Dataset: Nitrite (NO2-) isotopes and concentrations from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific from October to December 2013

Final no updates expectedDOI: 10.26008/1912/bco-dmo.933707.1Version 1 (2024-07-30)Dataset Type:Cruise Results

Principal Investigator: Karen L. Casciotti (Stanford University)

Student: Noah Gluschankoff (Stanford University)

BCO-DMO Data Manager: Shannon Rauch (Woods Hole Oceanographic Institution)


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

Project: U.S. GEOTRACES East Pacific Zonal Transect (GP16) (U.S. GEOTRACES EPZT)

Project: GEOTRACES Peru-Tahiti Nitrogen Isotope Measurements (EPZT Nitrogen Isotopes)


Abstract

This dataset includes nitrite (NO2-) isotopes and concentration measurements with accompanying physiochemical data from the 2013 U.S. GEOTRACES East Pacific Zonal Transect cruise (GP16). The cruise sailed from October 25, 2013 to December 18, 2023 aboard the R/V Thompson.

Seawater samples were collected at sea from Niskin bottles and were immediately analyzed for nitrite concentration. If sufficient nitrite concentrations (>0.1 micromoles per liter (umol/L)) were observed, samples were preserved as nitrous oxide (N2O) using sodium azide and acetic acid to selectively convert nitrite to nitrous oxide (McIlvin and Altabet, 2005). In the laboratory, the resultant N2O was analyzed using a custom purge and trap gas bench connected to an isotope ratio mass spectrometer. Nitrite isotope standards RSIL-N23, -N7373, and -N10219 were analyzed alongside the seawater samples to normalize nitrite d15N and d18O values to reference scales (Casciotti et al. 2007).


Related Datasets

IsRelatedTo

Dataset: GP16 N2O Isotopes and Concentrations
Casciotti, K. L., Gluschankoff, N. (2024) Nitrous oxide (N2O) isotopes and concentrations from the U.S. GEOTRACES EPZT cruise (GP16, TN303) on R/V Thomas G. Thompson in the tropical Pacific from October to December 2013. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2024-07-24 doi:10.26008/1912/bco-dmo.933645.1
IsRelatedTo

Dataset: GP16 d15N NO3
Casciotti, K., Altabet, M. (2020) Nitrate isotope data from R/V Thomas G. Thompson cruise TN303 in the Eastern Tropical Pacific in 2013 (U.S. GEOTRACES EPZT project). Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2016-06-24 doi:10.26008/1912/bco-dmo.650087.1

Related Publications

Methods

Casciotti, K. L., & McIlvin, M. R. (2007). Isotopic analyses of nitrate and nitrite from reference mixtures and application to Eastern Tropical North Pacific waters. Marine Chemistry, 107(2), 184–201. doi:10.1016/j.marchem.2007.06.021
Methods

McIlvin, M. R., & Altabet, M. A. (2005). Chemical Conversion of Nitrate and Nitrite to Nitrous Oxide for Nitrogen and Oxygen Isotopic Analysis in Freshwater and Seawater. Analytical Chemistry, 77(17), 5589–5595. doi:10.1021/ac050528s
Methods

McIlvin, M. R., & Casciotti, K. L. (2011). Technical Updates to the Bacterial Method for Nitrate Isotopic Analyses. Analytical Chemistry, 83(5), 1850–1856. doi:10.1021/ac1028984