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| Dataset Title: | 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 
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| Institution: | BCO-DMO (Dataset ID: bcodmo_dataset_818707) |
| Range: | longitude = -128.0 to -112.75°E, latitude = -15.0 to -11.671°N, depth = 2000.8 to 2610.2m, time = 2013-11-21T01:19Z to 2013-12-04T06:41Z |
| Information: | Summary
| License
| ISO 19115
| Metadata
| Background
| Subset
| Data Access Form
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Attributes {
s {
cruise {
String bcodmo_name "cruise_id";
String description "Cruise identifier";
String long_name "Cruise";
String units "unitless";
}
station_no {
Byte _FillValue 127;
Byte actual_range 18, 26;
String bcodmo_name "station";
String description "Station number";
String long_name "Station No";
String units "unitless";
}
cast_no {
Byte _FillValue 127;
Byte actual_range 1, 11;
String bcodmo_name "cast";
String description "Cast number";
String long_name "Cast No";
String units "unitless";
}
event_no {
Int16 _FillValue 32767;
Int16 actual_range 4233, 4343;
String bcodmo_name "event";
String description "Event number";
String long_name "Event No";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/EVTAGFL/";
String units "unitless";
}
geotraces_no {
String bcodmo_name "sample";
String description "GEOTRACES sample number";
String long_name "Geotraces No";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P02/current/ACYC/";
String units "unitless";
}
date {
String bcodmo_name "date_utc";
String description "Sampling date (UTC); format: YYYY-MM-DD";
String long_name "Date";
String time_precision "1970-01-01";
String units "unitless";
}
time2 {
String bcodmo_name "time_utc";
String description "Sampling time (UTC); format: hh:mm";
String long_name "Time";
String units "unitless";
}
time {
String _CoordinateAxisType "Time";
Float64 actual_range 1.38499674e+9, 1.38613926e+9;
String axis "T";
String bcodmo_name "ISO_DateTime_UTC";
String description "Sampling date and time (UTC) formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ";
String ioos_category "Time";
String long_name "ISO Date Time UTC";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P01/current/DTUT8601/";
String source_name "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";
}
latitude {
String _CoordinateAxisType "Lat";
Float64 _FillValue NaN;
Float64 actual_range -15.0, -11.671;
String axis "Y";
String bcodmo_name "latitude";
Float64 colorBarMaximum 90.0;
Float64 colorBarMinimum -90.0;
String description "Latitude";
String ioos_category "Location";
String long_name "Latitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LATX/";
String standard_name "latitude";
String units "degrees_north";
}
longitude {
String _CoordinateAxisType "Lon";
Float64 _FillValue NaN;
Float64 actual_range -128.0, -112.75;
String axis "X";
String bcodmo_name "longitude";
Float64 colorBarMaximum 180.0;
Float64 colorBarMinimum -180.0;
String description "Longitude";
String ioos_category "Location";
String long_name "Longitude";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/LONX/";
String source_name "long";
String standard_name "longitude";
String units "degrees_east";
}
depth {
String _CoordinateAxisType "Height";
String _CoordinateZisPositive "down";
Float64 _FillValue NaN;
Float64 actual_range 2000.8, 2610.2;
String axis "Z";
String bcodmo_name "depth";
String description "Depth measured by CTD";
String ioos_category "Location";
String long_name "Ctd Depth";
String nerc_identifier "https://vocab.nerc.ac.uk/collection/P09/current/DEPH/";
String positive "down";
String standard_name "depth";
String units "m";
}
dFe_conc {
Float32 _FillValue NaN;
Float32 actual_range 0.629, 8.742;
String bcodmo_name "Fe";
String description "Dissolved Fe concentration (";
String long_name "D Fe Conc";
String units "nanomoles per kilogram (nmol kg-1)";
}
dFe_conc_error {
Float32 _FillValue NaN;
Float32 actual_range 0.031, 0.437;
String bcodmo_name "Fe";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "1 std. deviation error on dissolved Fe concentration";
String long_name "D Fe Conc Error";
String units "nanomoles per kilogram (nmol kg-1)";
}
dFe_conc_flag {
Byte _FillValue 127;
Byte actual_range 2, 2;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Quality flag for dissolved Fe concentration (SeaDataNet scheme)";
String long_name "D Fe Conc Flag";
String units "unitless";
}
sFe_conc {
Float32 _FillValue NaN;
Float32 actual_range 0.257, 4.88;
String bcodmo_name "Fe";
String description "Soluble Fe concentration (";
String long_name "S Fe Conc";
String units "nanomoles per kilogram (nmol kg-1)";
}
sFe_conc_error {
Float32 _FillValue NaN;
Float32 actual_range 0.0129, 0.244;
String bcodmo_name "Fe";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "1 std. deviation error on soluble Fe concentration";
String long_name "S Fe Conc Error";
String units "nanomoles per kilogram (nmol kg-1)";
}
sFe_conc_flag {
Byte _FillValue 127;
Byte actual_range 2, 2;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Quality flag for soluble Fe concentration (SeaDataNet scheme)";
String long_name "S Fe Conc Flag";
String units "unitless";
}
delta_56_dFe {
Float32 _FillValue NaN;
Float32 actual_range -0.2, 0.54;
String bcodmo_name "Fe";
String description "Dissolved 56/54 Fe isotope ratio (";
String long_name "Delta 56 D Fe";
String units "per mil (‰)";
}
delta_56_dFe_error {
Float32 _FillValue NaN;
Float32 actual_range 0.02, 0.1;
String bcodmo_name "Fe";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "2 std. deviation error on dissolved 56/54 Fe isotope ratio";
String long_name "Delta 56 D Fe Error";
String units "per mil (‰)";
}
delta_56_dFe_flag {
Byte _FillValue 127;
Byte actual_range 2, 2;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Quality flag for dissolved Fe isotope ratio (SeaDataNet scheme)";
String long_name "Delta 56 D Fe Flag";
String units "unitless";
}
delta_56_sFe {
Float32 _FillValue NaN;
Float32 actual_range 0.09, 0.68;
String bcodmo_name "Fe";
String description "Soluble 56/54 Fe isotope ratio (";
String long_name "Delta 56 S Fe";
String units "per mil (‰)";
}
delta_56_sFe_error {
Float32 _FillValue NaN;
Float32 actual_range 0.03, 0.1;
String bcodmo_name "Fe";
Float64 colorBarMaximum 50.0;
Float64 colorBarMinimum 0.0;
String description "2 std. deviation error on soluble 56/54 Fe isotope ratio";
String long_name "Delta 56 S Fe Error";
String units "per mil (‰)";
}
delta_56_sFe_flag {
Byte _FillValue 127;
Byte actual_range 2, 2;
String bcodmo_name "q_flag";
Float64 colorBarMaximum 150.0;
Float64 colorBarMinimum 0.0;
String description "Quality flag for soluble Fe isotope ratio (SeaDataNet scheme)";
String long_name "Delta 56 S Fe Flag";
String units "unitless";
}
}
NC_GLOBAL {
String access_formats ".htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson,.odvTxt";
String acquisition_description
"Sample Collection and Filtration
All seawater samples analyzed here for dissolved iron (dFe) concentration
and isotope ratios (\\u03b456Fe) were collected between 21 November and 4
December 2013 aboard the R/V Thomas G. Thompson as part of the U.S. GEOTRACES
GP16 East Pacific Zonal Transect (Resing et al. 2015, Fitzsimmons et al. 2017,
John et al. 2018). The EPZT encompassed 35 stations along an 8000 km transect
that traversed from Peru to Tahiti (Peters et al. 2017, Moffett & German
2018). All seawater samples were collected as part of the standard U.S.
GEOTRACES trace metal casts, using a trace metal clean carousel and CTD
(Seabird) with a Kevlar conducting cable, fitted with 24 x 12-L Teflon-coated
GO-Flo bottles (General Oceanics), following established GEOTRACES protocols
(Cutter & Bruland 2012). Rosette deployments began with GO-Flo bottles open,
allowing them to flush during deployment to depth, and the GO-Flo bottle was
subsequently tripped on ascent at ~3 m/min, to minimize chances of
contamination from rosette hardware. Upon recovery, GO-Flo bottles were
transferred immediately into a clean van for subsampling and were pressurized
using HEPA-filtered air. Each GO-Flo bottle was fitted with acid-cleaned
Teflon tubing connected to a 0.2 um Acropak-200 capsule filter (Pall),
allowing collection of filtered seawater for bulk dissolved Fe analysis into 4
L acid-clean low-density polyethylene (LDPE) bottles, after three 10% volume
seawater rinses of the caps and threads (Cutter et al. 2017). Filtered
seawater from Station 26 at 2650 m and 2700 m depths were combined to achieve
sufficient volume for ultrafiltration processing.
Ultrafiltration and Sample Processing
Immediately after sample collection and 0.2 um filtration, 1 L of the 4 L
homogenized sample was poured into a clean 1 L LDPE bottle for dissolved Fe
analysis, and the remaining sample (~ 3 L) was ultrafiltered. Ultrafiltration
took place using a cross flow filtration system (CFF) with a 10 kDa (~0.003 um
for globular proteins; Erickson et al. 2009) regenerated cellulose membrane
(Pellicon XL PLCGC) in single-pass mode (see Fitzsimmons and Boyle 2014 for
detailed methods). Briefly, before collection, the CFF system was conditioned
using ~500 mL of sample seawater, and the sample bottles, caps, and threads
were rinsed with a minimal amount of ultrafiltered seawater. After
conditioning, ~1 L of permeate (soluble fraction) and ~1 L of retentate were
collected into separate 1 L LDPE bottles. All samples were then acidified to
0.012 M hydrochloric acid (HCl, Optima, Fisher) and stored for more than a
year before analysis. Soluble Fe (sFe) is defined as the concentration in the
permeate solution.
Dissolved Fe Concentration Analysis
Iron concentrations in the dissolved, permeate, and retentate phases were
analyzed using a 15 mL aliquot of the 1 L samples. Samples were analyzed in
the Sherrell lab at Rutgers University with a SeaFAST pico system (ESI, Omaha,
NE, USA) and Thermo Element 1 HR-ICPMS following the SeaFAST methods of
Lagerstrom et al. (2013). Samples were analyzed offline, as outlined by Jensen
et al. (2020).
Dissolved Fe isotope ratio (\\u03b456Fe) Analysis
Iron stable isotope ratios (\\u03b456Fe) were determined using a double-spike
multi-collector MC-ICPMS technique, based on Conway et al. (2013). All sample
processing and Fe isotope analyses were carried out at the University of South
Florida (USF). Chemical processing of samples took place in ISO-5 laminar flow
hoods within the Marine Metal Isotope and Trace Element ISO-6 clean laboratory
at the USF College of Marine Science. All ultrapure water used was from a
Thermo Scientific Barnstead Genpure Ultrapure Water System; all plasticware
was cleaned using standard procedures (Conway et al. 2013); and all reagents
were Optima grade from Fisher Scientific. Briefly, the ~1 L of dissolved,
permeate, and retentate seawater samples were spiked with a double spike
containing 57Fe and 58Fe at a ratio of ~1:1, to provide a ~1:2 ratio of
natural:spike Fe in samples. Following spiking, samples were amended to 10 mM
H\\u2082O\\u2082 and left for 24 h after spiking. Samples were then brought to
pH ~6, and Fe was extracted from seawater onto Nobias PA-1 chelating resin
beads using a batch extraction technique. The Fe was then eluted from the
Nobias resin using 3 M HNO\\u2083, evaporated to dryness, refluxed with a conc.
HNO\\u2083 and conc. H\\u2082O\\u2082 mixture, evaporated to dryness, taken up in
1 M HCl, and purified using an AGMP-1 (BioRad) anion-exchange column chemistry
technique following Sieber et al. (2019). Following column purification,
samples were evaporated to dryness before being re-dissolved in 0.5 mL of 2%
HNO\\u2083 (v/v) for analysis by MC-ICPMS.
Samples were analyzed for Fe isotope ratios by Thermo Neptune Plus MC-ICPMS at
USF\\u2019s Tampa Bay Plasma Facility at the USF College of Marine Science.
Briefly, samples were introduced via a ~100 \\u00b5L/min PFA nebulizer into an
ESI Apex \\u03a9 desolvator (with Ar but no N\\u2082 add gas), using a Ni Jet
sampler cone and an Al X skimmer cone. Fe isotope ratios were measured using
high resolution mode, and instrumental mass bias was corrected using the
double spike technique. \\u03b456Fe were calculated following an iterative
procedure based on Siebert et al. (2001) and are expressed relative to the
IRMM-014 international standard.
Problem report: Filtered seawater from Station 26 at 2650 m and 2700 m depths
were combined to achieve sufficient volume for ultrafiltration processing.";
String awards_0_award_nid "640077";
String awards_0_award_number "OCE-1234827";
String awards_0_data_url "http://www.nsf.gov/awardsearch/showAward?AWD_ID=1234827";
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 awards_1_award_nid "787554";
String awards_1_award_number "OCE-1713677";
String awards_1_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1713677";
String awards_1_funder_name "NSF Division of Ocean Sciences";
String awards_1_funding_acronym "NSF OCE";
String awards_1_funding_source_nid "355";
String awards_1_program_manager "Henrietta N Edmonds";
String awards_1_program_manager_nid "51517";
String awards_2_award_nid "787559";
String awards_2_award_number "OCE-1434493";
String awards_2_data_url "http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1434493";
String awards_2_funder_name "NSF Division of Ocean Sciences";
String awards_2_funding_acronym "NSF OCE";
String awards_2_funding_source_nid "355";
String awards_2_program_manager "Henrietta N Edmonds";
String awards_2_program_manager_nid "51517";
String cdm_data_type "Other";
String comment
"Soluble & Dissolved Fe & Fe Isotopes
US GEOTRACES EPZT (GP16, TN303)
PI: Jessica Fitzsimmons & Janelle Steffen (TAMU)
Co-PIs: Tim Conway (USF) & Robert Sherrell (Rutgers)
Version date: 16 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 "2020-07-15T21:01:55Z";
String date_modified "2020-07-16T23:32:51Z";
String defaultDataQuery "&time<now";
String doi "10.26008/1912/bco-dmo.818707.1";
Float64 Easternmost_Easting -112.75;
Float64 geospatial_lat_max -11.671;
Float64 geospatial_lat_min -15.0;
String geospatial_lat_units "degrees_north";
Float64 geospatial_lon_max -112.75;
Float64 geospatial_lon_min -128.0;
String geospatial_lon_units "degrees_east";
Float64 geospatial_vertical_max 2610.2;
Float64 geospatial_vertical_min 2000.8;
String geospatial_vertical_positive "down";
String geospatial_vertical_units "m";
String history
"2024-04-20T03:48:25Z (local files)
2024-04-20T03:48:25Z https://erddap.bco-dmo.org/tabledap/bcodmo_dataset_818707.das";
String infoUrl "https://www.bco-dmo.org/dataset/818707";
String institution "BCO-DMO";
String instruments_0_acronym "CTD Sea-Bird";
String instruments_0_dataset_instrument_description "Trace metal clean carousel and CTD (Seabird) with a Kevlar conducting cable, fitted with 24 x 12-L Teflon-coated GO-Flo bottles (General Oceanics), was used to collect water and depth measurements following established GEOTRACES protocols.";
String instruments_0_dataset_instrument_nid "818799";
String instruments_0_description "Conductivity, Temperature, Depth (CTD) sensor package from SeaBird Electronics, no specific unit identified. This instrument designation is used when specific make and model are not known. See also other SeaBird instruments listed under CTD. More information from Sea-Bird Electronics.";
String instruments_0_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/130/";
String instruments_0_instrument_name "CTD Sea-Bird";
String instruments_0_instrument_nid "447";
String instruments_0_supplied_name "Trace metal clean carousel and CTD (Seabird)";
String instruments_1_acronym "ICP Mass Spec";
String instruments_1_dataset_instrument_description "Iron concentrations were analyzed in the Sherrell lab using a SeaFAST pico system (ESI, Omaha, NE, USA) and Thermo-Finnigan Element 1 HR-ICPMS following the SeaFAST methods of Lagerstrom et al., (2013).";
String instruments_1_dataset_instrument_nid "818800";
String instruments_1_description "An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer.";
String instruments_1_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB15/";
String instruments_1_instrument_name "Inductively Coupled Plasma Mass Spectrometer";
String instruments_1_instrument_nid "530";
String instruments_1_supplied_name "Thermo-Finnigan Element 1 HR-ICPMS";
String instruments_2_acronym "ICP Mass Spec";
String instruments_2_dataset_instrument_description "Samples were analyzed for Fe isotope ratios by Thermo Neptune Plus MC-ICPMS at USF’s Tampa Bay Plasma Facility at the USF College of Marine Science.";
String instruments_2_dataset_instrument_nid "818801";
String instruments_2_description "An ICP Mass Spec is an instrument that passes nebulized samples into an inductively-coupled gas plasma (8-10000 K) where they are atomized and ionized. Ions of specific mass-to-charge ratios are quantified in a quadrupole mass spectrometer.";
String instruments_2_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/LAB15/";
String instruments_2_instrument_name "Inductively Coupled Plasma Mass Spectrometer";
String instruments_2_instrument_nid "530";
String instruments_2_supplied_name "Thermo Neptune Plus MC-ICPMS";
String instruments_3_acronym "GO-FLO Teflon TM";
String instruments_3_dataset_instrument_description "A trace metal clean carousel and CTD (Seabird) with a Kevlar conducting cable, fitted with 24 x 12-L Teflon-coated GO-Flo bottles (General Oceanics), was used to collect water and depth measurements following established GEOTRACES protocols.";
String instruments_3_dataset_instrument_nid "818798";
String instruments_3_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_3_instrument_external_identifier "https://vocab.nerc.ac.uk/collection/L05/current/30/";
String instruments_3_instrument_name "GO-FLO Teflon Trace Metal Bottle";
String instruments_3_instrument_nid "533";
String instruments_3_supplied_name "Teflon-coated GO-Flo bottles (General Oceanics)";
String keywords "bco, bco-dmo, biological, cast, cast_no, chemical, conc, conductivity, cruise, ctd, ctd_depth, data, dataset, date, delta, delta_56_dFe, delta_56_dFe_error, delta_56_dFe_flag, delta_56_sFe, delta_56_sFe_error, delta_56_sFe_flag, depth, dFe_conc, dFe_conc_error, dFe_conc_flag, dmo, erddap, error, event, event_no, flag, geotraces, geotraces_no, iso, latitude, longitude, management, oceanography, office, preliminary, sFe_conc, sFe_conc_error, sFe_conc_flag, sonde, station, station_no, temperature, time, time2";
String license "https://www.bco-dmo.org/dataset/818707/license";
String metadata_source "https://www.bco-dmo.org/api/dataset/818707";
Float64 Northernmost_Northing -11.671;
String param_mapping "{'818707': {'ctd_depth': 'flag - depth', 'lat': 'flag - latitude', 'long': 'flag - longitude', 'ISO_DateTime_UTC': 'flag - time'}}";
String parameter_source "https://www.bco-dmo.org/mapserver/dataset/818707/parameters";
String people_0_affiliation "Texas A&M University";
String people_0_affiliation_acronym "TAMU";
String people_0_person_name "Jessica N. Fitzsimmons";
String people_0_person_nid "51632";
String people_0_role "Principal Investigator";
String people_0_role_type "originator";
String people_1_affiliation "University of South Florida";
String people_1_affiliation_acronym "USF";
String people_1_person_name "Timothy M. Conway";
String people_1_person_nid "51623";
String people_1_role "Co-Principal Investigator";
String people_1_role_type "originator";
String people_2_affiliation "Rutgers University";
String people_2_person_name "Robert M. Sherrell";
String people_2_person_nid "50919";
String people_2_role "Co-Principal Investigator";
String people_2_role_type "originator";
String people_3_affiliation "Texas A&M University";
String people_3_affiliation_acronym "TAMU";
String people_3_person_name "Janelle M. Steffen";
String people_3_person_nid "818841";
String people_3_role "Student";
String people_3_role_type "related";
String people_4_affiliation "Woods Hole Oceanographic Institution";
String people_4_affiliation_acronym "WHOI BCO-DMO";
String people_4_person_name "Shannon Rauch";
String people_4_person_nid "51498";
String people_4_role "BCO-DMO Data Manager";
String people_4_role_type "related";
String project "U.S. GEOTRACES EPZT,GEOTRACES EPZT Suspended Particles";
String projects_0_acronym "U.S. GEOTRACES EPZT";
String projects_0_description
"From the NSF Award Abstract
The mission of the International GEOTRACES Program (www.geotraces.org), of which the U.S. chemical oceanography research community is a founding member, is \"to identify processes and quantify fluxes that control the distributions of key trace elements and isotopes in the ocean, and to establish the sensitivity of these distributions to changing environmental conditions\" (GEOTRACES Science Plan, 2006). In the United States, ocean chemists are currently in the process of organizing a zonal transect in the eastern tropical South Pacific (ETSP) from Peru to Tahiti as the second cruise of the U.S.GEOTRACES Program. This Pacific section includes a large area characterized by high rates of primary production and particle export in the eastern boundary associated with the Peru Upwelling, a large oxygen minimum zone that is a major global sink for fixed nitrogen, and a large hydrothermal plume arising from the East Pacific Rise. This particular section was selected as a result of open planning workshops in 2007 and 2008, with a final recommendation made by the U.S.GEOTRACES Steering Committee in 2009. It is the first part of a two-stage plan that will include a meridional section of the Pacific from Tahiti to Alaska as a subsequent expedition.
This award provides funding for management of the U.S.GEOTRACES Pacific campaign to a team of scientists from the University of Southern California, Old Dominion University, and the Woods Hole Oceanographic Institution. The three co-leaders will provide mission leadership, essential support services, and management structure for acquiring the trace elements and isotopes samples listed as core parameters in the International GEOTRACES Science Plan, plus hydrographic and nutrient data needed by participating investigators. With this support from NSF, the management team will (1) plan and coordinate the 52-day Pacific research cruise described above; (2) obtain representative samples for a wide variety of trace metals of interest using conventional CTD/rosette and GEOTRACES Sampling Systems; (3) acquire conventional JGOFS/WOCE-quality hydrographic data (CTD, transmissometer, fluorometer, oxygen sensor, etc) along with discrete samples for salinity, dissolved oxygen (to 1 uM detection limits), plant pigments, redox tracers such as ammonium and nitrite, 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-type data to the GEOTRACES Data Center (and US data centers); and (6) coordinate cruise communications between all participating investigators, including preparation of a hydrographic report/publication.
Broader Impacts: The project is part of an international collaborative program that has forged strong partnerships in the intercalibration and implementation phases that are unprecedented in chemical oceanography. The science product of these collective missions will enhance our ability to understand how to interpret the chemical composition of the ocean, and interpret how climate change will affect ocean chemistry. Partnerships include contributions to the infrastructure of developing nations with overlapping interests in the study area, in this case Peru. There is a strong educational component to the program, with many Ph.D. students carrying out thesis research within the program.
Figure 1. The 2013 GEOTRACES EPZT Cruise Track. [click on the image to view a larger version]";
String projects_0_end_date "2015-06";
String projects_0_geolocation "Eastern Tropical Pacific - Transect from Peru to Tahiti";
String projects_0_name "U.S. GEOTRACES East Pacific Zonal Transect";
String projects_0_project_nid "499723";
String projects_0_project_website "http://www.geotraces.org/";
String projects_0_start_date "2012-06";
String projects_1_acronym "GEOTRACES EPZT Suspended Particles";
String projects_1_description
"During the 2013 GEOTRACES Eastern Pacific cruise a diverse range of oceanic environments will be encountered from the high productivity/high particle flux waters off Peru to the Peru-Chile oxygen minimum zone, the hydrothermal plume of the East Pacific Rise, and finally to some of the most oligotrophic waters around Tahiti. Scientists from Rutgers University and Woods Hole Oceanographic Institution will sample suspended particulates from the same GO-Flo bottles that will be used to sample dissolved trace metals and their isotopes (TEIs) across this entire transect. The suspended matter samples will be analyzed for 42 elements, including the particle-reactive rare earth elements. In addition, core-top sediments will be collected at every water-column sampling station and analyzed for both bulk composition (i.e., relative % content of organic carbon, opal, biogenic carbonate and lithogenic components) and the same 42 elements to be analyzed in the suspended particulates. Results from this study will be used to assess the role of suspended particulates in the biogeochemical cycling of TEIs across the Eastern Pacific by addressing three key sets of questions: (1) How does uptake of TEIs into phytoplankton and non-living particles in the upper ocean drive the suspended particulate composition through the deeper water column, along the substantial gradient from the high productivity Peru margin to the oligotrophic ocean interior?; (2) How faithfully is the along-transect variability in the upper ocean transmitted to the sediment (paleo) record?; (3) What are the relative influences of vertical recycling versus lateral advection in generating the distributions of dissolved and particulate TEIs observed in the Peru-Chile OMZ?; (4) Is there a characteristic signature of OMZ activity that is preserved in core-top sediments?; (5) What dominates TEI uptake onto/into authigenic particles in hydrothermal plumes and to what extent are these processes augmented by continuing uptake in core-top sediments?; and (6) What is the net effect from submarine venting on global TEI budgets?
As regards broader impacts, the scientist from Rutgers University is collaborating with the Education Director of the Centers for Ocean Science Education Excellence Networked Ocean World (COSEE-NOW) to contribute to the MARE (Marine Activities, Resources, and Education) program by inviting teachers and high school students to workshops and presentations on climate and ocean sciences. With the help of COSEE-NOW, he also plans to create educational video clips during the Pacific cruise and the subsequent laboratory based analytical work to educate them on the use of geochemistry to understand how the ocean works. Both scientists also plan to develop a teaching module entitled \"Particles, Metals, and Carbon\" for an Introduction to Oceanography class taught by the Rutgers scientist. One postdoc from Rutgers University would be supported and trained as part of this project.";
String projects_1_end_date "2016-12";
String projects_1_geolocation "Subtropical Southeastern Pacific Ocean";
String projects_1_name "GEOTRACES: Suspended particle geochemistry along the US GEOTRACES Eastern Pacific Zonal Transect, from high productivity ocean margin to deep sea hydrothermal plume";
String projects_1_project_nid "640083";
String projects_1_start_date "2013-01";
String publisher_name "Biological and Chemical Oceanographic Data Management Office (BCO-DMO)";
String publisher_type "institution";
String sourceUrl "(local files)";
Float64 Southernmost_Northing -15.0;
String standard_name_vocabulary "CF Standard Name Table v55";
String subsetVariables "cruise,dFe_conc_flag,sFe_conc_flag,delta_56_dFe_flag,delta_56_sFe_flag";
String 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.";
String time_coverage_end "2013-12-04T06:41Z";
String time_coverage_start "2013-11-21T01:19Z";
String title "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";
String version "1";
Float64 Westernmost_Easting -128.0;
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.