The STEM-II regional scale acid deposition and photochemical oxidant model-I. An overview of model development and applications

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. © 1991.