HR: 09:30h
AN: A41F-06    [Abstracts]
TI: Assessing the regional impact of Mexico City on air quality
AU: * Mena-Carrasco, M A
EM: mmena@unab.cl
AF: Universidad Nacional Andres Bello, Republica 440, Santiago, RM RM, Chile
AU: Carmichael, G R
EM: gcarmich@engineering.uiowa.edu
AF: The Center for Global and Regional Environmental Research, 427 IATL, Iowa City, IA 52242, United States
AU: Molina, L T
EM: ltmolina@mit.edu
AF: Molina Center for Energy and Environment, 3262 Holiday Ct. Suite 201, La Jolla, CA 92037, United States
AU: Campbell, J E
EM: campbell@stanford.edu
AF: Stanford University, Department of Global Ecology Carnegie Institution of Washington 260 Panama Street, Stanford, CA 94305, United States
AU: Adhikary, B
EM: badhikar@engineering.uiowa.edu
AF: The Center for Global and Regional Environmental Research, 427 IATL, Iowa City, IA 52242, United States
AB: This research analyzes the effect of Mexico City emissions on air quality, photochemistry, and ozone production efficiencies. Model sensitivity studies suggest that Mexico City emissions can contribute to 20-30 percent of NO₂ two degrees North of the city, but at higher altitudes this can contribute to 4-8 percent of NO₂ into the Gulf of Mexico. This research provides evidence of long range transport of Mexico City emissions off the coast of Texas using a combination of aircraft observations and model products for a March 19, 2006 C-130 flight. Observations were interpolated by kriging, showing significant enhancements of O3 and NOy collocated with enhancements of MTBE, a tracer for mobile source emissions. Sensitivity studies and source tag tracer model products suggest large contribution of Mexico City emissions to those samples. The simulated effect of MC aerosol emissions on photochemistry showed a regional decrease of 40 percent in J[NO₂ to NO+O^.], and ozone production by 5-10 percent. Interpolation of model error of NO₂ photolysis rates show these estimates may be conservative. This paper will explore the interactions between aerosol loadings in relationship to ozone production efficiency using C-130, DC-8, and G-1 data.
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0545 Modeling (4255)
DE: 3355 Regional modeling
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting