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Methodology:Quantitative vacuum extraction and mass spectrometry.

Sampling and Analytical Procedures:
Water samples were transferred from Niskin bottles and stored in crimped copper tubing. Gases were extracted from the water samples in a shore-based vacuum system (see references for description) and stored in aluminosilicate glass ampoules. The extracted gases were chemically purified and cryogenically separated, then analyzed for argon, krypton, and xenon concentrations using ion counting in a triple filter quadrupole mass spectrometer. Argon was measured using ion current manometry corrected for small linearity effects. Krypton and xenon were determined using ratiometric isotope dilution. All measurements were standardized to air abundances. Details are given in Jenkins et al (2019) and Stanley et al (2007).

Samples were acquired at sea in replicate. During the generation of this dataset 53 pairs of replicates were analyzed to assess reproducibility. The results are summarized in the attached Supplemental File named "GP15_ArKrXe_Replicates.csv" (note the results listed in this Supplemental File are reported as molar quantities).

Dissolved helium, neon, and helium isotopes were also measured on the same samples and are available at BCO-DMO (see "Related Datasets").

1d:T724,

Data Processing:
Raw data were acquired and reduced using custom software written in VB.NET. Data were processed using MATLAB (2020b) and stored in a PostgreSQL V9.3 database.

Quality Flags:
Quality flags follow the ODF (WOCE) scheme. Defined as:
1 = Sample for this measurement was drawn from water bottle but analysis not received.
2 = Acceptable measurement.
3 = Questionable measurement.
4 = Bad measurement.
5 = Not reported.
6 = Mean of replicate measurements
7 = Manual chromatographic peak measurement.
8 = Irregular digital chromatographic peak integration.
9 = Sample not drawn for this measurement from this bottle.

BCO-DMO Processing:
Version 1 (date 2022-08-10)
- renamed fields to comply with BCO-DMO naming conventions;
- removed unnecessary He columns, which have already been contributed in separate datasets.

Version 2 (date 2025-04-09)
- Imported original file "ArKrXe Template Leg 1.xlsx" into the BCO-DMO system.
- Removed the unnecessary He columns, which have already been contributed in separate datasets.
- Renamed fields to comply with BCO-DMO naming conventions.
- Renamed the "Event_ID" and "Sample_ID" columns, which were incorrectly labeled.
- Removed rows for Station 19, which took place on RR1815 leg of cruise.
- Changed Station number "183" to "18.3".
- Joined the data to the RR1814 bottle file using {Station_ID}{Cast_number}{SAMPNO}; added the following fields from the bottle file: GEOTRC_EVENTNO, GEOTRC_SAMPNO, DATE, TIME.
- Compared GEOTRACES sample numbers from both files to verify they agree.
- Saved final file as "877873_v2_gp15_arkrxe_leg1.csv".

1e:Tda5,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.1f:Te56,NSF Award Abstract: The goal of the international GEOTRACES program is to understand the distributions of trace chemical elements and their isotopes in the oceans. An essential part of this effort is determining the sources of trace elements to the oceans. One important such source comes from seafloor hydrothermal venting. This project will support the measurement of helium isotopes on the 2018 U.S. GEOTRACES expedition in the Pacific Ocean, running south from Alaska to Tahiti. Helium isotopes provide important information on the presence and dispersion of hydrothermal plumes. On a larger scale, they can also be used to calculate global-scale inputs of hydrothermally-sourced trace elements and isotopes. Thus, the proposed work is closely tied to many other projects associated with this expedition. The measurement of helium isotopes will also allow enable the investigation of physical mixing rates within the upper ocean to help interpret the fate of other trace elements. At the northern end of the section, this approach will also be used to investigate the rate at which other trace elements and isotopes from seafloor hydrothermal venting are delivered to the more biologically productive surface ocean. In addition to supporting the GEOTRACES effort and participating in community-scale outreach efforts associated with the expedition, the investigators will also work with a visual artist to communicate their science to the public in new ways. The U.S. GEOTRACES Pacific Meridional Transect (56°N to 20°S, along 152°W) in late 2018 will intercept: strong margin fluxes, sub-Arctic high-nutrient, low-chlorophyll waters, the oldest deep waters in the world's oceans, the distal ends of multiple hydrothermal plumes, oxygen minimum zones, subpolar and equatorial upwelling, and, in the South Pacific near 20°S, some of the most oligotrophic waters known. This section, together with the US GEOTRACES East Pacific Zonal Transect (EPZT) conducted in 2013, will also close off a large volume of the Pacific Ocean. Consequently, this work will facilitate new, improved evaluations of regional-scale fluxes of hydrothermally-sourced trace elements and isotopes (TEIs) to the oceans. Because the 2018 expedition will intercept multiple hydrothermal plumes, this project will also allow the investigation of three key questions emerging from the larger U.S. and international GEOTRACES programs: 1) Is there a significant source of hydrothermally-sourced Fe and other TEIs to the euphotic zone in the North Pacific, through upwelling, as was demonstrated for the Southern Ocean from the 2013 EPZT results? 2) How do TEI:He-3 ratios in hydrothermal plumes vary with different geologic settings of their vent-sources? 3) How do the TEI:He-3 ratios imparted to hydrothermal plumes vary along the thermohaline conveyor as a function of varying water column chemistry? Throughout the section the investigators will also combine upper-water column helium-3 measurements with water column tritium concentrations (extrapolated from data collected on past expeditions) to estimate water column ventilation time scales that can be used to quantify rates of TEI transformation across the wide range of biogeochemical regimes to be intercepted (tropical, subtropical, subpolar). In regions characterized by upwelling, precise measurements of helium isotopes can be combined with canonical gas-exchange rate estimates to make flux-gauge determinations of upwelling rates for some key TEIs. This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.6:["$","$L1b",null,{"dataset":{"_id":"877873","description":"","problem":"","acquisition":"$1c","processing":"$1d","bcodmoProcessing":"","title":"Concentrations of dissolved argon, krypton, and xenon from Niskin bottle samples collected on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from Sept-Oct 2018","nickname":"GP15 Heavy Noble Gas Concentrations Leg 1","dataUrl":"","currentState":"Final no updates expected","currentStateId":"7","validated":true,"restricted":false,"version":"2","version_date":"2025-04-09T04:00:00.000Z","abstract":"This dataset includes concentrations of dissolved argon (Ar), krypton (Kr), and xenon (Xe) from Niskin bottle samples on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from September to October 2018.","citation":"Jenkins, W. J., German, C. R. (2025) Concentrations of dissolved argon, krypton, and xenon from Niskin bottle samples collected on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from Sept-Oct 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2) Version Date 2025-04-09 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.877873.2 [access date]","citationParts":{"identifier":"doi:10.26008/1912/bco-dmo.877873.2","versionDate":"2025-04-09","versionId":"2","year":"2025","title":"Concentrations of dissolved argon, krypton, and xenon from Niskin bottle samples collected on Leg 1 (Seattle, WA to Hilo, HI) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1814) on R/V Roger Revelle from Sept-Oct 2018","authors":"Jenkins, W. J., German, C. 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During the generation of this dataset 53 pairs of replicates were analyzed to assess reproducibility. The results are summarized in this Supplemental file. Version 2 contains a correction: at station 5, cast 5, sample bottle 36, the GTNum has been changed from 14551 to 14539. 14539 is the correct number for that station-cast-bottle per the GP15 bottle file and cast sheets.","filename":"gp15_arkrxe_replicates_v2.csv","bytesize":12582,"checksum":{"value":"1c1d952da4943d3e4d1b754cfaa99266","Algorithm":{"_id":"190","name":"MD5"}},"mimetype":"text/csv","fileType":{"_id":"192","name":"Comma Separated Values (.csv)"},"isErddap":"","date":"","isPublicDuringEmbargo":false,"primaryDataFile":false,"showTable":false,"restricted":false}],"roles":[{"role":{"_id":"138","name":"Principal Investigator"},"performedBy":{"_id":"50745","name":"William J. Jenkins"},"performedAtOrganization":{"_id":"2","name":"Woods Hole Oceanographic Institution"}},{"role":{"_id":"140","name":"Co-Principal Investigator"},"performedBy":{"_id":"51700","name":"Christopher R. German"},"performedAtOrganization":{"_id":"2","name":"Woods Hole Oceanographic Institution"}},{"role":{"_id":"145","name":"BCO-DMO Data Manager"},"performedBy":{"_id":"51498","name":"Shannon Rauch"},"performedAtOrganization":{"_id":"191","name":"Woods Hole Oceanographic Institution"}}],"deployments":[{"_id":"776913","name":"RR1814","synonyms":["GP15","GP15 Leg1","33RR20180918","PMT","US GEOTRACES PMT"],"dates":{"start":"2018-09-18T00:00:00.000Z","end":"2018-10-21T00:00:00.000Z"},"platform":{"_id":"54013","name":"R/V Roger Revelle"},"chiefScientists":[{"id":"50679","name":"Gregory A. Cutter","role":"Chief Scientist"},{"id":"50980","name":"Karen L. Casciotti","role":"Co-Chief Scientist"},{"id":"51146","name":"Phoebe J. Lam","role":"Co-Chief Scientist"}]}],"funding":[{"_id":"862186","name":"OCE-1756138","fundingSource":{"_id":"355","name":"NSF Division of Ocean Sciences"},"url":"https://www.nsf.gov/awardsearch/show-award?AWD_ID=1756138"}],"instruments":[{"_id":"877891","name":"","description":"The helium isotope mass spectrometer is a custom-built unit manufactured at the Woods Hole Oceanographic Institution.","type_id":"685","type_name":"Mass Spectrometer","type_desc":"General term for instruments used to measure the mass-to-charge ratio of ions; generally used to find the composition of a sample by generating a mass spectrum representing the masses of sample components.","type_acronym":"Mass Spec"},{"_id":"877892","name":"Niskin bottle","description":"","type_id":"413","type_name":"Niskin bottle","type_desc":"A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc.","type_acronym":"Niskin bottle"},{"_id":"877890","name":"HIDEN P/N PCI 1000 1.2HAL/3F 1301-9 PIC type 570,309","description":"","type_id":"842793","type_name":"Quadrupole Mass Spectrometer","type_desc":"A piece of apparatus that consists of an ion source, a mass-to-charge analyser, a detector and a vacuum system and is used to measure mass spectra. The detector is a quadrupole mass-to-charge analyser, which holds the ions in a stable orbit by an electric field generated by four parallel electrodes.\r\n\r\n ","type_acronym":"QMS"}],"parameters":[{"_id":"958493","name":"Station_ID","format":"","frictionlessType":"number","description":"

Station number

","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":"958494","name":"DATE","format":"%Y%m%d","frictionlessType":"date","description":"

Sample date; BCO-DMO added from GP15 bottle file

","units":{"_id":"","name":"unitless"},"type":{"_id":"1070","name":"date","description":"

date; generally reported in GMT as YYYYMMDD (year; month; day); also as MMDD (month; day); EqPac dates are local Hawaii time. ISO_Date format is YYYY-MM-DD (http://www.iso.org/iso/home/standards/iso8601.htm)

"}},{"_id":"958495","name":"TIME","format":"%H%M","frictionlessType":"time","description":"

Sample time; BCO-DMO added from GP15 bottle file

","units":{"_id":"","name":"unitless"},"type":{"_id":"1075","name":"time","description":"

Time GMT defined as HHMM; time of day; generally reported in GMT as HHMM (hours and minutes) but may also be HH.H (decimal hours) or HHMMSS (hours; minutes and seconds); in EqPac time is reported as Hawaii local time

"}},{"_id":"958496","name":"Start_Latitude","format":"","frictionlessType":"number","description":"

Latitude at start of sample collection

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

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

"}},{"_id":"958497","name":"Start_Longitude","format":"","frictionlessType":"number","description":"

Longitude at start of sample collection

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

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

"}},{"_id":"958498","name":"Cast_number","format":"","frictionlessType":"integer","description":"

Cast number

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

cast or profile number

"}},{"_id":"958499","name":"SAMPNO","format":"","frictionlessType":"integer","description":"

Bottle sample number

","units":{"_id":"","name":"unitless"},"type":{"_id":"757","name":"bottle","description":"

water bottle number, generally assigned to a position on a CTD rosette, identifies all samples drawn from a given bottle

"}},{"_id":"958500","name":"GEOTRC_EVENTNO","format":"","frictionlessType":"integer","description":"

Event number; BCO-DMO added from GP15 bottle file

","units":{"_id":"","name":"unitless"},"type":{"_id":"829","name":"event","description":"

Event or operation identifier; event or operation number; often derived from date/time (MMDDHHmm) of sampling and when combined with year (YYYY) is a unique sampling identifier/data processing key. Date/time is not necessarily in GMT.

"}},{"_id":"958501","name":"GEOTRC_SAMPNO","format":"","frictionlessType":"integer","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":"958502","name":"Sample_Depth","format":"","frictionlessType":"number","description":"

Sample depth

","units":{"_id":"","name":"meters (m)"},"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":"958503","name":"Kr_D_CONC_BOTTLE_bvbdxg","format":"","frictionlessType":"number","description":"

Dissolved krypton

","units":{"_id":"","name":"nanomoles per kilogram (nmol/kg)"},"type":{"_id":"1950","name":"diss_noble_gas_conc","description":"

Dissolved noble gas concentration in the water column. Refer to dataset for element name and units.

"}},{"_id":"958504","name":"SD1_Kr_D_CONC_BOTTLE_bvbdxg","format":"","frictionlessType":"number","description":"

One standard deviation of Kr_D_CONC_BOTTLE_bvbdxg

","units":{"_id":"","name":"nanomoles per kilogram (nmol/kg)"},"type":{"_id":"1950","name":"diss_noble_gas_conc","description":"

Dissolved noble gas concentration in the water column. Refer to dataset for element name and units.

"}},{"_id":"958505","name":"Flag_Kr_D_CONC_BOTTLE_bvbdxg","format":"","frictionlessType":"integer","description":"

Quality flag for Kr_D_CONC_BOTTLE_bvbdxg

","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":"958506","name":"Ar_D_CONC_BOTTLE_qphaf3","format":"","frictionlessType":"number","description":"

Dissolved argon

","units":{"_id":"","name":"micromoles per kilogram (umol/kg)"},"type":{"_id":"1950","name":"diss_noble_gas_conc","description":"

Dissolved noble gas concentration in the water column. Refer to dataset for element name and units.

"}},{"_id":"958507","name":"SD1_Ar_D_CONC_BOTTLE_qphaf3","format":"","frictionlessType":"number","description":"

One standard deviation of Ar_D_CONC_BOTTLE_qphaf3

","units":{"_id":"","name":"micromoles per kilogram (umol/kg)"},"type":{"_id":"1950","name":"diss_noble_gas_conc","description":"

Dissolved noble gas concentration in the water column. Refer to dataset for element name and units.

"}},{"_id":"958508","name":"Flag_Ar_D_CONC_BOTTLE_qphaf3","format":"","frictionlessType":"integer","description":"

Quality flag for Ar_D_CONC_BOTTLE_qphaf3

","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":"958509","name":"Xe_D_CONC_BOTTLE_2idk2h","format":"","frictionlessType":"number","description":"

Dissolved xenon

","units":{"_id":"","name":"nanomoles per kilogram (nmol/kg)"},"type":{"_id":"1950","name":"diss_noble_gas_conc","description":"

Dissolved noble gas concentration in the water column. Refer to dataset for element name and units.

"}},{"_id":"958510","name":"SD1_Xe_D_CONC_BOTTLE_2idk2h","format":"","frictionlessType":"number","description":"

One standard deviation of Xe_D_CONC_BOTTLE_2idk2h

","units":{"_id":"","name":"nanomoles per kilogram (nmol/kg)"},"type":{"_id":"1950","name":"diss_noble_gas_conc","description":"

Dissolved noble gas concentration in the water column. Refer to dataset for element name and units.

"}},{"_id":"958511","name":"Flag_Xe_D_CONC_BOTTLE_2idk2h","format":"","frictionlessType":"integer","description":"

Quality flag for Xe_D_CONC_BOTTLE_2idk2h

","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":[{"id":"862203","citation":"Jenkins, W. J., Lott, D. E., & Cahill, K. L. (2019). A determination of atmospheric helium, neon, argon, krypton, and xenon solubility concentrations in water and seawater. Marine Chemistry, 211(1), 94–107. doi:10.1016/j.marchem.2019.03.007\r\n","relation_type":["Methods"],"relation_desc":""},{"id":"744520","citation":"Stanley, R. H. R., Baschek, B., Lott, D. E., & Jenkins, W. J. (2009). A new automated method for measuring noble gases and their isotopic ratios in water samples. Geochemistry, Geophysics, Geosystems, 10(5), n/a–n/a. doi:10.1029/2009GC002429\r\n","relation_type":["Methods"],"relation_desc":""}],"related_datasets":[{"_id":"877899","name":"GP15 Heavy Noble Gas Concentrations Leg 2","url":"","relation_type":"IsContinuedBy","type_desc":"

Indicates datasets that are a continuation of this dataset, such as time series, repeat sampling locations, or two sections of one cruise.

\n","relation_desc":"GP15 was made up of two cruise legs, RR1814 (Leg 1) and RR1815 (Leg 2).","citation":"Jenkins, W. J., German, C. R. (2025) Concentrations of dissolved argon, krypton, and xenon from Niskin bottle samples collected on Leg 2 (Hilo, HI to Papeete, French Polynesia) of the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15, RR1815) on R/V Roger Revelle from Oct-Nov 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2) Version Date 2025-04-09 doi:10.26008/1912/bco-dmo.877899.2"},{"_id":"862182","name":"GP15 He Isotope C(He) and C(Ne) - Leg 1","url":"","relation_type":"IsRelatedTo","type_desc":"

The dataset is related to another dataset.

\n","relation_desc":"Both datasets were generated from the same samples.","citation":"Jenkins, W. J., German, C. R. (2021) Helium isotope with helium and neon concentration data 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. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2021-09-30 doi:10.26008/1912/bco-dmo.862182.1"}],"services":[{"grouping":"","items":[{"name":"View Data","description":"An in-browser view of the primary tabular data file","url":"https://www.bco-dmo.org/dataset/877873/data/view","contentType":"text/html","actionType":"view"}]},{"grouping":"ERDDAP","items":[{"name":"SUBSET DATA","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_877873_v2.html","contentType":"text/html","actionType":"tool"},{"name":"VIEW TABLE","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_877873_v2.htmlTable","contentType":"text/html","actionType":"view"},{"name":"CSV","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_877873_v2.csv","contentType":"text/csv","actionType":"download"},{"name":"TSV","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_877873_v2.tsv","contentType":"text/tsv","actionType":"download"},{"name":"GeoJSON","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_877873_v2.geoJson","contentType":"application/geo+json","actionType":"download"},{"name":"MATLAB","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_877873_v2.mat","contentType":"text/x-matlab","actionType":"download"},{"name":"netCDF","description":"","url":"https://erddap.bco-dmo.org/erddap/tabledap/bcodmo_dataset_877873_v2.nc","contentType":"application/x-netcdf","actionType":"download"}]},{"grouping":"Metadata","items":[{"name":"HTML","description":"A simple HTML page of the dataset metadata","url":"https://www.bco-dmo.org/dataset/877873/description","contentType":"text/html","actionType":"view"},{"name":"PDF","description":"A PDF of the HTML dataset metadata","url":"https://www.bco-dmo.org/dataset/877873/Dataset_description.pdf","contentType":"application/pdf","actionType":"download"},{"name":"ISO 19115-2 (NOAA Profile)","description":"","url":"https://www.bco-dmo.org/dataset/877873/iso","contentType":"application/xml","actionType":"download"}]}],"programs":[{"_id":"2022","name":"U.S. GEOTRACES","acronym":"U.S. GEOTRACES"}],"projects":[{"_id":"695926","name":"US GEOTRACES Pacific Meridional Transect (GP15)","acronym":"U.S. GEOTRACES PMT","description":"$1e"},{"_id":"862187","name":"Measurement of Helium Isotopes on the U.S. GEOTRACES Alaska-Tahiti Section (GP15)","acronym":"PMT Helium Isotopes","description":"$1f"}],"archives":[{"id_value":"10.26008/1912/bco-dmo.877873.2","url":"https://doi.org/10.26008/1912/bco-dmo.877873.2","date_assigned":"2025-06-02","version_date":"2025-04-09","archiver":"Marine Biological Laboratory/Woods Hole Oceanographic Institution Library (MBLWHOI DLA)","archiver_id":"272"},{"id_value":"10.26008/1912/bco-dmo.877873.1","url":"https://doi.org/10.26008/1912/bco-dmo.877873.1","date_assigned":"2022-08-10","version_date":"2022-08-10","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":127},"downloads":{"count":517}}},"fileId":"963436"}]