19:I[42426,["/_next/static/immutable/chunks/1xctgzqre-wsy.js","/_next/static/immutable/chunks/06_-wz6pdtp2b.js","/_next/static/immutable/chunks/30e52g49hg40p.js","/_next/static/immutable/chunks/02yq6tul2z-oh.js","/_next/static/immutable/chunks/10bx_ec2vj7n_.js","/_next/static/immutable/chunks/33bfn03fo8xnt.js","/_next/static/immutable/chunks/0tfjf78scu61b.js","/_next/static/immutable/chunks/31xnvej4n1bi9.js"],"default"] 1a:T133b,

Water column samples were taken from the GEOTRACES carousel and filtered through pre-cleaned, 0.2 um Pall Acropak Supor filter capsules as described elsewhere (e.g., Cutter et al., 2012; Hatta et al., 2015). Near surface water samples were collected using an underway towed-fish pumped seawater system (Bruland et al., 2005) with samples filtered through sequential 0.45 um Osmonics and 0.2 um Polycarbonate (PCTE) cartridge filters. Filtered water was collected in 125 mL HDPE bottles (Nalgene) that had been precleaned by soaking in hot 1.2 M HCl (reagent grade) for at least 8 h with subsequent thorough rinsing with ultrapure distilled deionized water (Barnstead E-pure). Samples were acidified in a laminar flow bench aboard ship using 0.5 mL of ultrapure HCl per 125 mL sample.

Molybdenum, was measured using a ThermoFisher Element 2 Inductively Coupled Plasma Mass Spectrometer (ICP-MS) using an isotope dilution method similar to the one described for Ba by Jacquet et al. (2005). Aliquots (50 uL) of each sample were spiked with 25 uL of a 95Mo-enriched solution (~770 nM) and then diluted 30-fold with 0.2 um ultrapure filtered water. A sample of 96.8% enriched 95Mo was obtained from Oak Ridge National Laboratories for use as the enriched isotope spike. The ICP-MS was operated in low resolution and both 95Mo and 98Mo were determined. The samples were bracketed every 10 samples with a blank and the spike 95Mo solution. The volumes of the spikes, samples, and dilution water were accurately assessed by calibrating each pipette by weight. The reproducibility error of this method was estimated by comparing samples collected at the same depths on different casts at the same station. For 31 pairs of these replicate samples, the average absolute deviation was 2.3 nmol/kg or typically 2.1%. Repeated runs of runs of US GEOTRACES intercalibration samples and in-house reference solutions suggest a precision of ±2.3%; the limit of detection for molybdenum was ~1 nmol/kg.

Additional Information (including references) can be found in GEOTRACES Intercalibration Document

Additional GEOTRACES Processing:

As was done for the GEOTRACES-NAT data, BCO-DMO added standard US GEOTRACES information, such as the US GEOTRACES event number, to each submitted dataset lacking this information. To accomplish this, BCO-DMO compiled a 'master' dataset composed of the following parameters:

cruise_id, EXPOCODE,SECT_ID, STNNBR, CASTNO, GEOTRC_EVENTNO, GEOTRC_SAMPNO, GEOTRC_INSTR, SAMPNO, GF_NO, BTLNBR, BTLNBR_FLAG_W, DATE_START_EVENT, TIME_START_EVENT, ISO_DATETIME_UTC_START_EVENT, EVENT_LAT, EVENT_LON, DEPTH_MIN, DEPTH_MAX, BTL_DATE, BTL_TIME, BTL_ISO_DATETIME_UTC, BTL_LAT, BTL_LON, ODF_CTDPRS, SMDEPTH, FMDEPTH, BTMDEPTH, CTDPRS, CTDDEPTH.

This added information will facilitate subsequent analysis and inter comparison of the datasets.

Bottle parameters in the master file were taken from the GT-C_Bottle and ODF_Bottle datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the TN303 Event Log (version 30 Oct 2014). Where applicable, pump information was taken from the PUMP_Nuts_Sals dataset.

A standardized BCO-DMO method (called "join") was then used to merge the missing parameters to each US GEOTRACES dataset, most often by matching on sample_GEOTRC or on some unique combination of other parameters.

If the master parameters were included in the original data file and the values did not differ from the master file, the original data columns were retained and the names of the parameters were changed from the PI-submitted names to the standardized master names. If there were differences between the PI-supplied parameter values and those in the master file, both columns were retained. If the original data submission included all of the master parameters, no additional columns were added, but parameter names were modified to match the naming conventions of the master file.

See the dataset parameters documentation for a description of which parameters were supplied by the PI and which were added via the join method.

BCO-DMO Processing:
- molybdenum concentration MO_D_CONC_BOTTLE and MO_D_CONC_FISH rounded to one decimal place
- modified parameter names to conform with BCO-DMO and GEOTRACES naming conventions
- split GeoFISH data and bottle sample data into separate columns so GEOTRACES naming conventions of _BOTTLE and _FISH would be appropriate
- replaced blanks (missing data) with 'nd' ('no data')
- New data version 10 Nov 2016: Removed a duplicate line for sample number 3494
- 04 March 2019: removed embargo on dataset.

1b:Tdf7,From the NSF Award Abstract The mission of the International GEOTRACES Program (https://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]1c:T69f,Extracted from the NSF award abstract: During the 2013 GEOTRACES Eastern Pacific Zonal Section cruise, a scientist from the University of Southern Mississippi will determine the distributions of gallium (Ga) and vanadium (V), as well as V redox speciation. The planned cruise track is ideal for this effort because it will traverse various oceanic environments that influence the biogeochemistry of these elements namely, the Peru margin/upwelling zone and the associated oxygen minimum zone, gradients in atmospheric inputs and biological productivity from the Peru margin to Tahiti, and hydrothermal vents along the East Pacific Rise. Specific goals of the project include: (1) examine the discrepancy between surface water Ga and aluminum (Al) distributions and estimate dust inputs; (2) confirm the relationship observed in the North Pacific between the surface ocean Ga/Al ratio and the chlorophyll distribution; (3) compare the surface ocean manganese distribution with that of Ga, Al, and lead to differentiate between shelf and aerosol inputs; (4) determine if there is evidence of shelf V removal which contributes to the surface ocean V depletion; (5) test for hydrothermal influences on the V distribution downstream from the East Pacific Rise; and (6) compare V redox speciation with that of other elements including selenium, arsenic, and iodine as a means of examining the importance of water column reduction versus advective interactions with reducing coastal sediments. As such, the elements selected as the focus of this study, will provide information on dust input and redox cycling, especially when compared with other elements being determined by other cruise participants.6:["$","$L19",null,{"dataset":{"_id":"647909","description":"

Dissolved molybdenum concentrations from samples taken at EPZT GEOTRACES stations using the Super-GeoFISH towed surface sampler and bottle samples from the GEOTRACES CTD carousel.

\n","problem":"","acquisition":"

Clean seawater samples were collected from two sources; a GEOTRACES CTD referred to as GT-C/12L GoFlo, and the Super-GeoFISH towed surface vehicle. For more information on these methods, see the cruise report (Supplemental File) and the GeoFish description (under Instruments).

\n","processing":"$1a","bcodmoProcessing":"","title":"Dissolved molybdenum data from GeoFISH and Bottle samples from R/V Thomas G. Thompson TN303 (GP16) in the Eastern Tropical Pacific (Transect from Peru to Tahiti) from November to December 2013","nickname":"GP16 Molybdenum dissolved","dataUrl":"","currentState":"Final no updates expected","currentStateId":"7","validated":true,"restricted":false,"version":"1","version_date":"2016-11-10T05:00:00.000Z","abstract":"Dissolved molybdenum data from GeoFISH and Bottle samples from R/V Thomas G. Thompson TN303 (GP16) in the Eastern Tropical Pacific (Transect from Peru to Tahiti) from November to December 2013.","citation":"Shiller, A. M. (2021) Dissolved molybdenum data from GeoFISH and Bottle samples from R/V Thomas G. Thompson TN303 (GP16) in the Eastern Tropical Pacific (Transect from Peru to Tahiti) from November to December 2013. Biological and Chemical Oceanography Data Management Office (BCO-DMO). 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Moffett","role":"Chief Scientist"},{"id":"50679","name":"Gregory A. Cutter","role":"Co-Chief Scientist"},{"id":"51700","name":"Christopher R. German","role":"Co-Chief Scientist"}]}],"funding":[{"_id":"647922","name":"OCE-1261214","fundingSource":{"_id":"355","name":"NSF Division of Ocean Sciences"},"url":"https://www.nsf.gov/awardsearch/show-award?AWD_ID=1261214"}],"instruments":[{"_id":"647955","name":"GEOTRACES CTD","description":"","type_id":"591","type_name":"CTD Sea-Bird SBE 911plus","type_desc":"The Sea-Bird SBE 911 plus is a type of CTD instrument package for continuous measurement of conductivity, temperature and pressure. The SBE 911 plus includes the SBE 9plus Underwater Unit and the SBE 11plus Deck Unit (for real-time readout using conductive wire) for deployment from a vessel. The combination of the SBE 9 plus and SBE 11 plus is called a SBE 911 plus. The SBE 9 plus uses Sea-Bird's standard modular temperature and conductivity sensors (SBE 3 plus and SBE 4). 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It was developed by Geoffrey Smith and Ken Bruland (University of California, Santa Cruz).","type_acronym":"GeoFish"},{"_id":"647954","name":"ICP-MS","description":"ThermoFisher Element 2 Inductively Coupled Plasma Mass Spectrometer (ICP-MS)","type_id":"530","type_name":"Inductively Coupled Plasma Mass Spectrometer","type_desc":"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.","type_acronym":"ICP Mass Spec"}],"parameters":[{"_id":"647936","name":"CRUISE_ID","format":"","frictionlessType":"","description":"

Cruise identifier. TN = R/V Thomas G. Thompson.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1102","name":"cruise_id","description":"

cruise designation; name

"}},{"_id":"647937","name":"SECT_ID","format":"","frictionlessType":"","description":"

GEOTRACES cruise name.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1929","name":"Cruise Name","description":"

The cruise_name is a local name chosen by project investigators for a research expedition on a vessel, as opposed to the formal/official cruise ID asserted by the vessel operator.

"}},{"_id":"647938","name":"STNNBR","format":"","frictionlessType":"","description":"

Station number. An underline used in this parameter indicates the sample is between two stations.

","units":{"_id":"","name":"unitless"},"type":{"_id":"987","name":"station","description":"

Station identifier; a unique number or alphanumeric string designating a general geographic location at which one or more sampling activities may occur.

"}},{"_id":"647939","name":"CASTNO","format":"","frictionlessType":"","description":"

Cast Number

","units":{"_id":"","name":"unitless"},"type":{"_id":"761","name":"cast","description":"

cast or profile number

"}},{"_id":"647940","name":"GEOTRC_SAMPNO","format":"","frictionlessType":"","description":"

GEOTRACES sample number.

","units":{"_id":"","name":"unitless"},"type":{"_id":"960","name":"sample","description":"

unique sample identification or number; any combination of alpha numeric characters; precise definition is file dependent

"}},{"_id":"647941","name":"EVENT_LAT","format":"","frictionlessType":"","description":"

Latitude at the start of the event; north is positive.

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"730","name":"latitude","description":"

latitude, in decimal degrees, North is positive, negative denotes South; Reported in some datasets as degrees, minutes

"}},{"_id":"647942","name":"EVENT_LON","format":"","frictionlessType":"","description":"

Longitude at the start of the event; east is positive.

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"731","name":"longitude","description":"

longitude, in decimal degrees, East is positive, negative denotes West; Reported in some datsets as degrees, minutes

"}},{"_id":"647943","name":"CTDDEPTH","format":"","frictionlessType":"","description":"

CTD bottle firing depth

","units":{"_id":"","name":"meters"},"type":{"_id":"808","name":"depth","description":"

Observation/sample depth below the sea surface. Units often reported as: meters, feet.

\nWhen used in a JGOFS/GLOBEC dataset the depth is a best estimate; usually but not always calculated from pressure; calculated either from CTD pressure using Fofonoff and Millard (1982; UNESCO Tech Paper #44) algorithm adjusted for 1980 equation of state for seawater (EOS80) or simply equivalent to nominal depth as recorded during sampling if CTD pressure was unavailable.

"}},{"_id":"647944","name":"MO_D_CONC_BOTTLE","format":"","frictionlessType":"","description":"

dissolved concentration of molybdenum from a bottle sample

","units":{"_id":"","name":"nanomoles per kilogram of seawater"},"type":{"_id":"1945","name":"trace_metal_conc","description":"

Concentration of a trace metal in seawater. Refer to dataset for element name and units.

"}},{"_id":"647945","name":"MO_D_CONC_BOTTLE_FLAG_W","format":"","frictionlessType":"","description":"

WOCE convention data flags: 2 = Good data; 3 = Questionable data, potentially correctable; 4 = Bad data; 5 = Probably good data, new phenomenon. Data flag 5 refers to samples with unusually low Mo concentrations, which have been confirmed but are subject to further investigation as to why they are low.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1144","name":"q_flag","description":"

quality flag; based on a PI established code; identifies a problem/quality issue with sample(s) from a given water bottle or single observation

"}},{"_id":"647946","name":"ISO_DATETIME_UTC_START_EVENT","format":"","frictionlessType":"","description":"

Date and time; formatted to the ISO 8601 standard; at the start of the sampling event; according to the event log. Format YYYY-MM-DDTHH:MM:SS[.xx]Z.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1908","name":"ISO_DateTime_UTC","description":"

Date/Time (UTC) ISO formatted
\nThis standard is based on ISO 8601:2004(E) and takes on any of the following forms:
\n2009-08-30T09:05:00[.xx] (local time)
\n2009-08-30T14:05:00[.xx]Z (UTC time)
\n2009-08-30T14:05:00[.xx]-05:00
\nThe dashes and the colons can be dropped.
\nThe T can also be dropped \"by mutual agreement\", but one needs the trailing Z if the time is UTC.

Sample ISO_datetime_utc:
\n2009-08-30T14:05:00[.xx]Z (UTC time)

Format: YYYY-mm-ddTHH:MM:SS[.xx]Z (UTC time)

"}},{"_id":"647956","name":"DEPTH_FISH","format":"","frictionlessType":"","description":"

depth of GeoFISH towed system

","units":{"_id":"","name":"meters"},"type":{"_id":"808","name":"depth","description":"

Observation/sample depth below the sea surface. Units often reported as: meters, feet.

"}},{"_id":"647957","name":"MO_D_CONC_FISH","format":"","frictionlessType":"","description":"

dissolved concentration of molybdenum from a GeoFISH

","units":{"_id":"","name":"nanomoles per kilogram of seawater"},"type":{"_id":"1945","name":"trace_metal_conc","description":"

Concentration of a trace metal in seawater. Refer to dataset for element name and units.

"}},{"_id":"647958","name":"MO_D_CONC_FISH_FLAG_W","format":"","frictionlessType":"","description":"

WOCE convention data flags: 2 = Good data; 3 = Questionable data; potentially correctable; 4 = Bad data; 5 = Probably good data; new phenomenon. Data flag 5 refers to samples with unusually low Mo concentrations; which have been confirmed but are subject to further investigation as to why they are low.

","units":{"_id":"","name":"unitless"},"type":{"_id":"1144","name":"q_flag","description":"

quality flag; based on a PI established code; identifies a problem/quality issue with sample(s) from a given water bottle or single observation

"}}],"related_publications":[],"related_datasets":[],"services":[{"grouping":"","items":[{"name":"View Data","description":"An in-browser view of the primary tabular data file","url":"https://www.bco-dmo.org/dataset/647909/data/view","contentType":"text/html","actionType":"view"}]},{"grouping":"Metadata","items":[{"name":"HTML","description":"A simple HTML page of the dataset metadata","url":"https://www.bco-dmo.org/dataset/647909/description","contentType":"text/html","actionType":"view"},{"name":"PDF","description":"A PDF of the HTML dataset metadata","url":"https://www.bco-dmo.org/dataset/647909/Dataset_description.pdf","contentType":"application/pdf","actionType":"download"},{"name":"ISO 19115-2 (NOAA Profile)","description":"","url":"https://www.bco-dmo.org/dataset/647909/iso","contentType":"application/xml","actionType":"download"}]}],"programs":[{"_id":"2022","name":"U.S. GEOTRACES","acronym":"U.S. GEOTRACES"}],"projects":[{"_id":"499723","name":"U.S. GEOTRACES East Pacific Zonal Transect (GP16)","acronym":"U.S. GEOTRACES EPZT","description":"$1b"},{"_id":"647923","name":"Geotraces Pacific Section: Gallium, vanadium, and associated elements indicative of dust input and redox cycling","acronym":"EPZT_Ga_V_others","description":"$1c"}],"archives":[{"id_value":"10.26008/1912/bco-dmo.647909.1","url":"https://doi.org/10.26008/1912/bco-dmo.647909.1","date_assigned":"2021-01-13","version_date":"2016-11-10","archiver":"Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)","archiver_id":"272"}],"license":{"name":"Creative Commons Attribution 4.0","id":"CC-BY-4.0","uri":"https://creativecommons.org/licenses/by/4.0/","spdxUri":"https://spdx.org/licenses/CC-BY-4.0"},"metrics":{"views":{"count":130},"downloads":{"count":926}}}}]