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- W2028825276 abstract "Biological consumption is a major sink for dimethylsulfide (DMS) in the surface ocean, but the fate of DMS is poorly known. We determined the fate of sulfur from biologically consumed DMS in samples from the upper 60 m of the Sargasso Sea during July 2004. Using tracer levels of 35S-DMS in dark incubations we found that DMS was transformed into three identifiable non-volatile, sulfur-containing product pools: dimethylsulfoxide (DMSO), sulfate, and particle-associated macromolecules. Together, DMSO and sulfate accounted for most (81–93%) of the non-volatile sulfur products. Only a small fraction (∼ 2%) of the consumed DMS-sulfur was recovered in cellular macromolecules, leaving 5–17% of the metabolic products of DMS consumption unidentified. The relative importance of the two major products varied with depth. DMSO was the main sulfur product (∼ 72%) from DMS metabolism in the surface mixed layer, whereas sulfate was the most important product (∼ 74%) below the mixed layer. Changes in temperature and photosynthetically-active radiation (PAR) did not cause shifts in DMS fate in short term incubations (7–12 h), however these or other factors (e.g., exposure to ultraviolet radiation), operating over longer time scales, could potentially influence the observed pattern of DMS fate with depth. Biological DMSO production rates ranged from 0.07 to 0.33 nM day− 1, with the highest rate found at 30 m, just below the surface mixed layer. With DMSO concentrations ranging from 4.0 to 8.6 nM, turnover times for DMSO were long (15–61 days) when only the biological production from DMS was considered. Identification of the main sulfur containing products from DMS metabolism improves understanding of this important process in the marine sulfur cycling. Detection and quantification of DMSO production from biological DMS consumption also provides a more complete picture of DMSO biogeochemistry in the ocean." @default.
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- W2028825276 date "2007-01-01" @default.
- W2028825276 modified "2023-10-02" @default.
- W2028825276 title "Depth-dependent fate of biologically-consumed dimethylsulfide in the Sargasso Sea" @default.
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- W2028825276 doi "https://doi.org/10.1016/j.marchem.2006.07.005" @default.
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