Relation between the concentrations of DMS in surface seawater and air in the temperate North Pacific region |
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| Authors: | Shuichi Watanabe Hiroshi Yamamoto Shizuo Tsunogai |
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| Institution: | (1) Department of Chemistry, Graduate School of Fisheries Sciences, Hokkaido University, 041 Hakodate, Japan;(2) Laboratory of Marine and Atmospheric Geochemistry, Graduate School of Environmental Earth Science, Hokkaido University, 060 Sapporo, Japan |
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| Abstract: | The concentrations of DMS were simultaneously measured in both water and air at the sea surface on board a vessel during a trans-Pacific cruise around 40° N in August 1988. Those in the surface seawater varied widely with a mean of 162 ng S/1 and a standard deviation of 134 ng S/1 (n=37), but the variation was not a mere fluctuation and the high concentration (376 ng S/1) was found in the area between 145° W and 170° W. The atmospheric DMS concentration varied more widely with a mean value of 177 ng S/m3 and a standard deviation of 203 ng S/m3 (n=23). The diurnal variation of DMS was not significant in the air near the sea surface. However, the concentrations in the surface water was fairly well correlated with those in the surface air. The correlation coefficient (r
2=0.86) was larger than that between the atmospheric concentration and outflux of DMS (r
2=0.64). These findings mean that the turnover time of DMS in the atmosphere is not extremely short. Based on the linear relation between the atmospheric and seawater DMS, the turnover time of the atmospheric DMS has been calculated to be 0.9 days with an uncertainty of around 50%. The oxidation rate agrees fairly well with that expected from the OH radical concentration in the marine atmosphere. |
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| Keywords: | dimethyl sulfide North Pacific outflux of DMS turnover time of atmospheric DMS OH radicals |
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