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Extramural Research

Grantee Research Project Results

Grantee Research Project Results

A Modeling Investigation of the Effects of Solid-Phase Cloud Hydrometeors in Convective Clouds on Chemical Distributions and Deposition

EPA Grant Number: U915641
Title: A Modeling Investigation of the Effects of Solid-Phase Cloud Hydrometeors in Convective Clouds on Chemical Distributions and Deposition
Investigators: Stuart, Amy L.
Institution: Stanford University
EPA Project Officer: Boddie, Georgette
Project Period: August 1, 1999 through August 31, 2002
Project Amount: $93,980
RFA: STAR Graduate Fellowships (1999)
Research Category: Academic Fellowships , Air Quality and Air Toxics , Fellowship - Atmospheric Sciences



The objective of this research project is to improve our understanding of the impacts of convective clouds on airborne chemical distributions and acid deposition, through a numerical modeling investigation of the effects of interactions of ice-phase hydrometeors.


Several representations of solid hydrometeor interactions into a three-dimensional cloud model will be implemented to systematically investigate the range of their potential impacts on chemistry. Data from field measurements, including the Stratospheric Tropospheric Experiment: Radiation, Aerosols, and Ozone, Part A, Deep Convection and the Chemical Composition of the Upper Troposphere and Lower Stratosphere (STERAO-A) field campaign, will be used for comparison and validation of modeling results.

The research will show that solid-phase processes lead to increased acid deposition, decreased transport of oxidized nitrogen species to the upper troposphere where they impact the chemistry of ozone, and increased rates of photolysis chemistry in the upper troposphere.

Supplemental Keywords:

air, air pollution, atmosphere, tropospheric, acid deposition, ozone, precipitation, chemical transport, environmental chemistry, modeling, cloud chemistry, RFA, Scientific Discipline, Air, Ecosystem Protection/Environmental Exposure & Risk, Air Pollutants, Monitoring/Modeling, Environmental Monitoring, Atmospheric Sciences, Ecology and Ecosystems, atmospheric dispersion models, atmospheric nitrogen, model-based analysis, 3 dimensional transport model, modeling, air quality model, troposphere, acid deposition, aerosols, atmospheric chemistry

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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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