HR: 1340h
AN: A23C-1471    [Abstracts]
TI: Eddy Covariance Flux Measurements of Urban Aerosols During the MILAGRO Mexico City Field Campaign
AU: * Grivicke, R
EM: rgrivicke@mail.wsu.edu
AF: Washington State University, Dept of Civil & Environmental Engineering, Pullman, WA 99164-2910, United States
AU: Pressley, S
EM: spressle@wsu.edu
AF: Washington State University, Dept of Civil & Environmental Engineering, Pullman, WA 99164-2910, United States
AU: Jimenez, J
EM: jose.jimenez@colorado.edu
AF: Dept. of Chemistry & CIRES, University of Colorado, Boulder, CO 80309, United States
AU: Nemitz, E
EM: en@ceh.ac.uk
AF: Centre for Ecology and Hydrology, Penicuik, Midlothian, EH26 0QB, United Kingdom
AU: Alexander, L
EM: lizabeth.alexander@pnl.gov
AF: Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, United States
AU: Velasco, E
EM: evalasco@mce2.org
AF: Molina Center for Energy and the Environment, La Jolla, La Jolla, CA 92037, United States
AU: Allwine, E
EM: allwineg@wsu.edu
AF: Washington State University, Dept of Civil & Environmental Engineering, Pullman, WA 99164-2910, United States
AU: Jobson, T
EM: tjobson@wsu.edu
AF: Washington State University, Dept of Civil & Environmental Engineering, Pullman, WA 99164-2910, United States
AU: Westberg, H
EM: westberg@mail.wsu.edu
AF: Washington State University, Dept of Civil & Environmental Engineering, Pullman, WA 99164-2910, United States
AU: Ramos, R
EM: rramos@clintonfoundation.org
AF: Sistema de Monitorea Atmosferico de la Ciudad de Mexico, D.F., Mexico City, D.F 11800, Mexico
AU: Molina, L
EM: ltmolina@mit.edu
AF: Molina Center for Energy and the Environment, La Jolla, La Jolla, CA 92037, United States
AU: Lamb, B
EM: blamb@wsu.edu
AF: Washington State University, Dept of Civil & Environmental Engineering, Pullman, WA 99164-2910, United States
AB: Expansive urban development in the fast growing number of megacities around the world raises concerns regarding the pollution levels in such sites. The Mexico City MILAGRO 2006 (Megacity Initiative: Local and Global Research Observations) field campaign was a worldwide initiative aiming to understand sources, chemical nature and evolution of pollution in one of the largest urban developments. As part of the MILAGRO campaign, urban fluxes of aerosols and related trace gases were measured near the centre of Mexico City at 42 m above street level. Aerosol concentrations (1 min. averages) and aerosol fluxes (10 Hz, selected ion monitoring) were measured with an Aerodyne quadrupole aerosol mass spectrometer operated in an alternating 30 minute mode of ambient concentrations and fluxes. The fluxes were derived using eddy covariance calculations. The aerosol flux data were supported by additional flux measurements of CO2 and a number of gas phase VOC species using a combination of techniques, including Proton Transfer Reaction Mass Spectrometry using a disjunct eddy covariance technique and GC-FID analysis of samples from a disjunct eddy accumulation sampler. Preliminary results of aerosol concentrations and flux measurements indicate that the urban landscape is a significant source of organic aerosols.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting