Distribution of methane in the water column of the Baltic Sea

Details Distribution of methane in the water column of the Baltic Sea Distribution of methane in the water column of the Baltic Sea

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3712604s&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 12, CiteID L12604

Mathematics

Logic

Biogeosciences: Trace Gases, Geochemistry: Marine Geochemistry (4835, 4845, 4850), Oceanography: General: Marginal And Semi-Enclosed Seas, Oceanography: Biological And Chemical: Gases, Biogeosciences: Carbon Cycling (4806)

Scientific paper

The distribution of dissolved methane in the water column of the Baltic Sea was extensively investigated. A strong correlation between the vertical density stratification, the distribution of oxygen, hydrogen sulfide, and methane has been identified. A widespread release of methane from the seafloor is indicated by increasing methane concentrations with water depth. The deep basins in the central Baltic Sea show the strongest methane enrichments in stagnant anoxic water bodies (max. 1086 nM and 504 nM, respectively), with a pronounced decrease towards the pelagic redoxcline and slightly elevated surface water concentrations (saturation values of 206% and 120%, respectively). In general the more limnic basins in the northern part of the Baltic are characterized by lower water column methane concentrations and surface water saturation values close to the atmospheric equilibrium (between 106% and 116%). In contrast, the shallow Western Baltic Sea is characterized by high saturation values up to 746%.

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