HR: 08:30h
AN: A21E-03    [Abstracts]
TI: Aerosol Properties From Multi-angle Satellite Imaging
AU: * Kahn, R A
EM: ralph.kahn@jpl.nasa.gov
AF: Jet Propulsion Lab/Caltech, MS169-237 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Martonchik, J V
EM: jvm@jord.jpl.nasa.gov
AF: Jet Propulsion Lab/Caltech, MS169-237 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Diner, D J
EM: djd@jord.jpl.nasa.gov
AF: Jet Propulsion Lab/Caltech, MS169-237 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Chen, W A
EM: annechen@caltech.edu
AF: Department of Environmental Science & Engineering, California Institute of Technology 210-41, Pasadena, CA 91125 United States
AU: Gaitley, B J
EM: bjg@jord.jpl.nasa.gov
AF: Jet Propulsion Lab/Caltech, MS169-237 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Kalashnikova, O V
EM: olgak@jord.jpl.nasa.gov
AF: Jet Propulsion Lab/Caltech, MS169-237 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Liu, Y
EM: yliu@deas.harvard.edu
AF: Division of Engineering and Applied Sciences, Harvard Graduate School of Arts & Sciences 29 Oxford Street, Cambridge, MA 02138 United States
AU: Team, T
EM: ralph.kahn@jpl.nasa.gov
AF: Jet Propulsion Lab/Caltech, MS169-237 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AB: Based on pre-launch simulations, we expected that data from the multi-angle, multi-spectral MISR instrument aboard NASA's Terra satellite would contain, in addition to aerosol optical depth (AOT), information about particle size, shape, and single-scattering albedo (SSA). Such information would add a great deal to the global aerosol picture that satellites provide, allowing more meaningful assessments of aerosol direct radiative impact, source attribution, material fluxes, and possibly indirect effects of aerosols on clouds. But particle micro-physical property retrievals are much more difficult to validate than AOT, since there are significant uncertainties in aerosol size, and especially shape and SSA, retrieved from surface-based sun photometers, whereas instrumented aircraft must fly complex patterns to adequately sample all aerosol layers in the entire column seen simultaneously by MISR. Our multi-faceted validation effort, which makes use of ground-based AERONET sun photometers as well as coincident satellite and intensive field observations, has allowed us to quantify MISR data sensitivity to these aerosol micro-physical properties over dark water, and in a few situations, over land. In broad terms, over dark water MISR can distinguish three-to-five aerosol size bins between about 0.1 and 2.5 microns effective diameter, spherical vs. non-spherical particle shapes, plates from grains from spheroids at least in some cases, and two-to-four SSA groupings between 0.75 and 1.0. MISR can also identify several aerosol modes within the column, provided each contributes more than about 20% to the total column mid-visible AOT. These sensitivities diminish for column AOT below about 0.15, and for brighter underlying surfaces. This talk will summarize the current status of the MISR Standard Aerosol Product, the latest MISR Research Aerosol Retrieval validation study results, and our plans for completing aerosol micro-physical property formal validation for the MISR Standard Aerosol Product. This work is performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
UR: http://www-misr.jpl.nasa.gov
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005