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Oxidation of SO2 in Clouds at Whiteface Mountain |
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| Authors: | Rattigan O V Dutkiewicz Vincent A Das Mita Judd C D Husain Liaquat |
| Institution: | (1) Department of Health, Wadsworth Center, New York State, Albany, NY, 12201-0509;(2) Department of Environmental Health and Toxicology, School of Public Health, State University of New York, Albany, NY, 12201-0509;(3) Present address: ICF Kaiser, 101 Lucas Valley Road, San Rafael, CA, 94903;(4) Department of Environmental Health and Toxicology, School of Public Health, State University of New York, Albany, NY, 12201-0509 |
| Abstract: | In-cloud oxidation of SO2 byH2O2 was investigated using a tracertechnique based on SO2– 4/Se ratios atWhiteface Mountain, New York during summer months from1990 to 1998. Cloud water samples collected at themountain's summit (1.5 km above mean sea level) andaerosols at a below cloud site (Lodge) located at 0.6km amsl and in cloud interstitial air at the summitwere analyzed for SO2– 4 and selectedtrace elements. Gaseous SO2 andH2O2were measured in realtime. Cloud water pH wasgenerally below 5.0 with a mean value of 3.6. Theresults show that significant in cloud oxidation occursin clouds during summer months varying from belowdetection to 62% with on average approximately 24% ofthe cloud water SO2– 4 produced from in-situ SO2 oxidation. During summer the clouds wereoxidant limited for approximately one third of thetime. |
| Keywords: | cloud water hydrogen peroxide in cloudoxidation sulfur dioxide sulfate |
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