HR: 09:00h
AN: A21E-05    [Abstracts]
TI: 24-year AVHRR-derived Climatology Of Aerosol Optical Thickness And Size
AU: * Geogdzhayev, I
EM: igor@giss.nasa.gov
AF: Columbia University/NASA GISS, 2880 Broadway, New York, NY 10025 United States
AU: Mishchenko, M
EM: mmishchenko@giss.nasa.gov
AF: NASA Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025 United States
AB: Aerosol influence on climate is currently the subject of intense research by both modeling and remote sensing scientific communities. Advanced instruments such as MODerate resolution Imaging Spectrometer (MODIS) and Multiangle Imaging Spectro-Radiometer (MISR) provide the best currently available global data on aerosol amount size and composition. However the longest aerosol records important for climate studies are derived from the instruments not originally designed for aerosol research such as Advanced Very High Resolution Radiometer (AVHRR) and Total Ozone Mapping Spectrometer (TOMS). Global Aerosol Climatology Project dataset is one of the longest continuous global dataset of aerosol amount and Angstrom exponent. Here we present an extension of this product covering the period from August 1981 to the end of 2004. It covers two major volcanic eruptions (El Chichon and Pinatubo) as well as a number of dust and biomass burning events of regional importance. We discuss global and regional features of the aerosol optical thickness and Angstrom exponent over ocean. We performed an in-depth comparison of AVHRR, MISR, MODIS/Terra and MODIS/Aqua aerosol retrievals for the period when contemporaneous data are available. By performing analysis for areas predominantly affected by different types of aerosol such as clear maritime, dust etc. we analyze the performance of AVHRR retrieval algorithm and the adequacy of the microphysical model. The comparison provides a bridge between the historical AVHRR record and the data from the new advanced instruments thus helping to understand the limitaions of the former and increasing the value of the later.
UR: http://gacp.giss.nasa.gov
DE: 1610 Atmosphere (0315, 0325)
DE: 3311 Clouds and aerosols
DE: 3360 Remote sensing
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005