HR: 09:18h
AN: A31E-06    [Abstracts]
TI: NOy partitioning and the role of alkyl nitrates in Tecamac, Mexico
AU: * Farmer, D K
EM: delphine.farmer@colorado.edu
AF: Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado, Boulder, CO 80309, United States
AU: * Farmer, D K
EM: delphine.farmer@colorado.edu
AF: Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, United States
AU: Perring, A E
EM: aperring@berkeley.edu
AF: Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, United States
AU: Wooldridge, P J
EM: pjwool@berkeley.edu
AF: Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, United States
AU: Cohen, R C
EM: cohen@cchem.berkeley.edu
AF: Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, United States
AU: Cohen, R C
EM: cohen@cchem.berkeley.edu
AF: Department of Earth and Planetary Science, University of California at Berkeley, Berkeley, CA 94720, United States
AU: Cohen, R C
EM: cohen@cchem.berkeley.edu
AF: Environmental Technologies Division, Lawrence Berkeley National Labs, Berkeley, CA 94720, United States
AU: Huey, L G
EM: greg.huey@eas.gatech.edu
AF: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States
AU: Sjostedt, S
EM: sjosted67@yahoo.com
AF: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States
AU: Tanner, D
EM: tanner@eas.gatech.edu
AF: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States
AU: Vargas, O
AF: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, United States
AU: deGuow, J
AF: Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO 80305, United States
AU: Warneke, C
EM: Carsten.Warneke@noaa.gov
AF: Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO 80305, United States
AU: Kuster, W C
EM: William.C.Kuster@noaa.gov
AF: Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO 80305, United States
AU: Blake, D
EM: drblake@uci.edu
AF: Department of Earth System Science, University of California at Irvine, Irvine, CA 92697, United States
AU: Baker, A
EM: akyoung@uci.edu
AF: Department of Earth System Science, University of California at Irvine, Irvine, CA 92697, United States
AB: The reactive nitrogen oxide (NOy) budget observed at the T1 site in Tecamac, MX during the MILAGRO campaign in March 2006 allows us to probe the role of alkyl nitrates (ANs) and peroxy nitrates (PNs) in a polluted megacity region. Comparing data from the Mexico City region to previous field sites at Granite Bay, California and Houston, Texas demonstrate that each site has a characteristic nitric acid and alkyl nitrate production efficiency depending on the balance of NOx and VOCs. This balance in turn affects the ozone production efficiency. Unlike Granite Bay and Houston, little isoprene was observed at Tecamac: the result is an alkyl nitrate (AN) population with a higher observed branching ratio (~7 %). The observed branching ratio is consistent with predictions based on the VOC distribution and predicted OH reactivity at the site. These predictions suggest that aromatics and multifunctional ANs such as hydroxyalkyl nitrates make up a large fraction of ANs in the Mexico City plume, and have implications to ozone production and air quality in the region.
DE: 0317 Chemical kinetic and photochemical properties
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting