Seasonal variations of atmospheric sulfur dioxide and dimethylsulfide concentrations at Amsterdam Island in the southern Indian Ocean |
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| Authors: | J P Putaud N Mihalopoulos B C Nguyen J M Campin S Belviso |
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| Institution: | (1) Laboratoire mixte CNRS-CEA, Centre des Faibles Radioactivités, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France |
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| Abstract: | Daily measurements of atmospheric sulfur dioxide (SO2) concentrations were performed from March 1989 to January 1991 at Amsterdam Island (37°50 S–77°30 E), a remote site located in the southern Indian Ocean. Long-range transport of continental air masses was studied using Radon (222Rn) as continental tracer. Average monthly SO2 concentrations range from less than 0.2 to 3.9 nmol m-3 (annual average = 0.7 nmol m-3) and present a seasonal cycle with a minimum in winter and a maximum in summer, similar to that described for atmospheric DMS concentrations measured during the same period. Clear diel correlation between atmospheric DMS and SO2 concentrations is also observed during summer. A photochemical box model using measured atmospheric DMS concentrations as input data reproduces the seasonal variations in the measured atmospheric SO2 concentrations within ±30%. Comparing between computed and measured SO2 concentrations allowed us to estimate a yield of SO2 from DMS oxidation of about 70%. |
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| Keywords: | Sulfur dioxide SO2 dimethylsulfide DMS marine atmosphere seasonal variation |
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