Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 6 8 2006 10.5194/acp-6-2321-2006 http://www.atmos-chem-phys.net/6/2321/2006/ http://www.atmos-chem-phys.net/6/2321/2006/acp-6-2321-2006.html http://www.atmos-chem-phys.net/6/2321/2006/acp-6-2321-2006.pdf 2321 2335 2006-06-21 Rapid ventilation of the Mexico City basin and regional fate of the urban plume B. de Foy bdefoy@mce2.org J. R. Varela L. T. Molina M. J. Molina Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, USA Departamento de Ingeniería de Procesos e Hidr\'aulica, Universidad Autónoma Metropolitana, Iztapalapa, Mexico current address: Molina Center for Energy and the Environment (mce2.org), California, USA Urban areas can be large emitters of air pollutants leading to negative health effects and environmental degradation. The rate of venting of these airsheds determines the pollutant loading for given emission levels, and also determines the regional impacts of the urban plume. Mexico City has approximately 20 million people living in a high altitude basin with air pollutant concentrations above the health limits most days of the year. A mesoscale meteorological model (MM5) and a particle trajectory model (FLEXPART) are used to simulate air flow within the Mexico City basin and the fate of the urban plume during the MCMA-2003 field campaign. The simulated trajectories are validated against pilot balloon and radiosonde trajectories. The residence time of air within the basin and the impacted areas are identified by episode type. Three specific cases are analysed to identify the meteorological processes involved. For most days, residence times in the basin are less than 12 h with little carry-over from day to day and little recirculation of air back into the basin. 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