HR: 1340h
AN: A33A-0859    [Abstracts]
TI: The Microphysical and Chemical properties of aerosol particles from the United Arab Emirates Unified Aerosol Experiment (UAE2) and from the Bodele-BODEX Experiment
AU: * Martins, J
EM: martins@climate.gsfc.nasa.gov
AF: Joint Center for Earth Systems Technology, UMBC, code 613.2, NASA Goddard Space Flight Center, Greenbelt, MD 20770 United States
AU: * Martins, J
EM: martins@climate.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, code 613.2, Greenbelt, MD 20771 United States
AU: * Martins, J
EM: martins@climate.gsfc.nasa.gov
AF: Institute of Physics, University of Sao Paulo, Rua do Matao, 187, Sao Paulo, SP 05508 Brazil
AU: Chaudhry, Z
EM: zahra@atmos.umd.edu
AF: University of Maryland College Park, Department of Meteorology, College Park, MD 20742 United States
AU: Todd, M
EM: m.todd@geog.ucl.ac.uk
AF: Department of Geography, University College London, 26 Bedford Way, London, WC1 8HR United Kingdom
AU: Kaufman, Y
EM: kaufman@climate.gsfc.nasa.gov
AF: NASA Goddard Space Flight Center, code 613.2, Greenbelt, MD 20771 United States
AU: Artaxo, P
EM: artaxo@if.usp.br
AF: Institute of Physics, University of Sao Paulo, Rua do Matao, 187, Sao Paulo, SP 05508 Brazil
AB: Aerosol filters collected during the UAE2 experiment (August 2004), and during the BODEX experiment (in the Bodele region, February 2005) were analyzed for spectral absorption properties (from 350-2500nm), mass concentration (fine and coarse modes), electron microscopy, and chemical composition. The UAE2 samples show evidence of absorption by dust and urban pollution particles. In the fine mode, the urban pollution particles show spectral dependence inversely proportional to the wavelength, which is compatible with small black carbon aerosols. The coarse mode shows evidences of the internal mixture between dust and pollution, producing the typical strong absorption in UV-Visible wavelengths produced by dust, as well as significant absorption in the NIR (near infrared) coming from the dust-pollution combination. On the other hand, the Bodele samples show at least two types of dust absorption behavior: 1 - very strong absorption efficiency in the UV and visible wavelengths with nearly no absorption in the NIR; 2 - very strong absorption efficiency in the UV-VIS region with significant absorption in the NIR. Additional samples collected in the Amazon region, in Brazil, show evidence of long-range transport of dust from the Sahara. The chemical composition and microphysical properties of the Amazon Samples are compared with those measured in the UAE and Bodele regions. The chemical composition of these samples provides additional insight on previous theories of the fertilization of the Amazon by long-range transport of dust from the Sahara region.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0330 Geochemical cycles (1030)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0360 Radiation: transmission and scattering
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005