HR: 17:36h
AN: A24A-08    [Abstracts]
TI: Impacts of Black Carbon Aerosols on Photochemistry in Megacities
AU: Li, G
EM: lgh@ariel.met.tamu.edu
AF: Department of Atmospheric Sciences, Texas A&M University, 1204 Eller O&M Building 3150 TAMU, College Station, TX 77843-3150 United States
AU: * Zhang, R
EM: zhang@ariel.met.tamu.edu
AF: Department of Atmospheric Sciences, Texas A&M University, 1204 Eller O&M Building 3150 TAMU, College Station, TX 77843-3150 United States
AU: Tie, X
EM: xxtie@ucar.edu
AF: ACD, NCAR, P.O. Box 3000, Boulder, CO 80307 United States
AB: The impacts of black carbon (BC) aerosols on photolysis frequencies and ozone formation are assessed using regional chemical transport models (CTMs). Regional distributions of BC aerosols are calculated and compared with measurements of fine particle matter (PM2.5); the simulated daily mean BC aerosols are in good agreement with observations in urban sites. BC aerosols decrease the photolysis frequencies in the boundary layer. The ground level J[O3(1d)] and J[NO2] are decreased, leading to a decrease in the ground level ozone concentrations. Results related to two urban centers (Houston and Mexico City) will be presented. Our study demonstrates that the impacts of BC aerosols are nonnegligible in decreasing photolysis frequencies and ozone in polluted urban areas.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting