<div><p><strong>Sampling and Analytical Methodology: </strong>Seawater samples were processed in accordance with the published Denitrifier Method (citation provided below under Related Files and References). All isotopes analyses were performed on a MAT253 Thermo IRMS equipped with a custom-sample preparation system. With this system, we were able to achieve an overall standard deviation of 0.04 per mil for d15N-NO3 analyses and 0.09 per mil for d18O-NO3 analyses.</p></div>
Nitrogen and Oxygen isotope ratios of dissolved nitrate
<div><p>Isotope Analysis conducted using the Denitrifier Method on all samples received with nitrate concentrations greater than 0.30 uM nitrate. Nitrite removal performed where noted in the comments section.</p>
<p>Results are published in Marconi et al (2015).</p>
<p><strong>DMO Note:</strong> Fully unrestricted data, including the dNO3 columns served on 2018-12-26. Previous version of revised data was served on 12 March 2014. Original data were served in March 2013.</p>
<p>Please note that data may not be final, pending intercalibration results and further analysis. If you are interested in following changes to US GEOTRACES data, there is an RSS feed available from the <a href="http://www.bco-dmo.org/project/2066" target="_blank">GEOTRACES-NAT</a> project page.</p></div>
GT10-11 - Nitrate isotopes
<div><p><strong>Data Processing: </strong>Individual data points have been averaged with standard deviations reported. Please see papers cited under Related Files and References for equations applied to derive final data.</p>
<p><strong>BCO-DMO Processing Notes:</strong><br />
- Modified parameter names to conform with BCO-DMO naming conventions.<br />
- Replaced blanks with 'nd'.<br />
- Added 'cruise_id' based on the 'cruise_name' provided.<br />
- Moved 2010 above 2011 rows, sorted station and depth low-to-high<br />
- removed 'GT-' from the sample number so it would match the master file</p>
<p>Additional GEOTRACES Processing:<br />
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.</p>
<p>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.</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>
3933
GT10-11 - Nitrate isotopes
2013-04-30T16:35:23-04:00
2013-04-30T16:35:23-04:00
2023-07-07T16:10:26-04:00
urn:bcodmo:dataset:3933
Nitrogen and Oxygen isotope ratios of dissolved nitrate from R/V Knorr KN199-04, KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project)
false
Sigman, D. M., Casciotti, K. L. (2018) Nitrogen and Oxygen isotope ratios of dissolved nitrate from R/V Knorr KN199-04, KN204-01 in the Subtropical northern Atlantic Ocean from 2010-2011 (U.S. GEOTRACES NAT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 2014-02-21) Version Date 2018-12-26 [if applicable, indicate subset used]. http://lod.bco-dmo.org/id/dataset/3933 [access date]
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2014-02-21
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2018-12-26
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