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Bussmann, Ingeborg; Gentz, Torben; Kasten, Sabine (2025): Dissolved methane concentrations and oxidation rates around South Georgia, in summer 2022 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.984658

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Published: 2025-09-10 • DOI registered: 2025-10-09

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Abstract:
On the cruise PS133/2 water samples were taken from the rosette and filled without bubbles into 120 ml glass bottles. Samples were taken from surface water and several depths down to the bottom. Water samples were analysed for dissolved methane concentration, methane oxidation rate and the diffusive flux was calculated. CH4 concentrations were determined on board in duplicate by gas chromatography with the head space method (Magen et al. 2014). Methane oxidation rates were determined on board in triplicate with tritium labelled methane according to Bussmann et al 2015. To calculate the diffusive methane flux between sea water and atmosphere based on the equation of Ho et al al 2006, we used the water temperature and salinity from the ship's CTD for the methane solubility (Wiesenburg, Guinasso, 1979); wind speed from the ship's weather station which was corrected for 10 m height, and the atmospheric CH4 concentration was taken from https://doi.pangaea.de/10.1594/PANGAEA.983729 .
Keyword(s):
dissolved methane concentration; methane oxidation rate; PS133/2
Related to:
Bussmann, Ingeborg; Kasten, Sabine (2025): Atmospheric methane concentrations on RV POLARSTERN cruise PS133/2, in 2022, from Punta Arenas to Cape Town [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.983729
Kasten, Sabine (2023): The Expedition PS133/2 of the Research Vessel POLARSTERN to the Scotia Sea in 2022. Berichte zur Polar- und Meeresforschung = Reports on Polar and Marine Research, 775, 183 pp, https://doi.org/10.57738/BzPM_0775_2023
References:
Bussmann, Ingeborg; Matousu, Anna; Osudar, Roman; Mau, Susan (2015): Assessment of the radio 3H-CH4 tracer technique to measure aerobic methane oxidation in the water column. Limnology and Oceanography-Methods, 13(6), 312-327, https://doi.org/10.1002/lom3.10027
Ho, David T; Law, Cliff S; Smith, M J; Schlosser, Peter; Harvey, Mike; Hill, Peter (2006): Measurements of air-sea gas exchange at high wind speeds in the Southern Ocean: Implications for global parameterizations. Geophysical Research Letters, 33(16), 2006GL026817, https://doi.org/10.1029/2006GL026817
Magen, Cédric; Lapham, Laura L; Pohlman, John W; Marshall, K; Bosman, Samantha; Casso, Michael; Chanton, Jeffrey P (2014): A simple headspace equilibration method for measuring dissolved methane. Limnology and Oceanography-Methods, 12(9), 637-650, https://doi.org/10.4319/lom.2014.12.637
Wiesenburg, Denis A; Guinasso Jr., Norman L (1979): Equilibrium solubilities of methane, carbon monoxide, and hydrogen in water and sea water. Journal of Chemical and Engineering Data, 24(4), 356-360, https://doi.org/10.1021/je60083a006
Funding:
Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven (AWI), grant/award no. AWI_PS133/2_06: Methane - Water Column and Sediment
Coverage:
Median Latitude: -54.173633 * Median Longitude: -36.927687 * South-bound Latitude: -54.401000 * West-bound Longitude: -38.140000 * North-bound Latitude: -53.770000 * East-bound Longitude: -35.828000
Date/Time Start: 2022-11-26T10:52:39 * Date/Time End: 2022-12-07T20:06:30
Minimum DEPTH, water: 1.821 m * Maximum DEPTH, water: 357.649 m
Event(s):
PS133/2_9-1 * Latitude: -53.769861 * Longitude: -38.140415 * Date/Time: 2022-11-26T10:52:39 * Elevation: -379.3 m * O2A Registry URI: https://registry.o2a-data.de/items/5460 * Location: South Atlantic Ocean * Campaign: PS133/2 (Island Impact) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO)
PS133/2_11-1 * Latitude: -54.035648 * Longitude: -37.056805 * Date/Time: 2022-11-26T19:12:40 * Elevation: -249.2 m * O2A Registry URI: https://registry.o2a-data.de/items/5460 * Location: South Atlantic Ocean * Campaign: PS133/2 (Island Impact) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO)
PS133/2_15-1 * Latitude: -54.084192 * Longitude: -37.099950 * Date/Time: 2022-11-27T14:03:54 * Elevation: -358.9 m * O2A Registry URI: https://registry.o2a-data.de/items/5460 * Location: South Atlantic Ocean * Campaign: PS133/2 (Island Impact) * Basis: Polarstern * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventBussmann, Ingeborg
2Cruise/expeditionExpeditionBussmann, Ingeborg
3Station labelStationBussmann, Ingeborg
4Bottle numberBottle#Bussmann, Ingeborg
5DATE/TIMEDate/TimeBussmann, IngeborgGeocode
6LONGITUDELongitudeBussmann, IngeborgGeocode
7LATITUDELatitudeBussmann, IngeborgGeocode
8DEPTH, waterDepth watermBussmann, IngeborgGeocode
9MethaneCH4nmol/lBussmann, Ingeborg
10Turnover rateTurn rate1/hBussmann, Ingeborg
11Turnover rate, standard deviationk std dev±Bussmann, Ingeborg
12Methane, oxidation rateMOXnmol/l/dayBussmann, Ingeborg
13Methane, oxidation rate, standard deviationMOX std dev±Bussmann, Ingeborg
14Methane, flux, diffusiveCH4 flux diffµmol/m2/dayBussmann, Ingeborg
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:
2266 data points

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