Schulz, Gesa; Penopp, Jan; Sanders, Tina; Keuter, Sabine; Gök, Irmak; Dähnke, Kirstin (2025): Dual Nitrate Stable Isotopes of SONNE 303 BIOGIN-IIOE2 cruise in the Equatorial Indian Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.987975
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Published: 2025-12-18 • DOI registered: 2026-01-16
Abstract:
This dataset includes dual nitrate stable isotope collected at 13 stations of the R/V Sonne cruise SO303 BIOGIN-IIOE2 (23 January – 19 February 2024). Samples were collected at 13 stations at selected water depths from Niskin Bottles attached to the CTD. Dual nitrate stable isotopes were measured during the denitrifier method. This data was used to study nitrogen cycling in the Equatorial Indian Ocean.
Related to:
Gaye, Birgit; Andersch, Tjark; Bartsch, Peggy; Cosmus, Hannes; Dähnke, Kirstin; Dasbach, Dorothee; Eisnecker, Paula; Gök, Irmak; Harms, Natalie; Hubert-Huard, Raphaël; Hüge, Fabian; John, Finn; Keuter, Sabine; Kretzschmann, Lisett; Lahajnar, Niko; Lisitano, Luisa; Lüdmann, Thomas; Markfort, Greta; Meiritz, Luisa Chiara; Oldhaver, Manja; Penopp, Jan; Prien, Ralf D; Rixen, Tim; Ruda, Luise; Sanders, Tina; Schulz, Gesa; Schulz, Hartmut; Siccha, Michael; Sommer, Marcel; Sorge, Yves; Waniek, Joanna J (2024): BIOGeochemistry in the equatorial INdian Ocean - BIOGIN-IIOE2, Cruise No. SO303, 23.01.2024 - 19.02.2024, La Réunion (France) - Colombo (Sri Lanka). SONNE-Berichte, Begutachtungspanel Forschungsschiffe, SO303, 81 pp, https://doi.org/10.48433/cr_so303
References:
Casciotti, Karen L; Sigman, Daniel M; Galanter Hastings, M; Böhlke, John Karl; 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, https://doi.org/10.1021/ac020113w
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
Sigman, Daniel M; Casciotti, Karen L; Andreani, Muriel; Barford, C; Galanter, M; Böhlke, John Karl (2001): A Bacterial Method for the Nitrogen Isotopic Analysis of Nitrate in Seawater and Freshwater. Analytical Chemistry, 73(17), 4145-4153, https://doi.org/10.1021/ac010088e
Funding:
Bundesministerium für Bildung und Forschung, Bonn (BMBF), grant/award no. 03G0303A: SO303 - BIOCAN-IIEO2: Biogeochemie des Kohlenstoffs und Stickstoffs im Arabischen Meer - ein Beitrag zur Internationalen Indian Ocean Expedition 2; Vorhaben: Stickstoffkreislauf und Koordination
Bundesministerium für Bildung und Forschung, Bonn (BMBF), grant/award no. 03G0303B: SO303 - BIOCAN-IIEO2: Biogeochemie des Kohlenstoffs und Stickstoffs im Arabischen Meer - ein Beitrag zur Internationalen Indian Ocean Expedition 2; Vorhaben: Entwicklung der Sauerstoffminimumzone
Coverage:
Median Latitude: -3.917022 * Median Longitude: 72.801262 * South-bound Latitude: -15.021900 * West-bound Longitude: 67.465000 * North-bound Latitude: 3.000600 * East-bound Longitude: 80.000650
Date/Time Start: 2024-01-27T06:44:38 * Date/Time End: 2024-02-15T19:30:36
Minimum DEPTH, water: 39.940 m * Maximum DEPTH, water: 4963.100 m
Event(s):
SO303_1-3 * Latitude: -15.000100 * Longitude: 67.499883 * Date/Time: 2024-01-27T06:37:56 * Elevation: -2968.6 m * Location: Indian Ocean * Campaign: SO303 (BIOGIN (IIEO2)) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO)
SO303_1-5 * Latitude: -14.999967 * Longitude: 67.500000 * Date/Time: 2024-01-27T09:14:20 * Elevation: -2968.9 m * Location: Indian Ocean * Campaign: SO303 (BIOGIN (IIEO2)) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Schulz, Gesa | |||
| 2 | Station label | Station | Schulz, Gesa | |||
| 3 | Event label | Event | Schulz, Gesa | |||
| 4 | DEPTH, water | Depth water | m | Schulz, Gesa | Geocode | |
| 5 | LATITUDE | Latitude | Schulz, Gesa | Geocode | ||
| 6 | LONGITUDE | Longitude | Schulz, Gesa | Geocode | ||
| 7 | DATE/TIME | Date/Time | Schulz, Gesa | Geocode – UTC | ||
| 8 | Device type | Device | Schulz, Gesa | Device | ||
| 9 | δ15N, nitrite + nitrate | δ15N NO2+NO3 | ‰ air | Schulz, Gesa | Measurement as N2O using isotope-ratio mass spectrometry (IRMS). Bacterial conversion to N2O, so called Denitrifier-method (according to Sigman et al. 2001; Casciotti et al. 2002). Average of the measurement of 2 replicates | measured in water column |
| 10 | δ15N, nitrite + nitrate, standard deviation | δ15N NO2+NO3 std dev | ± | Schulz, Gesa | ||
| 11 | δ18O, nitrite + nitrate | δ18O NO2+NO3 | ‰ SMOW | Schulz, Gesa | Measurement as N2O using isotope-ratio mass spectrometry (IRMS). Bacterial conversion to N2O, so called Denitrifier-method (according to Sigman et al. 2001; Casciotti et al. 2002). Average of the measurement of 2 replicates | measured in water column |
| 12 | δ18O nitrite + nitrate, standard deviation | δ18O NO2+NO3 std dev | ± | Schulz, Gesa | ||
| 13 | δ15N, nitrate | δ15N NO3 | ‰ air | Schulz, Gesa | Measurement as N2O using isotope-ratio mass spectrometry (IRMS). Bacterial conversion to N2O, so called Denitrifier-method (according to Sigman et al. 2001; Casciotti et al. 2002). Average of the measurement of 2 replicates | measured in water column; If nitrite concentration exceeded 5 % of nitrate+nitrite, it was removed prior to analysis using sulfamic acid (Granger & Sigman, 2009), to get nitrate isotope signatures. |
| 14 | δ15N, nitrate, standard deviation | δ15N NO3 std dev | ± | Schulz, Gesa | ||
| 15 | δ18O, nitrate | δ18O NO3 | ‰ SMOW | Schulz, Gesa | Measurement as N2O using isotope-ratio mass spectrometry (IRMS). Bacterial conversion to N2O, so called Denitrifier-method (according to Sigman et al. 2001; Casciotti et al. 2002). Average of the measurement of 2 replicates | measured in water column; If nitrite concentration exceeded 5 % of nitrate+nitrite, it was removed prior to analysis using sulfamic acid (Granger & Sigman, 2009), to get nitrate isotope signatures. |
| 16 | δ18O, nitrate, standard deviation | δ18O NO3 std dev | ± | Schulz, Gesa |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1970 data points