<div><p>Tritium samples were obtained by transfer from NISKIN bottles to cleaned and baked 1 liter flint glass bottles fitted with polyseal caps (Lott and Jenkins 1998). On shore, approximately 500 ml of the sample is transferred under an argon atmosphere to a pre-cleaned 1 liter aluminosilicate glass flask and degassed (quantitatively removing all dissolved helium) and stored for a minimum of 6 months in a cosmic-ray sheltered environment for 3-He regrowth (Clarke, Jenkins et al. 1976). The tritiugenic 3-He is harvested and analyzed with a mass spectrometer (Lott and Jenkins 1998). The overall uncertainty is estimated from a combination of measurement counting statistics, variation in cosmogenic production rates, and uncertainty in the running standard.</p>
<p><strong>References:</strong><br />
Clarke, W. B., W. J. Jenkins and Z. Top (1976). "Determination of tritium by spectrometric measurement of 3He." International Journal of Applied Radiation and Isotopes 27: 515-525.</p>
<p>Lott, D. E. and W. J. Jenkins (1998). "Advances in the analysis and shipboard processing of tritium and helium samples." International WOCE Newsletter 30: 27-30.</p></div>
Tritium Concentrations from GEOTRACES 2013 Eastern Pacific Zonal Transect
<div><p>Tritium Concentrations from GEOTRACES 2013 Eastern Pacific Zonal Transect cruise (TN303).</p></div>
GP16 Tritium
<div><p>Additional columns (pressure, temperature, salinity, latitude, longitude) provided in original data are included for reference only. All quality flags follow CCHDO/WOCE conventions.</p>
<p><strong>BCO-DMO Processing Note: </strong>modified parameter names to conform with BCO-DMO and GEOTRACES naming conventions.</p>
<p><strong>Additional GEOTRACES Processing:</strong><br />
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.</p>
<p>This added information will facilitate subsequent analysis and inter comparison of the datasets.</p>
<p>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.</p>
<p>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.</p>
<p>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.</p>
<p>See the dataset parameters documentation for a description of which parameters were supplied by the PI and which were added via the join method.</p></div>
664765
GP16 Tritium
2016-11-15T15:06:33-05:00
2016-11-15T15:06:33-05:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:664765
Tritium Concentrations from the 2013 Eastern Pacific Zonal Transect cruise on R/V Thomas G. Thompson (TN303) (US GEOTRACES EPZT project)
false
Jenkins, W. J. (2016) Tritium Concentrations from the 2013 Eastern Pacific Zonal Transect cruise on R/V Thomas G. Thompson (TN303) (US GEOTRACES EPZT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 15 Nov 2016) Version Date 2016-11-15 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/664765 [access date]
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15 Nov 2016
false
2016-11-15
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