The Direct Radiative Forcing of Biomass Burning Aerosols: Investigations during SCAR-B and ZIBBEE
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2000
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
Using the NOAA-14 1-km Advanced Very High Resolution Radiometer
(AVHRR) and the Geostationary Operational Environmental Satellite (GOES-8) imager
data, smoke aerosol optical thickness (τ) is retrieved over land during the Smoke, Clouds
and Radiation-Brazil (SCAR-B) experiment in Brazil during August-September 1995.
The satellite-retrieved τ values are then compared against ground-based sunphotometer
derived τ values from the Aerosol Robotic Network (AERONET) program. Both the
AVHRR and GOES 8 retrieved τ values are in excellent agreement with the AERONET
derived τ values with linear correlation coefficients of 0.93. A single scattering albedo of
0.90 (at 0.67 µm) provides the best fit between the measured and retrieved values. The
sensitivity of the retrieved τ to assumed surface albedo and aerosol single scattering
albedo are also examined. A simple thresholding algorithm is used to separate smoke
from other features over land from GOES-8 satellite imagery and regional maps of τ are
provided. Our results show that the aerosol properties used in this paper are adequate to
characterize biomass-burning aerosols and can be used in studies that model the role of
biomass burning on regional climate.