Emission of dimethylsulfide from Weddell Sea leads

Mathematics – Logic

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Biogeosciences: Sulfur Cycling, Geochemistry: Marine Geochemistry (4835, 4845, 4850), Oceanography: General: Arctic And Antarctic Oceanography (9310, 9315), Oceanography: Physical: Air/Sea Interactions (0312, 3339), Oceanography: Biological And Chemical: Gases

Scientific paper

The distribution of dimethylsulfide (DMS), dimethylsulfoniopropionate (DMSP) and dimethylsulfoxide (DMSO) was examined in lead water in pack ice of the Weddell Sea. Samples were taken by pulling water into a syringe from a series of depths from 0.002 m to 4 m and deeper. Concentrations of DMS, DMSP and DMSO remained low throughout the water column relative to surface water, which was highly enriched. Concentrations of the major sulfur compounds increased by over an order of magnitude during periods with smooth surface water conditions. This increase coincided with a profound stratification of the water column, caused by a decrease in salinity of near surface water. We estimate that the DMS emission from leads and open water in Antarctic sea ice could contribute significantly to the yearly DMS flux from the Southern Ocean.

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