Choisnard, Noémie; Lemke, Josephin; Voss, Maren: Nitrate dual isotopes and nitrification rates in central Chile [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.986751 (dataset in review)
Abstract:
This dataset presents data collected along a four-station transect sampled in January 2023 in the upwelling system offshore of Chile (36°S) during the MAPUCHE cruise SO296-2 aboard the R/V Sonne. Phosphate, nitrite, ammonium and nitrate concentrations were analyzed. Nitrate plus nitrite and nitrate δ15N (vs. AIR) and δ18O (vs. VSMOW) measurements have been performed using the denitrifier method (Weigand et al., 2016) on seawater samples. Samples for nitrate δ15N and δ18O were treated with sulfamic acid before isotope analysis to remove nitrite (Granger and Sigman, 2009). δ18O-nitrate values were additionally corrected for the changes in salinity (Knapp et al., 2008).δ15N-nitrite values were calculated using a mass balance and δ15N values before and after nitrite removal. This dataset also includes values of nitrification rates, measured using the tracer incubation method (Damashek et al., 2016).
Keyword(s):
Supplement to:
Choisnard, Noémie; Lemke, Josephin; Fabian, Jenny; Liskow, Iris; Schulz-Vogt, Heide N; Voss, Maren (submitted): Nitrate dual isotopes and nitrification rates in central Chile.
References:
Damashek, Julian; Casciotti, Karen L; Francis, Christopher A (2016): Variable Nitrification Rates Across Environmental Gradients in Turbid, Nutrient-Rich Estuary Waters of San Francisco Bay. Estuaries and Coasts, 39(4), 1050-1071, https://doi.org/10.1007/s12237-016-0071-7
Granger, Julie; Sigman, Daniel 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, https://doi.org/10.1002/rcm.4307
Weigand, Mira Alexandra; Foriel, Julien; Barnett, Bruce; Oleynik, Sergey; Sigman, Daniel M (2016): Updates to instrumentation and protocols for isotopic analysis of nitrate by the denitrifier method. Rapid Communications in Mass Spectrometry, 30(12), 1365-1383, https://doi.org/10.1002/rcm.7570
Project(s):
Coverage:
Median Latitude: -36.495017 * Median Longitude: -73.200008 * South-bound Latitude: -36.545100 * West-bound Longitude: -73.383300 * North-bound Latitude: -36.433267 * East-bound Longitude: -73.049900
Date/Time Start: 2023-01-24T04:51:00 * Date/Time End: 2023-01-28T03:46:00
Minimum Elevation: -119.0 m * Maximum Elevation: -60.5 m
Event(s):
SO296/2_19-1 * Latitude: -36.485583 * Longitude: -73.232617 * Date/Time: 2023-01-24T04:51:00 * Elevation: -116.0 m * Location: South Pacific Ocean * Campaign: SO296/2 (MAPUCHE) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO) * Comment: Station 22
SO296/2_26-3 (Station_18) * Latitude: -36.516117 * Longitude: -73.134217 * Date/Time: 2023-01-24T16:34:00 * Elevation: -94.2 m * Location: South Pacific Ocean * Campaign: SO296/2 (MAPUCHE) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO) * Comment: Station 18; Pump-CTD
SO296/2_30-2 (Station_26) * Latitude: -36.433267 * Longitude: -73.383300 * Date/Time: 2023-01-26T03:10:00 * Elevation: -119.0 m * Location: South Pacific Ocean * Campaign: SO296/2 (MAPUCHE) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO) * Comment: Station 26; Pump-CTD
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
693 data points