Title Distribution of methane in the water column of the Baltic Sea
Author Schmale, O.; Schneider von Deimling, J.; Gülzow, W.; Nausch, G.; Waniek, J.J.; Rehder, G.
Author Affil Schmale, O., Leibniz Institute for Baltic Sea Research Warnemünde, Rostock, Germany
Source Geophysical Research Letters, 37(12), Citation L12604. Publisher: American Geophysical Union, Washington, DC, United States. ISSN: 0094-8276
Publication Date 2010
Notes In English. 21 refs. GeoRef Acc. No: 310424
Index Terms density (mass/volume); hydrocarbons; ocean bottom; oxygen; salinity; Baltic Sea; aliphatic hydrocarbons; alkanes; anaerobic environment; Atlantic Ocean; bathymetry; climate effects; concentration; density; dissolved materials; hydrogen sulfide; methane; North Atlantic; ocean floors; organic compounds; saturation; sea water; water column
Abstract 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%.
URL http://hdl.handle.net/10.1029/2010GL043115
Publication Type journal article
Record ID 65007173