M. L. Wesely
Bldg. 203, ER
Argonne National Laboratory
Argonne, IL 60439
630-252-5827
fax 630-252-5498
mlwesely@anl.gov

P. V. Doskey and R. V. Kotamarthi
Argonne National Laboratory

This effort investigates the dry air-surface exchange of energy-related trace chemicals over North America and the surrounding oceanic areas through field measurements, theoretical studies, parameterization of exchange rates, and numerical modeling. Emphasis is on estimating the air-surface exchange rates of energy-related sulfur and nitrogen compounds, atmospheric oxidants, and selected organic gases with Argonne's air-surface exchange model. Field studies use micrometeorological techniques to measure air-surface exchange rates. Effective application of the resulting parameterizations requires highly detailed information on such surface conditions, which is inferred by use of remote sensing observations from satellites. Research on improved parameterization and modeling of processes is conducted in the following areas: (1) biogenic emissions of NO and reactive hydrocarbons, (2) temporal and spatial variations in soil moisture conditions and their effects on air-surface exchange, (3) dry deposition of a wide variety of organic gases, (4) rapid conversion of NO emitted from soils to NO₂ deposited on the surface from the atmospheric surface layer, (5) dry deposition to large bodies of water, and (6) deposition of submicron particles as a function of both chemical species and size. The focus of much of this work is on improving Argonne's dry air-surface exchange model for application in regional- and large-scale atmospheric chemistry numerical models. Modeling efforts and selected field experiments will be conducted in conjunction with ACP field campaigns on the behavior of oxidants and fine particles over regional scales.

Some further information on studies of (1) biogenic emissions and (2) effects of variations in soil moisture can be found in viewgraphs from recently given presentations. Some studies of the effects of isoprene emissions on tropospheric ozone formation above the eastern United States are described in the viewgraphs from a presentation at the Atmospheric Sciences Program Annual Meeting held in March 2002.