Arévalo-Martínez, Damian L; Sommer, Marcel; Bange, Hermann W; Eisnecker, Paula; Schulz, Gesa; Stoltenberg, Ina (2025): Surface dissolved nitrous oxide concentrations during SONNE cruise SO303 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.983958
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Published: 2025-08-18 • DOI registered: 2025-09-16
Abstract:
The dataset comprises high-resolution (1-min) measurements of dissolved nitrous oxide in surface waters of the Eastern Tropical Indian Ocean. The observations were conducted during the expedition SO-303 on board R/V SONNE (January-February 2024). Seawater was drawn on board by means of a submersible pump installed at 6 m depth, and measurements of equilibrated headspace were carried out as described in Arévalo-Martínez et al. (2013): https://doi.org/10.5194/os-9-1071-2013.
Supplement to:
Sommer, Marcel; Bange, Hermann W; Eisnecker, Paula; Schulz, Gesa; Stoltenberg, Ina; Arévalo-Martínez, Damian L (2025): N2O Emissions From the Eastern Tropical Indian Ocean. Geophysical Research Letters, 52(22), https://doi.org/10.1029/2025GL117627
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
Coverage:
Median Latitude: 0.096506 * Median Longitude: 79.619712 * South-bound Latitude: -4.000200 * West-bound Longitude: 77.390100 * North-bound Latitude: 3.007600 * East-bound Longitude: 80.113400
Date/Time Start: 2024-02-10T02:06:00 * Date/Time End: 2024-02-16T07:20:00
Event(s):
SO303-track * Latitude Start: -20.164467 * Longitude Start: 57.424958 * Latitude End: 6.960600 * Longitude End: 79.855645 * Date/Time Start: 2024-01-10T00:00:02 * Date/Time End: 2024-02-19T06:50:00 * Campaign: SO303 (BIOGIN (IIEO2)) * Basis: Sonne_2 * Method/Device: Underway cruise track measurements (CT) * Comment: Port Louis - Colombo
Comment:
OA-ICOS Analyzer coupled to shower head equilibrator as in Arévalo-Martínez et al. (2013): https://doi.org/10.5194/os-9-1071-2013. Equilibration temperature measured with a FLUKE 1524 reference thermometer (+/-0.01°C). Sea surface temperature and salinity derived from discrete in-situ measurements with a Seabird SBE45 (Temperature: +/-0.002°C; Conductivity: ± 0.0003 S/m). The gaps in equilibration temperature caused by logger malfunction were filled based on the linear correlation with SST (equ_temp_calc=0.9051*SST + 2.167).
Atmospheric mixing ratio obtained by adding the monthly mean at Mahe Island-Seychelles Station (Latitude: 4.6824° South, Longitude: 55.5325° East, Elevation: 2.00 masl) for February 2023, to the annual increase in atmospheric N2O mixing ratio (xn2o_atm=337.7525 nmol/mol + 1.12 nmol/mol). Data was obtained from NOAA's Atmospheric Cooperative Sampling Network (upon usage, citation should be: Lan, X., J.W. Mund, A.M. Crotwell, K.W. Thoning, E. Moglia, M. Madronich, K. Baugh, G. Petron, M.J. Crotwell, D. Neff, S. Wolter, T. Mefford and S. DeVogel (2024), Atmospheric Nitrous Oxide Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 1997-2023, Version: 2024-07-30, https://doi.org/10.15138/53g1-x417).
Partial pressures and concentrations of N2O in the atmosphere were estimated as explained in Arévalo-Martínez et al. (2013): https://doi.org/10.5194/os-9-1071-2013 and references therein.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Arévalo-Martínez, Damian L | Geocode | ||
| 2 | LONGITUDE | Longitude | Arévalo-Martínez, Damian L | Geocode | ||
| 3 | LATITUDE | Latitude | Arévalo-Martínez, Damian L | Geocode | ||
| 4 | Temperature at equilibration | Tequ | °C | Arévalo-Martínez, Damian L | ||
| 5 | Sea surface temperature | SST | °C | Arévalo-Martínez, Damian L | ||
| 6 | Sea surface salinity | SSS | Arévalo-Martínez, Damian L | |||
| 7 | Nitrous oxide, dry-air mole fraction | N2O | nmol/mol | Arévalo-Martínez, Damian L | seawater | |
| 8 | Nitrous oxide, partial pressure | pN2O | natm | Arévalo-Martínez, Damian L | seawater | |
| 9 | Nitrous oxide, partial pressure | pN2O | natm | Arévalo-Martínez, Damian L | Calculated | air |
| 10 | Nitrous oxide, dissolved | N2O | nmol/l | Arévalo-Martínez, Damian L | seawater | |
| 11 | Nitrous oxide | N2O | nmol/l | Arévalo-Martínez, Damian L | Calculated | air |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
105456 data points
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