Monday, 10 February 2003: 2:15 PM
A study of ozone concentration in the eastern United States with a dry deposition scheme using satellite data
Dry deposition of ozone is an important processes of its removal from the atmosphere. Most chemical transport models or photochemistry models use the traditional three-resistance model to simulate dry deposition. The treatment of resistance to uptake by plant stomata, which can be the major pathway for surface uptake of ozone, varies considerably among the models. In this study, a dry deposition scheme was applied in which the bulk canopy stomatal resistance is estimated with data on optical reflectances remotely sensed from satellites. This approach was implemented in the photochemistry model of CAMx (the Comprehensive Air Quality Model with extension) to replace the "RADM" dry deposition scheme in treatment of stomatal resistance. Ozone concentration was simulated over the eastern United States for an Ozone Transport Assessment Group case in July 1995, to study the diurnal variations and area distribution of peak ozone concentration. Some comparisons with previous results were made for the ozone sensitivity studies.