HR: 0800h
AN: A11A-0019    [Abstracts]
TI: Measurement of Mexico City Ultrafine Aerosol Size Distributions: Observations of New Particle Formation and Growth
AU: * Smith, J N
EM: jimsmith@ucar.edu
AF: National Center for Atmospheric Research, P. O. Box 3000, Boulder, CO 80307 United States
AU: Dunn, M J
AF: National Center for Atmospheric Research, P. O. Box 3000, Boulder, CO 80307 United States
AU: Dunn, M J
AF: Chemistry Department, University of Colorado, Boulder, CO 80309 United States
AU: Jim\'{e}nez, J
AF: Chemistry Department, University of Colorado, Boulder, CO 80309 United States
AU: Baumgardner, D
AF: Centro de Ciencias de la Atm\'{o}sfera, Universidad Nacional Aut\'{o}noma de M\'{e}xico, M\'{e}xico City, 04510 Mexico
AU: Castro, T
AF: Centro de Ciencias de la Atm\'{o}sfera, Universidad Nacional Aut\'{o}noma de M\'{e}xico, M\'{e}xico City, 04510 Mexico
AU: McMurry, P H
AF: Mechanical Engineering Department, University of Minnesota, Minneapolis, MN 55455 United States
AB: Continuous measurements of the size distribution of atmospheric aerosol in the 3 to 48 nm diameter range were performed in the Mexico City metropolitan area. These measurements were made during the period 10 to 20 April 2003 at a ground-based, mountain pass site in the southeast corner of the Mexico City Federal District and during the period 2 to 11 May 2003 at the CENICA site located near the city center. The objectives of this work were to determine the frequency of new particle formation and to characterize the atmospheric chemical and meteorological conditions that lead to these events. Several new particle formation events were recorded during the study. Events observed in the mountain pass correlate with northerly winds and elevated levels of sulfur dioxide in the mid-morning while events observed in the city correlate with elevated concentrations of sulfur dioxide and low particulate matter mass concentrations in the afternoon hours.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting