Schulz, Gesa; Penopp, Jan (2025): Dual Nitrate Stable Isotopes of SONNE 305 cruise in the East Equatorial Indian Ocean and Bay of Bengal [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.983257
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Published: 2025-06-26 • DOI registered: 2025-07-25
Abstract:
This dataset includes dual nitrate stable isotope collected at 21 stations of the R/V Sonne cruise SO305 BIOCAT-IIOE2 (10 April – 22 May 2024). Samples were collected at 21 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 Bay of Bengal and East Equatorial Indian Ocean.
Supplement to:
Schulz, Gesa; Dähnke, Kirstin; Sanders, Tina; Penopp, Jan; Bange, Hermann W; Czeschel, Rena; Gaye, Birgit (2025): Nitrogen dynamics and nitrate stable isotopes indicate nitrogen loss in the Bay of Bengal. Biogeosciences, 22(20), 5943-5959, https://doi.org/10.5194/bg-22-5943-2025
Related to:
Bange, Hermann W; Stoltenberg, Ina; Andersch, Tjark; Arévalo-Martínez, Damian L; Atlas, Elliot L; Babu Suja, Arun; Barbot, Antoine; Barthelmeß, Theresa; Becker, Kevin W; Booge, Dennis; Bristow, Laura Anne; Conventz, Anja; Czeschel, Rena; Dähnke, Kirstin; Deshmukh, Shravan; Duerkop, Felix; Eisnecker, Paula; Engel, Anja; Engelen, Bert; Feil, Hendrik; Fernández-Juárez, Victor; Firus, Albert; Frank, Martin; Gaye, Birgit; Gledhill, Martha; Golde, Sandra; Großelindemann, Hendrik; Hathorne, Edmund; Henning, Silvia; Hentschel, Isabell; Herrmann, Hartmut; Ingeniero, Riel Carlo O; Jacobsen, Mats; Kiko, Rainer; Lahajnar, Niko; Lange, K; Löscher, Carolin Regina; Marandino, Christa A; McKellar, Clara; Mickenbecker, Julia; Müller, Mario; Müller, Thomas; Nazzari, Leandro; Nielsen, Lubrina; Ploschke, Jule; Pohlker, Mira; Pontiller, Benjamin; Poulain, Laurent; Quack, Birgit; Rabe, René; Roa, Jon; Rolfes, Sönke; Sanders, Tina; Schlangen, Isabell; Schmidt, Leon; Schulz, Gesa; Sommer, Marcel; Thamdrup, Bo; Usinger, Jannis; van Bonn, Laurenz; van Pinxteren, Manuela; Zhong, Qingwen (2024): Biogeochemistry/atmosphere processes in the Bay of Bengal: A contribution to the 2nd International Indian Ocean Expedition, Cruise No. SO305
10 April - 22 May 2024, Colombo (Sri Lanka) - Singapore (Singapore). SONNE-Berichte, Begutachtungspanel Forschungsschiffe, SO305, 86 pp, https://doi.org/10.48433/cr_so305
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
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. 03G0305A: SO305 - BIOCAT-IIEO2: Biogeochemische und Atmosphären Prozesse im Golf von Bengalen - Ein Beitrag zur International Indian Ocean Expedition 2 ; Vorhaben: Der Kohlenstoffkreislauf
Bundesministerium für Bildung und Forschung, Bonn (BMBF), grant/award no. 03G0305B: SO305 - BIOCAT-IIEO2: Biogeochemische und Atmosphären Prozesse im Golf von Bengalen - Ein Beitrag zur International Indian Ocean Expedition 2; Vorhaben: Der Stickstoffkreislauf
Coverage:
Median Latitude: 9.410750 * Median Longitude: 87.710996 * South-bound Latitude: -0.999640 * West-bound Longitude: 83.997420 * North-bound Latitude: 15.999970 * East-bound Longitude: 89.602340
Date/Time Start: 2024-04-17T05:48:12 * Date/Time End: 2024-05-11T00:34:35
Minimum DEPTH, water: 36.0 m * Maximum DEPTH, water: 4481.8 m
Event(s):
SO305_2-1 * Latitude: -0.999600 * Longitude: 88.670350 * Date/Time: 2024-04-17T05:47:34 * Elevation: -4311.9 m * Campaign: SO305 (BIOCAT-IIEO2) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO)
SO305_2-6 * Latitude: -0.999100 * Longitude: 88.670170 * Date/Time: 2024-04-17T14:39:31 * Elevation: -4307.0 m * Campaign: SO305 (BIOCAT-IIEO2) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO)
SO305_4-1 * Latitude: -0.025400 * Longitude: 88.670020 * Date/Time: 2024-04-18T02:17:19 * Elevation: -4512.4 m * Campaign: SO305 (BIOCAT-IIEO2) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO)
Comment:
Biogeochemistry-Atmosphere Processes in the Bay of Bengal: A contribution to the International Indian Ocean Expedition 2, Web: https://www.geo.uni-hamburg.de/en/geologie/forschung/biogeochemie/biocat.html
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 | Sampling 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, quality flag: 0 |
| 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, quality flag: 0 |
| 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, quality flag: 0 |
| 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, quality flag: 0 |
| 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:
2770 data points
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