HR: 1340h
AN: A23C-1489    [Abstracts]
TI: Aerosol Simulation in the Mexico City Metropolitan Area during MCMA2003 using CMAQ/Models3
AU: * Bei, N
EM: bnf@mce2.org
AF: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, USA, Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139,
AU: * Bei, N
EM: bnf@mce2.org
AF: Molina Center for Energy and the Environment, CA, USA, 3262 Holiday Court, La Jolla, CA 92037,
AU: Zavala, M
EM: miguelz@mit.edu
AF: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, USA, Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139,
AU: Zavala, M
EM: miguelz@mit.edu
AF: Molina Center for Energy and the Environment, CA, USA, 3262 Holiday Court, La Jolla, CA 92037,
AU: Lei, W
EM: wflei@mit.edu
AF: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, USA, Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139,
AU: Lei, W
EM: wflei@mit.edu
AF: Molina Center for Energy and the Environment, CA, USA, 3262 Holiday Court, La Jolla, CA 92037,
AU: de Foy, B
EM: foy@eas.slu.edu
AF: Molina Center for Energy and the Environment, CA, USA, 3262 Holiday Court, La Jolla, CA 92037,
AU: de Foy, B
EM: foy@eas.slu.edu
AF: Saint Louis University, Saint Louis, Missouri, USA, Saint Louis University, Saint Louis, MO 63108,
AU: Molina, L
EM: ltmolina@mit.edu
AF: Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, USA, Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139,
AU: Molina, L
EM: ltmolina@mit.edu
AF: Molina Center for Energy and the Environment, CA, USA, 3262 Holiday Court, La Jolla, CA 92037,
AB: CMAQ/Models3 has been employed to simulate the aerosol distribution and variation during the period from 13 to 16 April 2003 over the Mexico City Metropolitan Area as part of MCMA-2003 campaign. The meteorological fields are simulated using MM5, with three one-way nested grids with horizontal resolutions of 36, 12 and 3 km and 23 sigma levels in the vertical. MM5 3DVAR system has also been incorporated into the meteorological simulations. Chemical initial and boundary conditions are interpolated from the MOZART output. The SAPRC emission inventory is developed based on the official emission inventory for MCMA in 2004. The simulated mass concentrations of different aerosol compositions, such as elemental carbon (EC), primary organic aerosol (POA), secondary organic aerosol (SOA), nitrate, ammonium, and sulfate have been compared to the measurements taken at the National Center for Environmental Research and Training (Centro Nacional de Investigacion y Capacitacion Ambiental, CENICA) super-site. Hydrocarbon-like organic aerosol (HOA) and oxygenated organic aerosol (OOA) are used as observations of POA and SOA, respectively in this study. The preliminary model results show that the temporal evolutions of EC and POA are reasonable compared with measurements. The peak time of EC and POA are basically reproduced, thus validating the emission inventory and its processing through CMAQ/Models3. But the magnitude of EC and POA are underestimated over the entire episode. The modeled nitrate and ammonium concentrations are overestimated on most of the days. There is 1-2 hour difference between the simulated peak time of nitrate and ammonium aerosols compared to observations at CENICA. The simulated mass concentrations of SOA and sulfate are significantly underestimated. The reasons of the discrepancy between simulations and measurements are due to the uncertainties existing in the emission inventory, meteorological fields, and as well as aerosol formation mechanism in the case of SOA. The improvement in the emission invenory and aerosol formation mechanism are currently underway and will be presented.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0466 Modeling
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting