HR: 09:45h
AN: A51G-08    [Abstracts]
TI: Atmospheric Transport of Smoke and Dust Particulates and their interaction with the PBL as observed by multiwavelength Lidar, GOES and supporting instrumentation
AU: * Charles, L
EM: gross@ccny.cuny.edu
AF: City College of New york, 140th St and Convent Ave, New York, NY 10031, United States
AB: In this paper, we present results showing the usefulness of multiwavelength lidar measurements to study the interaction of aerosols in PBL with long range advected aerosol plumes. In particular, our measurements are used to determine the plume angstrom exponents, which allows us to differentiate smoke events from dust events as well as partitioning the total aerosol optical depth obtained from a CIMEL sky radiometer between the PBL and the high altitude plumes. Furthermore, we show that only if the optical depth from the upper level plumes is taken into account, the correlation between the lidar derived PBL aerosol optical depth and surface PM2.5 is high. In addition, we also observe the dynamic interaction of high altitude plumes interacting with the PBL resulting in a dramatic rise in surface PM10 concentrations without a corresponding dramatic rise in PM2.5 concentrations. These observations strongly suggest the deposition of large particulates into the PBL which is consistent with both lidar angstrom coefficient measurements and backtrajectory analysis. Finally, these measurements are coordinated with GOES AOD measurement data for the case of strong fire plumes. In particular, we show that GOES AOD data is very consistent with the radiometer data and clearly shows the onset of plumes over the NYC area. Furthermore, the cloud mask of GOES is shown to be to liberal and fooled by broken clouds. Modification of the mask is shown to improve performanxce of the GOES observations
DE: 0305 Aerosols and particles (0345, 4801, 4906)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting