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Acid dew and the role of chemistry in the dry deposition of reactive gases to wetted surfacesA formalism is developed to describe the dry deposition of soluble reactive gases to wetted surfaces in terms of the relevant meteorological conditions, the surface roughness, the total amount of liquid water present on the surface, the rate of accumulation of this water, and the species' solubility and reactivity in the surface water. This formulation is then incorporated into a model designed to simulate the generation of acidic dew from the deposition of HNO3, SO2, S(IV) oxidants, H2O2, and O3. Similar to the observations of dew in the continental U.S., the model generates a dewdrop pH of about 4 by the end of the night; the pH can rapidly fall to toxic levels due to rapid evaporation after sunrise. Relatively low deposition velocities are predicted for the SO2 and O3 because of their lower solubilities and hence larger surface resistances than those of the other oxidants. Because the chemical lifetime of the SO2 in the dew is influenced by the atmospheric levels of H2O2, O3, and SO2, the SO2 deposition velocity is a strong function of these species' atmospheric abundances.
Document ID
19880029957
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Chameides, William L.
(Georgia Institute of Technology Atlanta, United States)
Date Acquired
August 13, 2013
Publication Date
October 20, 1987
Publication Information
Publication: Journal of Geophysical Research
Volume: 92
ISSN: 0148-0227
Subject Category
Environment Pollution
Accession Number
88A17184
Funding Number(s)
CONTRACT_GRANT: NSF ATM-82-08828
CONTRACT_GRANT: NSF ATM-86-00888
CONTRACT_GRANT: NAG1-385
Distribution Limits
Public
Copyright
Other

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