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Project to Further Research, Develop, and Apply a New Air Pollution Modeling System

EPA Grant Number: R823186
Title: Project to Further Research, Develop, and Apply a New Air Pollution Modeling System
Investigators: Jacobson, Mark Z.
Institution: Stanford University
EPA Project Officer: Shapiro, Paul
Project Period: September 1, 1995 through August 31, 1998
Project Amount: $325,701
RFA: Exploratory Research - Chemistry and Physics of Air (1995)
Research Category: Engineering and Environmental Chemistry

Description:

The primary goal of the project is to improve treatment of chemical and physical processes in a numerical air pollution model. Specifically, treatment of aerosol and cloud processes needs the most attention. A second important goal is to apply and test the revised air pollution model in Los Angeles and the San Francisco Bay Area.

To accomplish the first goal, new algorithms will be developed. For example, a numerical algorithm that simulates transfer of gases to multiple sizes of aerosols and cloud drops will be produced. The algorithm treats both condensation of a gas onto particles and dissolution of a gas into particles. The transfer algorithm will be coupled to a chemical equilibrium solver, which calculates internal particle composition. To treat particles of different sizes in different grid cells of a model, a new particle size bin structure is being developed. In this structure, size bin edges are fixed but size bin centers are allowed to fluctuate. Thus, the structure is called the moving-bin structure.

To partly accomplish the second goal, simulations of air pollution in the Los Angeles Basin will be carried out. Simulations results will be compared to data from the Southern California Air Quality Study (SCAQS) period of August 26 - 29, 1987. Model predictions will be compared to data for aerosol, gas, radiative, and meteorological parameters. One objective will be to study peak daytime surface solar radiation, night time temperatures, and overall temperatures in the presence and absence of aerosols in Los Angeles.

Finally, simulations of pollution in the San Francisco Bay Area are being planned. Such simulations require improved treatment of cloud processes. To that end, different numerical cloud algorithms are being tested, and one will be implemented into the air pollution model.

Publications and Presentations:

Publications have been submitted on this project: View all 27 publications for this project

Journal Articles:

Journal Articles have been submitted on this project: View all 11 journal articles for this project

Supplemental Keywords:

air, ambient air, atmosphere, ozone, particulates, modeling, western, California, CA, Region 9 , Air, Geographic Area, Scientific Discipline, RFA, Engineering, Chemistry, & Physics, Physics, Chemistry, particulate matter, State, tropospheric ozone, aerosols, California (CA), chemical treatment, ozone, aerosol particles, cloud drop composition, surface solar radiation , environmental monitoring, particulates, chemical equilibrium solver, air modeling, air pollution models, air pollution modeling system, aerosol/ cloud interactions, atmospheric aerosol particles, ambient aerosol

Progress and Final Reports:
Final Report

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The perspectives, information and conclusions conveyed in research project abstracts, progress reports, final reports, journal abstracts and journal publications convey the viewpoints of the principal investigator and may not represent the views and policies of ORD and EPA. Conclusions drawn by the principal investigators have not been reviewed by the Agency.

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