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Kock, Annette; Gebhardt, Sarah; Bange, Hermann Werner (2008): Underway CH4 measurements during POSEIDON cruises POS320/1 and POS348. PANGAEA,, 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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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.
Related to:
Bange, Hermann Werner; Shipboard Scientific Party (2005): Cruise report R.V. Poseidon, cruise PO320/1. Berichte aus dem Leibniz-Institut für Meereswissenschaften an der Christian-Albrechts-Universität zu Kiel, Germany
Median Latitude: 18.730423 * Median Longitude: -17.202322 * South-bound Latitude: 16.998300 * West-bound Longitude: -18.020000 * North-bound Latitude: 24.360000 * East-bound Longitude: -16.260000
Date/Time Start: 2005-03-27T13:50:00 * Date/Time End: 2007-02-24T15:03:00
POS320/1-track * Latitude Start: 28.132300 * Longitude Start: -15.421900 * Latitude End: 16.886100 * Longitude End: -24.997600 * Date/Time Start: 2005-03-21T00:00:00 * Date/Time End: 2005-04-07T00:00:00 * Location: Tropical NE Atlantic * Campaign: POS320/1 (06PO20050321) * Basis: Poseidon * Method/Device: Underway cruise track measurements (CT) * Comment: Las Palmas - Mindelo
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
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