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

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

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3207609s&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 7, CiteID L07609

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17

Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Geochemistry: Marine Geochemistry (4835, 4845, 4850), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Oceanography: Biological And Chemical: Gases, Geographic Location: Large Bodies Of Water (E.G., Lakes And Inland Seas) (0746)

Scientific paper

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).

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