HR: 1400h
AN: A43A-02    [Abstracts]
TI: WRF/Chem Analyses and Comparisons with In Situ, Aircraft and Satellite Data during MILAGRO
AU: Zhang, Y
EM: yongxin@lanl.gov
AF: Los Alamos National Laboratory, MSD462, LANL, Los Alamos, NM 87545, United States
AU: * Dubey, M K
EM: dubey@lanl.gov
AF: Los Alamos National Laboratory, MSD462, LANL, Los Alamos, NM 87545, United States
AU: Zavala, M A
EM: miguelz@MIT.EDU
AF: MIT and Molina Center for Energy & Environment, 3262 Holiday Ct. Suite 201, La Jolla, CA 92037, United States
AU: Olsen, S
EM: solsen@lanl.gov
AF: Los Alamos National Laboratory, MSD462, LANL, Los Alamos, NM 87545, United States
AU: Molina, L T
EM: ltmolina@mit.edu
AF: MIT and Molina Center for Energy & Environment, 3262 Holiday Ct. Suite 201, La Jolla, CA 92037, United States
AU: de Foy, B
EM: foy@eas.slu.edu
AF: Saint Louis University, Earth & Atmospheric Sciences 205 O'Neil Hall, 3642 Lindell Blvd, St. Louis, MO 63108, United States
AB: During March 2006, the Megacity Initiative: Local and Global Research Observations (MILAGRO) field campaign was conducted over the Mexico City area in collaboration with several national and international institutions and agencies. Coordinated aircraft-based and ground-based measurements for gaseous pollutants (CO, O₃, NOx, SO₂ etc.) and aerosol particles (PM2.5, PM10) were made during MILAGRO supported by extensive satellite observations and modeling activities at various scales. The goal of this study is to examine and compare fully coupled WRF/Chem (Weather Research and Forecasting - Chemistry) model simulations at 3-km resolution with in situ, aircraft and satellite data during MILAGRO. Emissions input data compiled by the Molina Center for Energy and the Environment (MCE2) based on the official emissions inventory for Mexico City in 2004 are used for this study. The emissions rates in this inventory are regarded as representative for typical weekdays in Mexico City. For Saturday and Sunday, the emissions data are obtained by scaling the total emissions rates by 85% and 75%, respectively. For holidays, the emissions data are obtained by scaling the total emissions rates by 90%. Preliminary analyses suggest that the model simulations for gaseous species on weekdays agree reasonably well with observations in terms of pollutant concentrations and diurnal cycles. On weekends and holidays, appreciable discrepancies are noted between the model simulations and the observations, likely reflecting uncertainties in the emissions rates for weekends and holidays. Work is underway to employ the MCE2's newly constructed aerosols emissions data to validate the WRF/Chem simulated aerosol particles and to examine the transport and transformation of aerosols on local and regional scales. In this study, we will also discuss emissions control strategies for alleviating pollution problems in Mexico City based on model sensitivity results.
UR: http:aerosols.lanl.gov
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 1225 Global change from geodesy (1222, 1622, 1630, 1641, 1645, 4556)
DE: 1610 Atmosphere (0315, 0325)
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly