MODELING DRY DEPOSITION OF SO2

Citation
Jw. Erisman et D. Baldocchi, MODELING DRY DEPOSITION OF SO2, Tellus. Series B, Chemical and physical meteorology, 46(3), 1994, pp. 159-1171
Citations number
NO
Categorie Soggetti
Metereology & Atmospheric Sciences
ISSN journal
02806509
Volume
46
Issue
3
Year of publication
1994
Pages
159 - 1171
Database
ISI
SICI code
0280-6509(1994)46:3<159:MDDOS>2.0.ZU;2-M
Abstract
The goals of this paper are to briefly describe experimental methods t hat are used to measure SO2 dry deposition, and to discuss the physica l, biological and chemical processes that control SO2 deposition fluxe s over vegetation and to describe how these fluxes are modelled. The p redominant pathway for gaseous SO2 uptake to dry vegetation is via tur bulent transfer through the atmosphere surface boundary layer and mole cular diffusion through the leaf laminar boundary layer and the stomat a. The soil surface is a significant, but weaker sink for sulphur, esp ecially when frozen or covered with snow. The appreciable solubility o f SO2 causes its uptake to be enhanced greatly in the presence of mois ture on leaves and the soil. The aqueous uptake of SO2, however, cause s the pH of a solution to decrease which in turn produces a reduction in the solubility of SO2. Neutralising species (ammonia, inner plant s pecies) may cancel this reduction. A method is proposed to estimate lo cal scale dry deposition fluxes of SO2 in Europe. The method combines long-range transport modelling results, land use and surface specific data and an inferential approach.