_L1Co_D_CONC_BOTTLE_v2phpz {
Float64 _FillValue NaN;
String bcodmo_name "trace_metal_conc";
String description "One standard deviation of L1Co_D_CONC_BOTTLE_v2phpz";
String long_name "SD1 L1 Co D CONC BOTTLE V2phpz";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "picomoles per kilogram (pmol/kg)";
}
Flag_L1Co_D_CONC_BOTTLE_v2phpz {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 9;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Quality flag for L1Co_D_CONC_BOTTLE_v2phpz";
String long_name "Flag L1 Co D CONC BOTTLE V2phpz";
String units "unitless";
}
Co_D_CONC_FISH_s5r59b {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 576.4;
String bcodmo_name "trace_metal_conc";
String description "Concentration of dissolved Co (after UV oxidation) from tow fish";
String long_name "Co D CONC FISH S5r59b";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "picomoles per kilogram (pmol/kg)";
}
SD1_Co_D_CONC_FISH_s5r59b {
Float64 _FillValue NaN;
String bcodmo_name "trace_metal_conc";
String description "One standard deviation of Co_D_CONC_FISH_s5r59b";
String long_name "SD1 Co D CONC FISH S5r59b";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "picomoles per kilogram (pmol/kg)";
}
Flag_Co_D_CONC_FISH_s5r59b {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 6;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Quality flag for Co_D_CONC_FISH_s5r59b";
String long_name "Flag Co D CONC FISH S5r59b";
String units "unitless";
}
L1Co_D_CONC_FISH_7wnxlt {
Float32 _FillValue NaN;
Float32 actual_range 0.0, 101.9;
String bcodmo_name "trace_metal_conc";
String description "Concentration of dissolved labile Co from tow fish";
String long_name "L1 Co D CONC FISH 7wnxlt";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "picomoles per kilogram (pmol/kg)";
}
SD1_L1Co_D_CONC_FISH_7wnxlt {
Float64 _FillValue NaN;
String bcodmo_name "trace_metal_conc";
String description "One standard deviation of L1Co_D_CONC_FISH_7wnxlt";
String long_name "SD1 L1 Co D CONC FISH 7wnxlt";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P03/current/C035/";
String units "picomoles per kilogram (pmol/kg)";
}
Flag_L1Co_D_CONC_FISH_7wnxlt {
Byte _FillValue 127;
String _Unsigned "false";
Byte actual_range 1, 6;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Quality flag for L1Co_D_CONC_FISH_7wnxlt";
String long_name "Flag L1 Co D CONC FISH 7wnxlt";
String units "unitless";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
String acquisition_description
"North and equatorial Pacific seawater samples were collected on the GP15
expedition as part of the U.S. GEOTRACES program (RR1804 and RR1805, September
to November 2018). Dissolved water samples were collected along a transect
that mostly followed the 152W meridian from 76N to 20S, traveling from the
Gulf of Alaska to Hawaii (Leg 1), and on to Tahiti, French Polynesia (Leg 2).
Sampling locations included 20 deep full-depth stations with a bottom depth of
over 4000 m, 5 shallow/coastal full-depth stations, and 10 surface stations
where only the surface 1000 m was sampled.
Dissolved seawater samples were collected using a 24-bottle trace metal clean
rosette equipped with 12 L Go-Flo bottles (General Oceanics), a titanium
frame, and a Kevlar cable, as described in (Cutter and Bruland 2012). Surface
water samples were collected from a trace metal clean towfish and pump while
arriving at each station. Seawater from the Go-Flo bottles was subsampled in a
trace metal clean van under positive pressure. Dissolved Co subsamples were
filtered using a 0.2 um Acropack (Pall) and stored until analysis at 4 degrees
C in a 60 mL LDPE bottle that had been soaked for ~1 week in Citranox, an
acidic detergent, rinsed with Milli-Q water (Millipore), soaked for ~2 weeks
in 10% trace metal grade HCl, and rinsed with lightly acidic Milli-Q water
(<0.1% HCl). All Co values were analyzed at sea, but replicates of all samples
were taken for future dCo analysis in the laboratory. Preserved samples were
filled entirely with no remaining headspace, stored with one oxygen-absorbing
satchel (Mitsubishi Gas Chemical, model RP-3K) per 60 mL water sample, vacuum-
sealed in plastic bags, and stored at 4 degrees C.
Dissolved cobalt was determined by cathodic stripping voltammetry (CSV) as
originally described by (Saito and Moffett 2001) and modified by (Saito et al.
2010; Hawco et al. 2016). Measurement occurred shipboard within a trace metal
clean plastic \\\"bubble\\\" within one week of sample collection using the
Metrohm 663 VA and uAutolabIII systems equipped with a hanging mercury drop
working electrode. For total dissolved Co (dCo) analysis, 0.2 um filtered
water samples were UV-irradiated in acid-washed quartz tubes for one hour
using a water-cooled UV irradiation system (Metrohm 705 UV Digestor) to
destroy natural ligand-bound Co complexes. For labile dissolved Co analysis
(L-dCo), no UV-irradiation was performed. Then, 11 mL of sample seawater was
aliquoted into 15 mL acid-washed polypropylene vials, and 33 uL of 0.1 M
dimethyglyoxime (DMG, Sigma Aldrich) and 130 uL of 0.5 M
N-(2-hydroxyethyl)piperazine-N-(3-propanesulfonic acid) (EPPS, Sigma Aldrich)
buffer was added. The samples were then processed on an autosampler (Metrohm
858 Sample Processor), which added 8.5 mL of the sample solution and 1.5 mL of
a 1.5 M NaNO\\u2082 reagent (Merck) to a Teflon cup for electrochemical
analysis. The mercury electrode performed a fast linear sweep from -1.4 V to
-0.6 V at a rate of 5 V s\\u207b\\u00b9, which reduced the Co bound in the
Co(DMG)\\u2082 complex from Co(II) to Co(0) and produced a Co reduction peak at
-1.15 V (Saito and Moffett 2001) with a height linearly proportional to the
amount of dCo present in the sample. A standard curve was created with 4
additions of 25 pM CoCl\\u2082 to each sample, and a linear regression of the
addition standard curve allowed for the calculation of the initial amount of
Co present in the sample, assuming all available Co binds to the DMG ligand.
Reagent purification protocols and standard addition calculations are outlined
in more detail in (Saito and Moffett 2001). Triplicate technical replicates
were run on every sample to determine the precision of the method, and
duplicate depths from different rosette casts were run when available.";
String awards_0_award_nid "785825";
String awards_0_award_number "OCE-1736599";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1736599";
String awards_0_funder_name "NSF Division of Ocean Sciences";
String awards_0_funding_acronym "NSF OCE";
String awards_0_funding_source_nid "355";
String awards_0_program_manager "Henrietta N Edmonds";
String awards_0_program_manager_nid "51517";
String cdm_data_type "Other";
String comment
"Dissolved Cobalt and Labile Cobalt
GEOTRACES PMT (GP15) Leg 1
PI: Mak Saito (WHOI)
Version date: 13-July-2020";
String Conventions "COARDS, CF-1.6, ACDD-1.3";
String creator_email "info@bco-dmo.org";
String creator_name "BCO-DMO";
String creator_type "institution";
String creator_url "https://www.bco-dmo.org/";
String data_source "extract_data_as_tsv version 2.3 19 Dec 2019";
String dataset_current_state "Final and no updates";
String date_created "2020-07-13T20:33:54Z";
String date_modified "2020-07-24T20:10:23Z";
String defaultDataQuery "&time<now";
String doi "10.26008/1912/bco-dmo.818383.1";
Float64 Easternmost_Easting -151.999;
Float64 geospatial_lat_max 56.059;
Float64 geospatial_lat_min 19.681;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -151.999;
Float64 geospatial_lon_min -156.962;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 5692.4;
Float64 geospatial_vertical_min 17.1;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"2024-11-23T17:24:29Z (local files)
2024-11-23T17:24:29Z https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_818383.html";
String infoUrl "https://www.bco-dmo.org/dataset/818383";
String institution "BCO-DMO";
String instruments_0_acronym "GO-FLO Teflon TM";
String instruments_0_dataset_instrument_description "Dissolved seawater samples were collected using a 24-bottle trace metal clean rosette equipped with 12 L Go-Flo bottles (General Oceanics), a titanium frame and a Kevlar cable, as described in (Cutter and Bruland 2012).";
String instruments_0_dataset_instrument_nid "818468";
String instruments_0_description "GO-FLO Teflon-lined Trace Metal free sampling bottles are used for collecting water samples for trace metal, nutrient and pigment analysis. The GO-FLO sampling bottle is designed specifically to avoid sample contamination at the surface, internal spring contamination, loss of sample on deck (internal seals), and exchange of water from different depths.";
String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/30/";
String instruments_0_instrument_name "GO-FLO Teflon Trace Metal Bottle";
String instruments_0_instrument_nid "533";
String instruments_0_supplied_name "Go-Flo bottles";
String instruments_1_acronym "GeoFish";
String instruments_1_dataset_instrument_description "Surface water samples were collected from a trace metal clean towfish and pump while arriving at each station.";
String instruments_1_dataset_instrument_nid "818469";
String instruments_1_description "The GeoFish towed sampler is a custom designed near surface (";
String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/31/";
String instruments_1_instrument_name "GeoFish Towed near-Surface Sampler";
String instruments_1_instrument_nid "549";
String instruments_1_supplied_name "trace metal clean towfish";
String instruments_2_acronym "Metrohm 663 VA";
String instruments_2_dataset_instrument_description "Measurement occurred shipboard within a trace metal clean plastic \"bubble\" within one week of sample collection using the Metrohm 663 VA and µAutolabIII systems equipped with a hanging mercury drop working electrode.";
String instruments_2_dataset_instrument_nid "818470";
String instruments_2_description "The Metrohm 663 VA stand forms the wet chemical part of a polarographic and voltammetric analytical system. It features a mercury electrode, an Ag/AgCl reference electrode and a glassy carbon counter electrode. The size of the mercury drop and the stirrer speed are set manually on the VA Stand. The VA Stand can be operated in Dropping Mercury Electrode (DME), Hanging Mercury Drop Electrode (HMDE) and Static Mercury Drop Electrode (SMDE) modes. The VA Stand can be controlled by a potentiostat in conjunction with the Metrohm IME663 interface.";
String instruments_2_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L22/current/TOOL0515/";
String instruments_2_instrument_name "Metrohm 663 VA Stand mercury electrode";
String instruments_2_instrument_nid "697";
String instruments_2_supplied_name "Metrohm 663 VA";
String instruments_3_acronym "Voltammetry Analyzers";
String instruments_3_dataset_instrument_description "Measurement occurred shipboard within a trace metal clean plastic \"bubble\" within one week of sample collection using the Metrohm 663 VA and µAutolabIII systems equipped with a hanging mercury drop working electrode.";
String instruments_3_dataset_instrument_nid "818471";
String instruments_3_description "Instruments that obtain information about an analyte by applying a potential and measuring the current produced in the analyte.";
String instruments_3_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB35/";
String instruments_3_instrument_name "Voltammetry Analyzers";
String instruments_3_instrument_nid "698";
String instruments_3_supplied_name "µAutolabIII";
String instruments_4_dataset_instrument_description "For total dissolved Co (dCo) analysis, 0.2 um filtered water samples were UV-irradiated in acid-washed quartz tubes for one hour using a water-cooled UV irradiation system (Metrohm 705 UV Digestor) to destroy natural ligand-bound Co complexes.";
String instruments_4_dataset_instrument_nid "818478";
String instruments_4_description "Digestion instrument for UV photolysis of water samples";
String instruments_4_instrument_name "UV Digester";
String instruments_4_instrument_nid "818477";
String instruments_4_supplied_name "Metrohm 705 UV Digestor";
String instruments_5_dataset_instrument_description "The samples were processed on an autosampler (Metrohm 858 Sample Processor), which added 8.5 mL of the sample solution and 1.5 mL of a 1.5 M NaNO2 reagent (Merck) to a Teflon cup for electrochemical analysis.";
String instruments_5_dataset_instrument_nid "818481";
String instruments_5_description "Laboratory apparatus that automatically introduces one or more samples with a predetermined volume or mass into an analytical instrument.";
String instruments_5_instrument_name "Laboratory Autosampler";
String instruments_5_instrument_nid "818479";
String instruments_5_supplied_name "Metrohm 858 Sample Processor";
String keywords "7wnxlt, bco, bco-dmo, biological, bottle, chemical, Co_D_CONC_BOTTLE_ifernt, Co_D_CONC_FISH_s5r59b, conc, data, dataset, date, depth, dmo, end, End_Date_UTC, End_ISO_DateTime_UTC, End_Latitude, End_Longitude, End_Time_UTC, erddap, event, Event_ID, fish, flag, Flag_Co_D_CONC_BOTTLE_ifernt, Flag_Co_D_CONC_FISH_s5r59b, Flag_L1Co_D_CONC_BOTTLE_v2phpz, Flag_L1Co_D_CONC_FISH_7wnxlt, ifernt, iso, L1Co_D_CONC_BOTTLE_v2phpz, L1Co_D_CONC_FISH_7wnxlt, latitude, longitude, management, oceanography, office, preliminary, s5r59b, sample, Sample_Depth, Sample_ID, sd1, SD1_Co_D_CONC_BOTTLE_ifernt, SD1_Co_D_CONC_FISH_s5r59b, SD1_L1Co_D_CONC_BOTTLE_v2phpz, SD1_L1Co_D_CONC_FISH_7wnxlt, start, Start_Date_UTC, Start_Time_UTC, station, Station_ID, time, v2phpz";
String license "https://www.bco-dmo.org/dataset/818383/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/818383";
Float64 Northernmost_Northing 56.059;
String param_mapping "{'818383': {'Start_ISO_DateTime_UTC': 'flag - time', 'Sample_Depth': 'flag - depth', 'Start_Longitude': 'flag - longitude', 'Start_Latitude': 'flag - latitude'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/818383/parameters";
String people_0_affiliation "Woods Hole Oceanographic Institution";
String people_0_affiliation_acronym "WHOI";
String people_0_person_name "Mak A. Saito";
String people_0_person_nid "50985";
String people_0_role "Principal Investigator";
String people_0_role_type "originator";
String people_1_affiliation "Woods Hole Oceanographic Institution";
String people_1_affiliation_acronym "WHOI";
String people_1_person_name "Rebecca Chmiel";
String people_1_person_nid "818387";
String people_1_role "Contact";
String people_1_role_type "related";
String people_2_affiliation "Woods Hole Oceanographic Institution";
String people_2_affiliation_acronym "WHOI BCO-DMO";
String people_2_person_name "Shannon Rauch";
String people_2_person_nid "51498";
String people_2_role "BCO-DMO Data Manager";
String people_2_role_type "related";
String project "U.S. GEOTRACES PMT,PMT Cobalt and Metalloenzymes";
String projects_0_acronym "U.S. GEOTRACES PMT";
String projects_0_description
"A 60-day research cruise took place in 2018 along a transect form Alaska to Tahiti at 152° W. A description of the project titled \"Collaborative Research: Management and implementation of the US GEOTRACES Pacific Meridional Transect\", funded by NSF, is below. Further project information is available on the US GEOTRACES website and on the cruise blog. A detailed cruise report is also available as a PDF.
Description from NSF award abstract:
GEOTRACES is a global effort in the field of Chemical Oceanography in which the United States plays a major role. The goal of the GEOTRACES program is to understand the distributions of many elements and their isotopes in the ocean. Until quite recently, these elements could not be measured at a global scale. Understanding the distributions of these elements and isotopes will increase the understanding of processes that shape their distributions and also the processes that depend on these elements. For example, many \"trace elements\" (elements that are present in very low amounts) are also important for life, and their presence or absence can play a vital role in the population of marine ecosystems. This project will launch the next major U.S. GEOTRACES expedition in the Pacific Ocean between Alaska and Tahiti. The award made here would support all of the major infrastructure for this expedition, including the research vessel, the sampling equipment, and some of the core oceanographic measurements. This project will also support the personnel needed to lead the expedition and collect the samples.
This project would support the essential sampling operations and infrastructure for the U.S. GEOTRACES Pacific Meridional Transect along 152° W to support a large variety of individual science projects on trace element and isotope (TEI) biogeochemistry that will follow. Thus, the major objectives of this management proposal are: (1) plan and coordinate a 60 day research cruise in 2018; (2) obtain representative samples for a wide variety of TEIs using a conventional CTD/rosette, GEOTRACES Trace Element Sampling Systems, and in situ pumps; (3) acquire conventional CTD hydrographic data along with discrete samples for salinity, dissolved oxygen, algal pigments, and dissolved nutrients at micro- and nanomolar levels; (4) ensure that proper QA/QC protocols are followed and reported, as well as fulfilling all GEOTRACES intercalibration protocols; (5) prepare and deliver all hydrographic data to the GEOTRACES Data Assembly Centre (via the US BCO-DMO data center); and (6) coordinate all cruise communications between investigators, including preparation of a hydrographic report/publication. This project would also provide baseline measurements of TEIs in the Clarion-Clipperton fracture zone (~7.5°N-17°N, ~155°W-115°W) where large-scale deep sea mining is planned. Environmental impact assessments are underway in partnership with the mining industry, but the effect of mining activities on TEIs in the water column is one that could be uniquely assessed by the GEOTRACES community. In support of efforts to communicate the science to a wide audience the investigators will recruit an early career freelance science journalist with interests in marine science and oceanography to participate on the cruise and do public outreach, photography and/or videography, and social media from the ship, as well as to submit articles about the research to national media. The project would also support several graduate students.";
String projects_0_end_date "2020-07";
String projects_0_geolocation "Pacific Meridional Transect along 152W (GP15)";
String projects_0_name "US GEOTRACES Pacific Meridional Transect";
String projects_0_project_nid "695926";
String projects_0_project_website "http://www.usgeotraces.org/USGEOTRACES_website/html/pacific-alaska.html";
String projects_0_start_date "2017-08";
String projects_1_acronym "PMT Cobalt and Metalloenzymes";
String projects_1_description
"NSF abstract:
Cobalt is important for many forms of marine life, yet it is one of the scarcest nutrients in the sea. Cobalt's oceanic abundance and distribution, along with other scarce nutrients, can influence the growth of microscopic plants (phytoplankton). This in turn can influence carbon cycles in the ocean and atmosphere. Therefore, knowledge of the controls on cobalt's abundance and chemical forms in seawater is a valuable component of our ability to understand the ocean's influence on global carbon cycling. Within phytoplankton and other marine microbes, metals such as cobalt, iron, nickel, and copper are used as critical components of enzymes responsible for key cellular reactions. Since these enzymes require metals to work, they are named metalloenzymes. Participating in a Pacific Ocean cruise from Alaska to Tahiti, this project will study the oceanic distributions of dissolved cobalt and the cellular content of a group of metalloenzymes known to influence biogeochemical cycles. The project will provide scientific impact by creating new knowledge about oceanic micronutrients in regions of economic interest with regard to fisheries and deep-sea mining. Measurement of proteins in the North Pacific will provide data of broad biological and chemical interest and will be made available through a new NSF-funded \"EarthCube Ocean Protein Portal\" data base. Educational impact will stem from participation of a graduate student and two young technicians, as well as the PI's development of a high school chemistry curriculum for use in two local high schools, thus allowing teachers to include real oceanic and environmental data at their first introduction to chemistry.
Cobalt has a complex biogeochemical cycle. Both its inorganic and organic forms are used by biology in the upper ocean and it is removed from solution by being scavenged in the intermediate and deep ocean. This scavenging removal results in cobalt having the smallest oceanic inventory of any biologically utilized element. Recent studies, however, have found that large dissolved cobalt plumes occur in major oxygen minimum zones due to a combination of less scavenging and additions from sedimentary and remineralization fluxes. The GP15 US GEOTRACES Pacific Meridional Transect (PMT) provides an opportunity to examine the influence of oxygen depletion on cobalt chemistry. Moreover, the study of the protein component of microbial communities using new proteomic techniques will provide evidence of how different major microorganisms respond to the chemical environment (e.g. through transporter production for specific nutrients and micronutrients) as well as the biochemical basis for metal requirements related to the use of specific metalloenzymes. Specifically, the PMT provides an opportunity to confirm that the Pacific oxygen minimum zones contain a large amount of cobalt and to test the hypotheses that simultaneous zinc scarcity could induce wide-scale biochemical substitution of cobalt for zinc in the North Pacific Ocean.";
String projects_1_end_date "2019-10";
String projects_1_geolocation "Laboratory Study and Cultures from Northeast Pacific Line P Transect 48.8167 N 128.667 W";
String projects_1_name "US GEOTRACES PMT: Cobalt Biogeochemical Cycling and Connections to Metalloenzymes in the Pacific Ocean";
String projects_1_project_nid "785826";
String projects_1_start_date "2017-11";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
Float64 Southernmost_Northing 19.681;
String standard_name_vocabulary "CF Standard Name Table v55";
String subsetVariables "End_Latitude,End_Longitude,SD1_Co_D_CONC_BOTTLE_ifernt,SD1_L1Co_D_CONC_BOTTLE_v2phpz,SD1_Co_D_CONC_FISH_s5r59b,SD1_L1Co_D_CONC_FISH_7wnxlt";
String summary "Dissolved Cobalt and Labile Cobalt from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018.";
String time_coverage_end "2018-10-21T12:21Z";
String time_coverage_start "2018-09-24T06:38Z";
String title "[GP15 Dissolved and Labile Cobalt Leg 1] - Dissolved Cobalt and Labile Cobalt from Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018 (US GEOTRACES Pacific Meridional Transect)";
String version "1";
Float64 Westernmost_Easting -156.962;
String xml_source "osprey2erddap.update_xml() v1.5";
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}
Data Access Protocol (DAP) and its
selection constraints.
The URL specifies what you want: the dataset, a description of the graph or the subset of the data, and the file type for the response.
Tabledap request URLs must be in the form
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/datasetID.fileType{?query}
For example,
https://coastwatch.pfeg.noaa.gov/erddap/tabledap/pmelTaoDySst.htmlTable?longitude,latitude,time,station,wmo_platform_code,T_25&time>=2015-05-23T12:00:00Z&time<=2015-05-31T12:00:00Z
Thus, the query is often a comma-separated list of desired variable names,
followed by a collection of
constraints (e.g., variable<value),
each preceded by '&' (which is interpreted as "AND").
For details, see the tabledap Documentation.