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Niewöhner, Christine; Hensen, Christian; Kasten, Sabine; Zabel, Matthias; Schulz, Horst D (1998): Methane and hydrogen sulfide in porewater of sediment cores from the upwelling area off Namibia. PANGAEA, https://doi.org/10.1594/PANGAEA.730425, Supplement to: Niewöhner, C et al. (1998): Deep sulfate reduction completely mediated by anaerobic methane oxidation in sediments of the upwelling area off Namibia. Geochimica et Cosmochimica Acta, 62(3), 455-464, https://doi.org/10.1016/S0016-7037(98)00055-6

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Abstract:
Porewater concentrations of sulfate, methane, and other relevant constituents were determined on four sediment cores from the high productivity upwelling area off Namibia which were recovered from the continental slope at water depths of 1300 and 2000 m. At all four stations a distinct sulfate-methane transition zone was observed several meters below the seafloor in which both sulfate and methane are consumed. Nutrient porewater concentration profiles do not show gradient slope changes at the depths of the transition zones. Flux calculations carried out on the basis of the determined porewater profiles revealed that anaerobic methane oxidation accounts for 100% of deep sulfate reduction within the sulfate-methane transition zone and consumes the total net diffusive sulfate flux. A significant contribution of organic carbon oxidation to the reduction of sulfate at these depths could, therefore, be excluded. We state that porewater profiles of sulfate with constant gradients above the transition zones are indicative for anaerobic methane oxidation controlling sulfate reduction.
Project(s):
South Atlantic in Late Quaternary: Reconstruction of Budget and Currents (SFB261)
Coverage:
Median Latitude: -22.298750 * Median Longitude: 12.395833 * South-bound Latitude: -25.518333 * West-bound Longitude: 10.998333 * North-bound Latitude: -17.160000 * East-bound Longitude: 13.230000
Date/Time Start: 1996-01-31T00:00:00 * Date/Time End: 1996-02-11T00:00:00
Event(s):
GeoB3703-8 * Latitude: -25.518333 * Longitude: 13.230000 * Date/Time: 1996-01-31T00:00:00 * Elevation: -1369.0 m * Recovery: 11.36 m * Location: Northern Cape Basin * Campaign: M34/2 * Basis: Meteor (1986) * Device: Gravity corer (Kiel type) (SL) * Comment: FGB
GeoB3707-8 * Latitude: -21.623333 * Longitude: 12.191667 * Date/Time: 1996-02-03T00:00:00 * Elevation: -1353.0 m * Location: Northern Cape Basin * Campaign: M34/2 * Basis: Meteor (1986) * Device: Gravity corer (Kiel type) (SL)
GeoB3714-9 * Latitude: -17.160000 * Longitude: 10.998333 * Date/Time: 1996-02-07T00:00:00 * Elevation: -2060.0 m * Recovery: 12.41 m * Location: Northern Cape Basin * Campaign: M34/2 * Basis: Meteor (1986) * Device: Gravity corer (Kiel type) (SL) * Comment: FGB
Size:
4 datasets

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