Schulz, Gesa; Penopp, Jan; Metzke, Marc; Gaye, Birgit: Dual Nitrate Stable Isotopes of SONNE 305/2 cruise in the Equatorial Indian Ocean [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.988462 (dataset in review)
Abstract:
This dataset includes dual nitrate stable isotope measurements collected at 11 stations of the R/V Sonne cruise SO305/2 E-POLIO-T & M2Argo-T (16 July – 05 August 2024) along the route between Singapore and Port Louis. This data was used to study nitrogen cycling in the Equatorial Indian Ocean. Samples were collected at 11 stations at selected water depths from free flow bottles attached to the CTD. Samples were filtered (GF+SFCA, MINISART, 0.45 µM) on board and stored frozen (-20 °C) in Falcon PE tubes until analysis in the home lab. Dual nitrate stable isotopes were measured during the denitrifier method (Casciotti et al., 2002; Sigman et al., 2001) using a GasBench II coupled with an isotope ratio mass spectrometer (Delta Plus XP, Thermo Fisher Scientific). If the nitrite concentration exceeded 5 %, it was removed prior to analysis using sulfamic acid (Granger and Sigman, 2009) to get nitrate isotope signatures.
Related to:
Waniek, Joanna J; Prien, Ralf D; Reineccius, Janika; Serafim, Tassiana S G; Osterholz, Helena; Fensky, Ute; Fechtel, Christin; Floth-Peterson, Mareike; Mairon, Tabea N L; Witt, Kendra; Dellwig, Olaf; Köhler, Anne; Dierken, Madleen; Kolbe, Martin; Jeschek, Jenny; Gaye, Birgit; Leonhardt, Jonas; Metzke, Marc; Devey, Colin W; Bauer, Benedikt; Kreh, Janina; Kremin, Isabel; Zhou, Fei; Ziolkowski, Tobias; Xie, Zhiyong; Mi, Lijie (2024): Emerging Pollutants and Microplastic Abundance in Surface Waters of Indian Ocean, High-resolution seafloor Mapping and Magnetic field characterization of the Argo transform fault at the Central Indian Ridge, Cruise No. SO305/2, 16.07.2024-05.08.2024, Singapore (Singapore) - Port Louis (Mauritius). SONNE-Berichte, Begutachtungspanel Forschungsschiffe, SO305/2, 33 pp, https://doi.org/10.48433/cr_so305_2
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. 03G0305TB: SO305/2 - E-POLIO: Neue Schadstoffe und Mikroplastik im Oberflächenwasser des Indischen Ozeans; Vorhaben: Mikroplastik, Schadstoffe & Koordination
Coverage:
Median Latitude: -6.915126 * Median Longitude: 78.072584 * South-bound Latitude: -16.463600 * West-bound Longitude: 64.587617 * North-bound Latitude: 3.193567 * East-bound Longitude: 90.505583
Date/Time Start: 2024-07-21T02:13:41 * Date/Time End: 2024-08-01T12:35:21
Minimum DEPTH, water: 49.877 m * Maximum DEPTH, water: 5425.064 m
Event(s):
SO305/2_1-1 * Latitude: 3.193570 * Longitude: 90.505420 * Date/Time: 2024-07-21T02:13:41 * Elevation: -2698.1 m * Campaign: SO305/2 (E‐POLIO‐T; M2Argo‐T) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO)
SO305/2_1-2 * Latitude: 3.193500 * Longitude: 90.505520 * Date/Time: 2024-07-21T04:36:40 * Elevation: -2697.4 m * Campaign: SO305/2 (E‐POLIO‐T; M2Argo‐T) * Basis: Sonne_2 * Method/Device: CTD/Rosette (CTD-RO)
SO305/2_2-1 * Latitude: 0.668550 * Longitude: 87.640570 * Date/Time: 2024-07-22T05:17:54 * Elevation: -4450.4 m * Campaign: SO305/2 (E‐POLIO‐T; M2Argo‐T) * 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, 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; 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) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
808 data points