Abstract
The STEM-II pollutant transport/transformation/removal model has been enhanced to include scavenging by clouds and precipitation. The Advanced Scavenging Model (ASM) and Reactive Scavenging Model (RSM) have been coupled to STEM-II to enable comprehensive simulation and diagnosis analysis of field experiments designed to study acid deposition. In this paper, the STEM-II/ASM/RSM model is described. The coupled model is being used to analyze the PRECP-I field studies on an urban/suburban scale (Philadelphia), mesoscale (lower Ohio River Valley), and regional scale (eastern U.S.). The time period selected for detailed simulations and analysis is 29 April–5 May 1985. Subsequent papers will detail the results of these simulations.
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