HR: 1340h
AN: A23C-1478    [Abstracts]
TI: What does the future hold for Mexico City? Trends of emissions from mobile sources in the MCMA
AU: * Zavala, M
EM: miguelz@mit.edu
AF: Massachussetts Institute of Technology, 77 Mass. Av., Cambridge, MA 02139, United States
AU: * Zavala, M
EM: miguelz@mit.edu
AF: Molina Center for Energy and the Environment, 3262 Holiday Court, La Jolla, CA 92037, United States
AU: Herndon, S
AF: Aerodyne Research Inc, 45 Manning Road, Billerica, MA 01821, United States
AU: Wood, E
EM: Ezrawood@aerodyne.com
AF: Aerodyne Research Inc, 45 Manning Road, Billerica, MA 01821, United States
AU: Onasch, T
EM: onasch@aerodyne.com
AF: Aerodyne Research Inc, 45 Manning Road, Billerica, MA 01821, United States
AU: Knighton, B
EM: bknighton@chemistry.montana.edu
AF: Montana State University, Montana State University P.O. Box 172260, Bozeman, MT 59717, United States
AU: Molina, M J
EM: mjmolina@ucsd.edu
AF: University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093, United States
AU: Kolb, C
EM: kolb@aerodyne.com
AF: Aerodyne Research Inc, 45 Manning Road, Billerica, MA 01821, United States
AU: Molina, L T
EM: ltmolina@mit.edu
AF: Massachussetts Institute of Technology, 77 Mass. Av., Cambridge, MA 02139, United States
AU: Molina, L T
EM: ltmolina@mit.edu
AF: Molina Center for Energy and the Environment, 3262 Holiday Court, La Jolla, CA 92037, United States
AB: Mobile emission sources represent a significant fraction of the total anthropogenic emissions burden in megacities and have a deleterious effect on air quality at multiple spatial scales. There are, however, large uncertainties involved during the estimation of mobile emissions inventories. During the 2002/2003 MCMA and the 2006 MILAGRO field campaigns in the Mexico City Metropolitan Area (MCMA), the Aerodyne Research Inc. (ARI) Mobile Laboratory characterized on-road vehicle fleet emission indices in fleet-average mode for various vehicle classes and driving speeds using fast-response instrumentation. In 2006 the ARI mobile laboratory was also deployed in various sites across the MCMA for characterizing gases and aerosols using research grade real-time trace gas and fine particulate matter (PM) instruments. In addition to the fixed site measurements, the fast response instrumentation was also used during the transit of the mobile lab between these sites to obtain on-road vehicle emissions data in fleet-average mode. In this work, we present the measurements of emission indices in fleet-average mode taken during the MILAGRO field campaign. Measurements of NOx, CO, key VOC species and particle mass (PM1) and composition from mobile sources in the MCMA are used to validate the official Emissions Inventory. We compare on-road emission measurements from the 2002, 2003 and 2006 field campaigns and other available emission measurement studies. Given the profound changes in the composition of the vehicle fleet in Mexico City over the past two decades, the comparison provides valuable information on the present and future emission trends in the urban area.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0478 Pollution: urban, regional and global (0345, 4251)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting