Aerosol optical depth retrieval using ATSR-2 and AVHRR data during TARFOX
Author
Veefkind, J. Pepijn
de Leeuw, Gerrit
Durkee, Philip A.
Russell, Philip B.
Hobbs, Peter V.
Livingston, John M.
Date
1999-01-27Metadata
Show full item recordAbstract
Satellite retrieved aerosol optical properties are compared to aircraft
measurements for a case study during the Tropospheric Aerosol Radiative Forcing
Observational Experiment (TARFOX). Two satellite instruments are used: the
Along Track Scanning Radiometer 2 (ATSR-2) and the advanced very high
resolution radiometer (AVHRR). The aerosol optical depth in the mid-visible
(0.555 Jjm) retrieved from the ATSR-2 data agrees within 0.03 with colocated
sunphotometer measurements. Also, the spectral behavior of the aerosol optical
depth is retrieved accurately. Good correlation is found between aerosol optical
depths for AVHRR channel 1 (0.64 Jjm) and sunphotometer derived values, but
the satellite retrieved values are 0.05 to 0.15 lower. The Angstrom wavelength
exponent is determined both from the ATSR-2 and the AVHRR data. The ATSR-2
derived Angstrom exponents are in good agreement with the values computed from
the sunphotometer data. The Angstrom exponents determined from AVHRR data
show very large variations. Both the ATSR-2 and the AVHRR aerosol optical
depth images show a large gradient. Vertical profile data of temperature, relative
humidity, and particle scattering indicate that this gradient is probably caused by
changes in the dry aerosol properties, rather than a change in the relative humidity.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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