Author(s)

S. Shiba & Y. Hirata

Abstract

For the purpose of investigating the effect of the drop-phase oxidation on acid rain formation by washout of gaseous pollutants, a mathematical model based on physico-chemical consideration has been constructed and the dynamics of the acidification has been simulated numerically with use of the model. The model deals with the below-cloud scavenging of the pollutant gases, considering such factors as: (1) the drop-phase chemistry; and (2) the mass transfer at the inter- face between the drop and the atmosphere. The results of the model simulation have disclosed that: (1) in the early stage of acidification bisulfate ion HSO^ is the major species to acidify the drop; and (2) with lapse of time SO^"" produced by the drop-phase oxidation increases gradually and eventually dominates the rai

Keywords