HR: 09:30h
AN: A51G-07    [Abstracts]
TI: Aerosol Transport Questions Arising From Micro Pulse Lidar Measurements During MILAGRO
AU: Kotamarthi, R
EM: vrkotamarthi@anl.gov
AF: Argonne National Laboratory, 9700 S. Cass Ave, Argonne, IL 60439,
AU: * Coulter, R
EM: rlcoulter@anl.gov
AF: Argonne National Laboratory, 9700 S. Cass Ave, Argonne, IL 60439,
AU: Pekour, M
EM: mikhail.pekour@pnl.gov
AF: Pacific Northwest National Laboratory, PO box 999, MS K9-30, Richlaand, WA 99352,
AB: A Micro Pulse Lidar (MPL) was operated by Argonne National Laboratory at the Universidad de Tecámac site (T1) during the MILAGRO field campaign in March 2006 in the environs of Mexico City. Located approximately 40 km north of the urban center of Mexico City, the T1 site was expected to observe the transport and evolution of aerosols as they moved out of the urban area on predominantly south winds. Because of the collocation of numerous other remote and in-situ sensors of aerosols, winds, temperatures and moisture. The MPL, operating at 0.527 microns, provides estimates of scattering in 15 m range (height) intervals, averaged over 10 sec between 200 m and (characteristically) 15 km, from which extinction profiles through and above the mixed layer can be calculated, mixed layer heights and evolution obtained and stratification and modification of aerosols observed. During the MILAGRO field campaign the growth of the mixed layer during daytime and the stratification of the atmosphere and subsequent aerosol layering were typical of previous campaigns and agreed well with structure observed by radar wind profiler, sodar, and radiosonde profiles. However, on many evenings very near sunset (1800 LT), a marked decrease in apparent aerosol concentration was observed through much of the depth of the mixed layer that persisted for 1-2 hours. Aerosol concentrations calculated with the CMAQ model coupled with MM5 wind fields will be evaluated with measured vertical profiles. Estimates of local radiative forcing for this site will be generated using MPL data set and model results.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0360 Radiation: transmission and scattering
DE: 0365 Troposphere: composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting