Abstract
Monitoring programs conducted over the northeastern continental USA during the past few years have indicated that sulfate particles present in air near the surface are often acidic. These particles, which are typically small and hygroscopic, might be expected to attach themselves to foliage, thus imparting a strong but very localized dose of acid. At this time, the efficiency with which small particles attach themselves to leaf surfaces and the conditions under which they might be re-emitted by abrasion, for example, are largely unknown, and so a considerable uncertainty must be associated with any evaluation of the net effect. Application of deposition velocities in the range presently advocated for sulfate particles suggests acid fluxes by dry deposition that average about two orders of magnitude less than those probably resulting from rainfall. This should not be interpreted as an indication that dry deposition effects can be neglected, since it is clear that acid particles might reside on surfaces for considerable times, perhaps until washed off by rain or sufficiently diluted by dewfall.
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Hicks, B.B. (1980). On the Dry Deposition of Acid Particles to Natural Surfaces. In: Toribara, T.Y., Miller, M.W., Morrow, P.E. (eds) Polluted Rain. Environmental Science Research. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3060-8_17
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DOI: https://doi.org/10.1007/978-1-4613-3060-8_17
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