HR: 0800h
AN: A11A-0031    [Abstracts]
TI: Impacts of Aerosols on UV Radiation and Ozone Formation and Analysis of Chemical Processes using a 3-D Chemical Transport Model in the Mexico City Metropolitan Area
AU: * Lei, W
EM: wflei@mit.edu
AF: Departments of Earth, Atmospheric and Planetary Sciences and of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139 United States
AU: de Foy, B
AF: Departments of Earth, Atmospheric and Planetary Sciences and of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139 United States
AU: Volkamer, R
AF: Departments of Earth, Atmospheric and Planetary Sciences and of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139 United States
AU: Frey, S
AF: Departments of Earth, Atmospheric and Planetary Sciences and of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139 United States
AU: Molina, L T
AF: Departments of Earth, Atmospheric and Planetary Sciences and of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139 United States
AU: Molina, M J
AF: Departments of Earth, Atmospheric and Planetary Sciences and of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139 United States
AB: The influence of aerosols on UV radiation is investigated by calculating the photolysis rate coefficients using the NCAR tropospheric ultraviolet and visible radiation model (TUV) constrained by aerosol extinction vertical profiles as well as other optical properties provided by Lidar and spectroradiometer observations. The calculated photolysis rates are validated by measured values for key species. The computed photolysis rates are incorporated into a 3-D chemical transport model CAMx (Environ) to assess the impacts of aerosols on O3 formation in the Mexico City Metropolitan Area. Understanding the chemical processes governing O3 formation and the sensitivity of O3 to emissions reductions is a key issue in formulating an effective O3 control strategy . We performed episodic simulations using the CAMx model and analyzed the chemical processes in terms of the budgets of free radicals, NOy and O3, and O3 production rate and efficiency, which gave us useful information about important chemical processes controlling O3 production and sensitivity to precursor reductions. We analyzed as well the effects of chemistry, transport and deposition on O3 production in Mexico City.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
DE: 0355 Thermosphere--composition and chemistry
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting