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Deposition of atmospheric nitrous acid on alkaline snow surfaces

Abstract : The photolysis of atmospheric nitrous acid (HONO) is a significant source of OH radicals in remote and Polar Regions. HONO is produced in/on snow surfaces in a photochemical reaction from nitrate ions. In an attempt to quantify the production of HONO at a snow covered mid-latitude location we made measurements of HONO fluxes for a 10-day period at the Mt. Cimone (MTC) research station in the Italian northern Apennines (2165 m asl) during March 2004. Production fluxes under normal background conditions were small, and reached maximum values of 20 nmol m−2 h−1 on only two occasions. However, during a transport event of Saharan dust to MTC we observed deposition fluxes of up to −120 nmol m−2 h−1 of HONO on to the snow surface. The deposited Sahara dust had rendered the surface snow alkaline, so that large amounts of acids could be absorbed from the atmosphere.
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Submitted on : Friday, February 19, 2021 - 12:35:38 PM
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H. J. Beine, A. Amoroso, G. Esposito, R. Sparapani, A. Ianniello, et al.. Deposition of atmospheric nitrous acid on alkaline snow surfaces. Geophysical Research Letters, American Geophysical Union, 2005, 32 (L10808), 1 à 4 p. ⟨10.1029/2005GL022589⟩. ⟨insu-00373750⟩



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