Abstract
The chemical composition of cloud/fog-water, particulate matter and gas phase has beenmeasured during several fog events. The measurements took place in the Black Forest/Germany, in the Vosges Mountains/France, and in the Rhine Valley near Karlsruhe (Lammel and Metzig, 1991). In this paper emphasis will be put on the observation out of the fog event in the Vosges Mountain near Mount Le Donon. A cloud intercepted the site during 6 h beginning 28.03. 1990, 20:30.The chemical composition of the cloudwater was dominated by ammonium, nitrate, sulfate and free acidity. The pH values of the cloud water samples were ranging from 2.8 to 4.7. By average organic acids contributed 11 % to the cloudwater acidity. The main constituents of the particulate matter were carbon, ammonia, nitrate and sulfate (on a mass per mass base). The cloud event changed the chemical composition of the particulate matter significantly. During the cloud event the interstitial aerosol was enriched in carbon. Afterwards acidity increased, while nitrate was below detection limit. However, no information is available about the relative significance of transport from the source regions to the site and source strength on one hand, and microphysical and chemical processes in the multiphase system on the other hand.
Published Version
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