Methane emission from high-intensity marine gas seeps in the Black Sea into the atmosphere.

Schmale, Oliver, Greinert, Jens and Rehder, Gregor (2005) Methane emission from high-intensity marine gas seeps in the Black Sea into the atmosphere. Open Access Geophysical Research Letters, 32 . L07609. DOI 10.1029/2004GL021138.

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Abstract

Submarine high‐intensity methane seeps have been surveyed in the Sorokin Trough and Paleo Dnepr Area in the Black Sea from May to June, 2003 to estimate the sea‐air methane flux. The Sorokin Trough mud volcano area in around 2080 m water depth shows no direct effects on the methane concentration in the surface water and the atmosphere (average methane saturation ratios (SR) of 143%). The average sea‐air methane flux can be determined as 0.2–0.57 nmol m−2 s−1, using two different sea‐air gas exchange models; mean wind speed were extraordinary low throughout the cruise (1.16 m s−1). The investigations in the Paleo Dnepr Area (60 to 800 m water depth) reflects a more diverse pattern. Spots of high methane concentrations in the surface water have been recorded above a seep location in around 90 m water depth (SR up to 294%). The air‐sea methane flux above this seep site (0.96–2.32 nmol m−2 s−1) is 3 times higher than calculated for the surrounding shelf (0.32–0.77 nmol m−2 s−1) and 5 times higher than assessed for open Black Sea waters (water depth > 200 m, 0.19–0.47 nmol m−2 s−1).

Document Type: Article
Keywords: Methane emission, marine gas seeps, Black Sea
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2004GL021138
ISSN: 0094-8276
Projects: CRIMEA
Date Deposited: 03 Dec 2008 16:50
Last Modified: 28 Mar 2018 09:49
URI: http://oceanrep.geomar.de/id/eprint/5234

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