Dataset: 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)

ValidatedFinal no updates expectedVersion 2014-02-21 (2018-12-26)Dataset Type:Cruise Results

Principal Investigator: Daniel M. Sigman (Princeton University)

Co-Principal Investigator: Karen L. Casciotti (Stanford University)

Contact: Alexa Weigand (Princeton University)

BCO-DMO Data Manager: Nancy Copley (Woods Hole Oceanographic Institution)

Program: U.S. GEOTRACES (U.S. GEOTRACES)

Project: U.S. GEOTRACES North Atlantic Transect (GA03) (U.S. GEOTRACES NAT)

Cite Dataset

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.

Results are published in Marconi et al (2015).

DMO Note: 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.

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 GEOTRACES-NAT project page.

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Related Publications

Results
Marconi, D., Alexandra Weigand, M., Rafter, P. A., McIlvin, M. R., Forbes, M., Casciotti, K. L., & Sigman, D. M. (2015). Nitrate isotope distributions on the US GEOTRACES North Atlantic cross-basin section: Signals of polar nitrate sources and low latitude nitrogen cycling. Marine Chemistry, 177, 143–156. doi:10.1016/j.marchem.2015.06.007
Methods
Casciotti, K. L., Sigman, D. M., Hastings, M. G., Böhlke, J. K., & Hilkert, A. (2002). Measurement of the Oxygen Isotopic Composition of Nitrate in Seawater and Freshwater Using the Denitrifier Method. Analytical Chemistry, 74(19), 4905–4912. doi:10.1021/ac020113w
Methods
Granger, J., & Sigman, D. M. (2009). Removal of nitrite with sulfamic acid for nitrate N and O isotope analysis with the denitrifier method. Rapid Communications in Mass Spectrometry, 23(23), 3753–3762. doi:10.1002/rcm.4307
Methods
Sigman, D. M., Casciotti, K. L., Andreani, M., Barford, C., Galanter, M., & Böhlke, J. K. (2001). A Bacterial Method for the Nitrogen Isotopic Analysis of Nitrate in Seawater and Freshwater. Analytical Chemistry, 73(17), 4145–4153. doi:10.1021/ac010088e

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]

Terms of Use

This dataset is licensed under Creative Commons Attribution 4.0.


If you wish to use this dataset, it is highly recommended that you contact the original principal investigators (PI). Should the relevant PI be unavailable, please contact BCO-DMO (info@bco-dmo.org) for additional guidance. For general guidance please see the BCO-DMO Terms of Use document.

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Funded by the U.S. National Science Foundation