1b: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"] 1c:T4af,

Sampling Description:
Tritium samples were transferred from Niskin bottles to cleaned 1 liter flint glass bottles (Lott and Jenkins, 1998).

Sample Processing:
Tritium water samples were transferred into specially prepared 1 liter aluminosilicate flasks and stored for at least 6 months for measurement of tritium by 3He regrowth.

Sample Analysis:
Tritium measurements were made by peak height manometry of an appropriately sized marine air standard (Lott and Jenkins, 1984) to an accuracy of better than 0.5% in quadrature with ion counting statistics limits. Uncertainties are therefore reported on a per-sample basis.

References:
Lott, D.E., Jenkins, W.J., 1984. An automated cryogenic charcoal trap system for helium isotope mass spectrometry. Review of Scientific Instruments 55, 1982-1988. doi: 10.1063/1.1137692
Lott, D.E., Jenkins, W.J., 1998. Advances in the analysis and shipboard processing of tritium and helium samples. International WOCE Newsletter 30, 27-30.

1d:Tc68,

The data are flagged using the WOCE protocol.

Parameter names were modified to conform with BCO-DMO naming conventions.

lat_nom and lon_nom were added by BCO-DMO from station waypoints provided by the Chief Scientist of cruise KN199-04.

History:
Version 20 Dec 2012: Initial data submitted to BCO-DMO.
Version 04 Jan 2013: There was a calibration error in the first submission (an approximately 2% offset), which was corrected in the 04 Jan 2013 version.
Version 10 Jan 2013: An additional correction to a single quality flag was made on 10 Jan 2013.
Version 26 Nov 2013: GT11 data was added.
Version 10 March 2016: Replaced dataset with revised version. Includes addtional columns (temp, sal) and includes corrections to erroneous values in previous version that were due to a software bug.

Additional GEOTRACES Processing: After the data were submitted to the International Data Management Office, BODC, the office noticed that important identifying information was missing in many datasets. With the agreement of BODC and the US GEOTRACES lead PIs, 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: station_GEOTRC, cast_GEOTRC (bottle and pump data only), event_GEOTRC, sample_GEOTRC, sample_bottle_GEOTRC (bottle data only), bottle_GEOTRC (bottle data only), depth_GEOTRC_CTD (bottle data only), depth_GEOTRC_CTD_rounded (bottle data only), BTL_ISO_DateTime_UTC (bottle data only), and GeoFish_id (GeoFish data only). 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_GT10, GT-C_Bottle_GT11, ODF_Bottle_GT10, and ODF_Bottle_GT11 datasets. Non-bottle parameters, including those from GeoFish tows, Aerosol sampling, and McLane Pumps, were taken from the Event_Log_GT10 and Event_Log_GT11 datasets. McLane pump cast numbers missing in event logs were taken from the Particulate Th-234 dataset submitted by Ken Buesseler.

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 name 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.

1e:T12bf,Much of this text appeared in an article published in OCB News, October 2008, by the OCB Project Office. The first U.S. GEOTRACES Atlantic Section will be specifically centered around a sampling cruise to be carried out in the North Atlantic in 2010. Ed Boyle (MIT) and Bill Jenkins (WHOI) organized a three-day planning workshop that was held September 22-24, 2008 at the Woods Hole Oceanographic Institution. The main goal of the workshop, sponsored by the National Science Foundation and the U.S. GEOTRACES Scientific Steering Committee, was to design the implementation plan for the first U.S. GEOTRACES Atlantic Section. The primary cruise design motivation was to improve knowledge of the sources, sinks and internal cycling of Trace Elements and their Isotopes (TEIs) by studying their distributions along a section in the North Atlantic (Figure 1). The North Atlantic has the full suite of processes that affect TEIs, including strong meridional advection, boundary scavenging and source effects, aeolian deposition, and the salty Mediterranean Outflow. The North Atlantic is particularly important as it lies at the "origin" of the global Meridional Overturning Circulation. It is well understood that many trace metals play important roles in biogeochemical processes and the carbon cycle, yet very little is known about their large-scale distributions and the regional scale processes that affect them. Recent advances in sampling and analytical techniques, along with advances in our understanding of their roles in enzymatic and catalytic processes in the open ocean provide a natural opportunity to make substantial advances in our understanding of these important elements. Moreover, we are motivated by the prospect of global change and the need to understand the present and future workings of the ocean's biogeochemistry. The GEOTRACES strategy is to measure a broad suite of TEIs to constrain the critical biogeochemical processes that influence their distributions. In addition to these "exotic" substances, more traditional properties, including macronutrients (at micromolar and nanomolar levels), CTD, bio-optical parameters, and carbon system characteristics will be measured. The cruise starts at Line W, a repeat hydrographic section southeast of Cape Cod, extends to Bermuda and subsequently through the North Atlantic oligotrophic subtropical gyre, then transects into the African coast in the northern limb of the coastal upwelling region. From there, the cruise goes northward into the Mediterranean outflow. The station locations shown on the map are for the "fulldepth TEI" stations, and constitute approximately half of the stations to be ultimately occupied. Figure 1. The proposed 2010 Atlantic GEOTRACES cruise track plotted on dissolved oxygen at 400 m depth. Data from the World Ocean Atlas (Levitus et al., 2005) were plotted using Ocean Data View (courtesy Reiner Schlitzer). [click on the image to view a larger version] Hydrography, CTD and nutrient measurements will be supported by the Ocean Data Facility (J. Swift) at Scripps Institution of Oceanography and funded through NSF Facilities. They will be providing an additional CTD rosette system along with nephelometer and LADCP. A trace metal clean Go-Flo Rosette and winch will be provided by the group at Old Dominion University (G. Cutter) along with a towed underway pumping system. The North Atlantic Transect cruise began in 2010 with KN199 leg 4 (station sampling) and leg 5 (underway sampling only) (Figure 2). KN199-04 Cruise Report (PDF) Figure 2. The red line shows the cruise track for the first leg of the US Geotraces North Atlantic Transect on the R/V Knorr in October 2010. The rest of the stations (beginning with 13) will be completed in October-December 2011 on the R/V Knorr (courtesy of Bill Jenkins, Chief Scientist, GNAT first leg). [click on the image to view a larger version] The section completion effort resumed again in November 2011 with KN204-01A,B (Figure 3). KN204-01A,B Cruise Report (PDF) Figure 3. Station locations occupied on the US Geotraces North Atlantic Transect on the R/V Knorr in November 2011. [click on the image to view a larger version] Data from the North Atlantic Transect cruises are available under the Datasets heading below, and consensus values for the SAFe and North Atlantic GEOTRACES Reference Seawater Samples are available from the GEOTRACES Program Office: Standards and Reference Materials ADCP data are available from the Currents ADCP group at the University of Hawaii at the links below: KN199-04 (leg 1 of 2010 cruise; Lisbon to Cape Verde) KN199-05 (leg 2 of 2010 cruise; Cape Verde to Charleston, NC) KN204-01A (part 1 of 2011 cruise; Woods Hole, MA to Bermuda) KN204-01B (part 2 of 2011 cruise; Bermuda to Cape Verde)6:["$","$L1b",null,{"dataset":{"_id":"3824","description":"

Status note: This dataset was revised on 10 March 2016. These data replace the previously submitted dataset, which contained erroneous values due to a software bug.

Concentration of Tritium from Niskin bottle samples from the KN199-04 (GT10) and KN204-01 (GT11) cruises. Station, cast, and Niskin bottle numbers are provided along with CTD pressure.

\nPlease note that some US GEOTRACES data may not be final, pending intercalibration results and further analysis. If you are interested in following changes to US GEOTRACES NAT data, there is an RSS feed available via the BCO-DMO US GEOTRACES project page (scroll down and expand the \"Datasets\" section).

\n","problem":"","acquisition":"$1c","processing":"$1d","bcodmoProcessing":"","title":"Tritium concentration from R/V Knorr cruises KN199-04 (GT10) and KN204-01 (GT11) in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)","nickname":"GT10-11 - Tritium","dataUrl":"","currentState":"Final no updates expected","currentStateId":"7","validated":true,"restricted":false,"version":"10 March 2016","version_date":"2016-03-10T05:00:00.000Z","abstract":"","citation":"Jenkins, W. J. (2016) Tritium concentration from R/V Knorr cruises KN199-04 (GT10) and KN204-01 (GT11) in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). 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The MS1 is a 10-inch radius, 90-degree magnetic sector instrument dedicated to the measurement of tritium, helium, and neon in seawater and groundwater samples. For a full description, see http://www.whoi.edu/sbl/liteSite.do?litesiteid=28952&articleId=47708","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":"5995","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"}],"parameters":[{"_id":"31438","name":"press","format":"","frictionlessType":"","description":"

Pressure from CTD.

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

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

"}},{"_id":"31439","name":"Tritium","format":"","frictionlessType":"","description":"

Concentration of Tritium.

","units":{"_id":"","name":"T.U. (tritium units)"},"type":{"_id":"1948","name":"radioactive_isotope_conc","description":"

Concentration of a radioactive isotope in seawater. Refer to dataset for isotope name and units.

"}},{"_id":"31440","name":"Tritium_err","format":"","frictionlessType":"","description":"

Tritium concentration error.

","units":{"_id":"","name":"T.U. (tritium units)"},"type":{"_id":"1949","name":"radioactive_isotope_err","description":"

Error reported for the concentration of a radioactive isotope in seawater. Refer to dataset for isotope and units.

"}},{"_id":"31441","name":"Tritium_flag","format":"","frictionlessType":"","description":"

Tritium concentration quality flag using the WOCE protocol.

","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":"32811","name":"lat_nom","format":"","frictionlessType":"","description":"

Nominal latitude of station. Obtained from KN199-04 station waypoints provided by Chief Sci.

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"1132","name":"lat_n","description":"

nominal latitude; negative denotes South

"}},{"_id":"32812","name":"lon_nom","format":"","frictionlessType":"","description":"

Nominal longitude of station. Obtained from KN199-04 station waypoints provided by Chief Sci.

","units":{"_id":"","name":"decimal degrees"},"type":{"_id":"1131","name":"lon_n","description":"

nominal longitude; negative denotes West

"}},{"_id":"33120","name":"cruise_id","format":"","frictionlessType":"","description":"

Official cruise identifier e.g. KN199-04 = R/V Knorr cruise number 199-04.

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

cruise designation; name

"}},{"_id":"33121","name":"station_GEOTRC","format":"","frictionlessType":"","description":"

GEOTRACES station number; ranges from 1 through 12 for KN199-04 and 1 through 24 for KN204-01. Stations 7 and 9 were skipped on KN204-01. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'station'; this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.

","units":{"_id":"","name":"dimensionless"},"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":"33122","name":"cast_GEOTRC","format":"","frictionlessType":"","description":"

Cast identifier numbered consecutively within a station. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'cast'; this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.

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

cast or profile number

"}},{"_id":"33123","name":"event_GEOTRC","format":"","frictionlessType":"","description":"

Unique identifying number for US GEOTRACES sampling events; ranges from 2001 to 2225 for KN199-04 events and from 3001 to 3282 for KN204-01 events. Values were added from the intermediate US GEOTRACES master file (see Processing Description).

","units":{"_id":"","name":"dimensionless"},"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":"33124","name":"sample_GEOTRC","format":"","frictionlessType":"","description":"

Unique identifying number for US GEOTRACES samples; ranges from 5033 to 6078 for KN199-04 and from 6112 to 8148 for KN204-01. Values were added from the intermediate US GEOTRACES master file (see Processing Description).

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

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

"}},{"_id":"33125","name":"sample_bottle_GEOTRC","format":"","frictionlessType":"","description":"

Unique identification numbers given to samples taken from bottles; rangies from 1 to 24; often used synonymously with bottle number. PI-supplied values were identical to those in the intermediate US GEOTRACES master file. Originally submitted as 'bottle'; this parameter name has been changed to conform to BCO-DMO's GEOTRACES naming conventions.

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

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

"}},{"_id":"33126","name":"bottle_GEOTRC","format":"","frictionlessType":"","description":"

Alphanumeric characters identifying bottle type (e.g. NIS representing Niskin and GF representing GOFLO) and position on a CTD rosette. Values were added from the intermediate US GEOTRACES master file (see Processing Description).

","units":{"_id":"","name":"dimensionless"},"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":"33127","name":"depth_GEOTRC_CTD","format":"","frictionlessType":"","description":"

Observation/sample depth in meters; calculated from CTD pressure. Values were added from the intermediate US GEOTRACES master file (see Processing Description).

","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":"33128","name":"BTL_ISO_DateTime_UTC","format":"","frictionlessType":"","description":"

Date and time (UTC) variable recorded at the bottle sampling time in ISO compliant format. Values were added from the intermediate US GEOTRACES master file (see Processing Description). This standard is based on ISO 8601:2004(E) and takes on the following form: 2009-08-30T14:05:00[.xx]Z (UTC time)

","units":{"_id":"","name":"YYYY-MM-DDTHH:MM:SS[.xx][+/-TZ]"},"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":"640095","name":"cruise_name","format":"","frictionlessType":"","description":"

Cruise name.

","units":{"_id":"","name":"dimensionless"},"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":"640098","name":"temp","format":"","frictionlessType":"","description":"

Water temperature, from CTD. (Originally called 'CTDTMP')

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

water temperature at measurement depth

"}},{"_id":"640099","name":"sal","format":"","frictionlessType":"","description":"

Salinity, from CTD. (Originally called 'CTDSAL')

","units":{"_id":"","name":"practical salinity units (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.

"}}],"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/3824/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/3824/description","contentType":"text/html","actionType":"view"},{"name":"PDF","description":"A PDF of the HTML dataset metadata","url":"https://www.bco-dmo.org/dataset/3824/Dataset_description.pdf","contentType":"application/pdf","actionType":"download"},{"name":"ISO 19115-2 (NOAA Profile)","description":"","url":"https://www.bco-dmo.org/dataset/3824/iso","contentType":"application/xml","actionType":"download"}]}],"programs":[{"_id":"2022","name":"U.S. GEOTRACES","acronym":"U.S. GEOTRACES"}],"projects":[{"_id":"2066","name":"U.S. GEOTRACES North Atlantic Transect (GA03)","acronym":"U.S. GEOTRACES NAT","description":"$1e"}],"archives":[],"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":151},"downloads":{"count":345}}},"fileId":"899744"}]