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Kock, Annette; Gebhardt, Sarah; Bange, Hermann Werner (2008): Underway CH4 measurements during POSEIDON cruise POS348. IFM-GEOMAR Leibniz-Institute of Marine Sciences, Kiel University, PANGAEA,, In supplement to: Kock, A et al. (2008): Methane emissions from the upwelling area off Mauritania (NW Africa). Biogeosciences, 5(4), 1119-1125,

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Further details:
Kock, Annette; Gebhardt, Sarah; Bange, Hermann Werner (2007): Underway CH4 measurements during POSEIDON cruise POS320/1. PANGAEA,
Median Latitude: 19.850758 * Median Longitude: -17.324213 * South-bound Latitude: 18.000000 * West-bound Longitude: -18.010000 * North-bound Latitude: 24.360000 * East-bound Longitude: -16.260000
Date/Time Start: 2007-02-19T03:39:00 * Date/Time End: 2007-02-24T15:03:00
Minimum DEPTH, water: m * Maximum DEPTH, water: m
POS348-track * Latitude Start: 28.132300 * Longitude Start: -15.421900 * Latitude End: 28.132300 * Longitude End: -15.421900 * Date/Time Start: 2007-02-08T00:00:00 * Date/Time End: 2007-02-26T00:00:00 * Location: Northeast Atlantic * Campaign: POS348 * Basis: Poseidon * Method/Device: Underway cruise track measurements (CT) * Comment: Las Palmas - Las Palmas
Coastal upwelling regions have been identified as sites of enhanced CH4 emissions to the atmosphere. The coastal upwelling area off Mauritania (NW Africa) is one of the most biologically productive regions of the world's ocean but its CH4 emissions have not been quantified so far. More than 1000 measurements of atmospheric and dissolved CH4 in the surface layer in the upwelling area off Mauritania were performed as part of the German SOPRAN (Surface Ocean Processes in the Anthropocene) study during two cruises in March/April 2005 (P320/1) and February 2007 (P348). During P348 enhanced CH4 saturations of up to 200% were found close to the coast and were associated with upwelling of South Atlantic Central Water. An area-weighted, seasonally adjusted estimate yielded overall annual CH4 emissions in the range from 1.6 to 2.9 Gg CH4. Thus the upwelling area off Mauritania represents a regional hot spot of CH4 emissions but seems to be of minor importance for the global oceanic CH4 emissions.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Sample code/labelSample labelBange, Hermann Werner
2DATE/TIMEDate/TimeBange, Hermann WernerGeocode
3LATITUDELatitudeBange, Hermann WernerGeocode
4LONGITUDELongitudeBange, Hermann WernerGeocode
5Depth, bathymetricBathy depthmBange, Hermann Werner
6DEPTH, waterDepth watermBange, Hermann WernerGeocode
7SalinitySalBange, Hermann Werner
8Temperature, waterTemp°CBange, Hermann Werner
9MethaneCH4relative unitsBange, Hermann Werner
10MethaneCH4nmol/lBange, Hermann WernerMethane, dissolved
11SaturationSatur%Bange, Hermann WernerMethane, dissolved
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