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: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.1b:T9b1,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. The National Science Foundation is supporting a U.S. GEOTRACES sampling expedition in the Pacific Ocean in 2018, that will conduct full ocean depth at sites extending south from Alaska to Tahiti. The purpose of this project is to measure the concentrations of chlorofluorocarbon (CFC) compounds and of sulfur hexafluoride (SF6) along this transect of stations. These gas measurements can be used to determine the "ages" of water parcels and the rates of important oceanographic and biogeochemical processes. Such information is essential to the interpretation of the trace element and isotope data that will be gathered as part of GEOTRACES. The trace gas concentrations, ventilation ages, and rate data will all be made available to other investigators within six months of collection, forming an important foundation for the GEOTRACES Pacific program. The project team will measure CFC-11, CFC-12, and SF6 concentrations aboard the 2018 Pacific Meridional Transect. Beyond the concentration measurements, the project has the following specific objectives: 1) Calculate tracer ages and identify the relative extent of ventilation and dilution of thermocline and intermediate water masses within which Trace Elements and their Isotopes (TEIs) reside across different circulation regimes, 2) Calculate rates of biochemically important processes (including apparent oxygen utilization and denitrification rates) and distinguish between the contributions from physical and biogeochemical processes across the different circulation regimes, 3) Put tracer and hydrographic GEOTRACES data into context of larger space and time scales using historical tracer, hydrographic, ARGO CTD and oxygen data. The CFC and SF6 tracer data will contribute to interpretation of the key GEOTRACES trace elements and isotopes by characterizing physical processes, which can affect trace element speciation and internal cycling. Calculated tracer ages are the backbone of this project and are the primary service for other GEOTRACES PIs. Tracer ages will be used to address each of the objectives. As tracer ages are an important part of the contribution to the GEOTRACES program, uncertainties will be estimated for the ages related to internal ocean variability and effects of mixing due to non-stationarity of the atmospheric transients.6:["$","$L19",null,{"dataset":{"_id":"820232","description":"

CFC-12, CFC-11, and SF6 concentrations from the US GEOTRACES Pacific Meridional Transect (PMT) cruises, RR1814 and RR1814 (GP15), on the R/V Roger Revelle from September to November 2018.

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

Samples were taken from Niskin bottles. They were unfiltered. Note there is no SF6 data for the first leg of the cruise (RR1814).

Procedures:
\nFill 300 ml and flush BOD bottles with water in a one liter overflow bottle. Cap bottle underwater. Analysis is on a custom-built purge and trap gas chromatography with electron capture detection. Data were processed using Labview and Excel.

\n","processing":"

BCO-DMO Processing:
\n- renamed parameters;
\n- added date/time field in ISO8601 format;
\n- replaced \"-99\" with \"nd\" (\"no data\");
\n- rounded CFC_12_D_CONC_BOTTLE and CFC_11_D_CONC_BOTTLE values to 4 decimal places.

\n","bcodmoProcessing":"","title":"CFC-12, CFC-11, and SF6 concentrations from the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15) from September to November 2018","nickname":"GP15 CFCs and SF6","dataUrl":"","currentState":"Final no updates expected","currentStateId":"7","validated":true,"restricted":false,"version":"1","version_date":"2020-08-13T04:00:00.000Z","abstract":"CFC-12, CFC-11, and SF6 concentrations from the US GEOTRACES Pacific Meridional Transect (PMT) cruises, RR1814 and RR1814 (GP15), on the R/V Roger Revelle from September to November 2018.","citation":"Fine, R. (2020) CFC-12, CFC-11, and SF6 concentrations from the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15) from September to November 2018. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2020-08-13 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.820232.1 [access date]","citationParts":{"identifier":"doi:10.26008/1912/bco-dmo.820232.1","versionDate":"2020-08-13","versionId":"1","year":"2020","title":"CFC-12, CFC-11, and SF6 concentrations from the US GEOTRACES Pacific Meridional Transect (PMT) cruise (GP15) from September to November 2018","authors":"Fine, R.","publisher":"Biological and Chemical Oceanography Data Management Office (BCO-DMO)."},"doi":"10.26008/1912/bco-dmo.820232.1","release_date":null,"field_dataset_location":"","temporal_extent":{"start":"2018-09-24T04:00:00.000Z","end":"2018-11-23T05:00:00.000Z"},"temporal":{"resolution":"time:unitDay","type":"time:Interval","start":{"value":"1537761600","label":"2018-09-24"},"end":{"value":"1542949200","label":"2018-11-23"}},"spatial_extent":{"shape":"polygon","center":{"latitude":18.02925,"longitude":-154.4745},"wkt":"POLYGON ((-156.9628 -20, -151.9862 -20, -151.9862 56.0585, -156.9628 56.0585, -156.9628 -20))","north":56.0585,"east":-151.9862,"south":-20,"west":-156.9628},"dataset_type":["Cruise Results"],"keywords":["oceans"],"data_files":[{"id":"903022","title":"CFC_SF6.csv","url":"https://datadocs.bco-dmo.org/dataset/820232/file/xooyA9zt93ZRpj/CFC_SF6.csv","showTableUrl":"https://www.bco-dmo.org/dataset/820232/data/view/903022","description":"Primary data file for dataset ID 820232","filename":"CFC_SF6.csv","bytesize":114872,"checksum":{"value":"0741ad7ee2c7120ea4c4db7efab9c1fc","Algorithm":{"_id":"190","name":"MD5"}},"mimetype":"text/csv","fileType":{"_id":"192","name":"Comma Separated Values (.csv)"},"isErddap":"","date":"","isPublicDuringEmbargo":false,"primaryDataFile":true,"showTable":true,"restricted":false}],"supplemental_files":[],"roles":[{"role":{"_id":"138","name":"Principal Investigator"},"performedBy":{"_id":"679313","name":"Rana A. Fine"},"performedAtOrganization":{"_id":"36","name":"University of Miami Rosenstiel School of Marine and Atmospheric Science"}},{"role":{"_id":"133","name":"Contact"},"performedBy":{"_id":"679316","name":"Jim Happell"},"performedAtOrganization":{"_id":"36","name":"University of Miami Rosenstiel School of Marine and Atmospheric Science"}},{"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"}]},{"_id":"776917","name":"RR1815","synonyms":["GP15","GP15 Leg 2","33RR20180918","PMT","US GEOTRACES PMT"],"dates":{"start":"2018-10-24T00:00:00.000Z","end":"2018-11-24T00:00:00.000Z"},"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":"779322","name":"OCE-1737041","fundingSource":{"_id":"355","name":"NSF Division of Ocean Sciences"},"url":"https://www.nsf.gov/awardsearch/show-award?AWD_ID=1737041"}],"instruments":[{"_id":"820343","name":"custom-built purge and trap gas chromatography with electron capture detection","description":"","type_id":"643458","type_name":"Automated Purge and Trap System","type_desc":"This equipment removes dissolved gases from the water samples, traps the extracted compounds on a cold trap and then heats the trap and injects the trapped gases into the gas chromatograph. It is automated and controlled by a laptop computer.","type_acronym":""},{"_id":"820344","name":"custom-built purge and trap gas chromatography with electron capture detection","description":"","type_id":"661","type_name":"Gas Chromatograph","type_desc":"Instrument separating gases, volatile substances, or substances dissolved in a volatile solvent by transporting an inert gas through a column packed with a sorbent to a detector for assay. (from SeaDataNet, BODC)","type_acronym":"Gas Chromatograph"},{"_id":"820361","name":"","description":"Samples were taken from Niskin bottles. They were unfiltered.","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"}],"parameters":[{"_id":"820370","name":"STNNBR","format":"","frictionlessType":"","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":"820371","name":"CASTNO","format":"","frictionlessType":"","description":"

Cast number

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

cast or profile number

"}},{"_id":"820372","name":"SAMPNO","format":"","frictionlessType":"","description":"

Sample bottle 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":"820373","name":"BTLNBR","format":"","frictionlessType":"","description":"

Bottle 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":"820374","name":"BTLNBR_FLAG_W","format":"","frictionlessType":"","description":"

Bottle quality flag; see WHP quality codes for the water bottle itself

","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":"820375","name":"GEOTRC_EVENTNO","format":"","frictionlessType":"","description":"

Event number

","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":"820376","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":"820377","name":"DATE","format":"","frictionlessType":"","description":"

Date; format: YYYYMMDD

","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":"820378","name":"TIME","format":"","frictionlessType":"","description":"

Time; format: hh:mm

","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":"820379","name":"ISO_DateTime_UTC","format":"","frictionlessType":"","description":"

Sampling date and time (UTC) formatted to ISO8601 standard: YYYY-MM-DDThh:mmZ

","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":"820380","name":"LATITUDE","format":"","frictionlessType":"","description":"

Latitude

","units":{"_id":"","name":"decimal 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":"820381","name":"LONGITUDE","format":"","frictionlessType":"","description":"

Longitude

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

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

"}},{"_id":"820382","name":"DEPTH","format":"","frictionlessType":"","description":"

Bottom depth

","units":{"_id":"","name":"meters (m)"},"type":{"_id":"818","name":"depth_w","description":"

water depth, in meters

"}},{"_id":"820383","name":"CTDPRS","format":"","frictionlessType":"","description":"

Sample/sensor pressure from CTD

","units":{"_id":"","name":"decibars"},"type":{"_id":"732","name":"pressure","description":"

water pressure at measurement; depth reported as pressure; positive number increasing with water depth

"}},{"_id":"820384","name":"CTDTMP","format":"","frictionlessType":"","description":"

Temperature from CTD sensor in the ITS-90 convention

","units":{"_id":"","name":"degrees Celsius"},"type":{"_id":"733","name":"temperature","description":"

water temperature at measurement depth

"}},{"_id":"820385","name":"CTDSAL","format":"","frictionlessType":"","description":"

Practical salinity from CTD sensor on the PSS-1978 scale

","units":{"_id":"","name":"psu"},"type":{"_id":"955","name":"sal","description":"

Salinity: The amount (mass or quantity of matter) of salt per amount (volume or mass) of a body of water.

"}},{"_id":"820386","name":"SF6_D_CONC_BOTTLE","format":"","frictionlessType":"","description":"

SF6 concentration

","units":{"_id":"","name":"femtomole/kg (fmol/kg)"},"type":{"_id":"820362","name":"sulfur hexafluoride","description":"

Sulfur hexafluoride (SF6)

"}},{"_id":"820387","name":"SF6_D_CONC_BOTTLE_FLAGW","format":"","frictionlessType":"","description":"

WOCE data quality flag for SF6_D_CONC_BOTTLE

","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":"820388","name":"CFC_12_D_CONC_BOTTLE","format":"","frictionlessType":"","description":"

CFC-12 concentration

","units":{"_id":"","name":"picomole/kg (pmol/kg)"},"type":{"_id":"820365","name":"dichlorodifluoromethane","description":"

dichlorodifluoromethane (CFC-12)

"}},{"_id":"820389","name":"CFC_12_D_CONC_BOTTLE_FLAGW","format":"","frictionlessType":"","description":"

WOCE data quality flag for CFC_12_D_CONC_BOTTLE

","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":"820390","name":"CFC_11_D_CONC_BOTTLE","format":"","frictionlessType":"","description":"

CFC-11 concentration

","units":{"_id":"","name":"picomole/kg (pmol/kg)"},"type":{"_id":"820367","name":"trichlorofluoromethane","description":"

trichlorofluoromethane (CFC-11)

"}},{"_id":"820391","name":"CFC_11_D_CONC_BOTTLE_FLAGW","format":"","frictionlessType":"","description":"

WOCE data quality flag for CFC_11_D_CONC_BOTTLE

","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/820232/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/820232/description","contentType":"text/html","actionType":"view"},{"name":"PDF","description":"A PDF of the HTML dataset metadata","url":"https://www.bco-dmo.org/dataset/820232/Dataset_description.pdf","contentType":"application/pdf","actionType":"download"},{"name":"ISO 19115-2 (NOAA Profile)","description":"","url":"https://www.bco-dmo.org/dataset/820232/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":"$1a"},{"_id":"779323","name":"GEOTRACES Pacific Meridional Transect: Measurement of chlorofluorocarbons and sulfur hexafluoride","acronym":"PMT CFC SF6","description":"$1b"}],"archives":[{"id_value":"10.26008/1912/bco-dmo.820232.1","url":"https://doi.org/10.26008/1912/bco-dmo.820232.1","date_assigned":"2020-08-13","version_date":"2020-08-13","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":262},"downloads":{"count":293}}}}]