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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 108, NO. D13,
8504,
doi:10.1029/2002JD002361,
2003
Vertical profiles of light scattering, light absorption, and single scattering albedo during the dry, biomass burning season
in southern Africa and comparisons of in situ and remote sensing measurements of aerosol optical depths
Brian I. Magi
Department of Atmospheric Sciences, University of Washington, Seattle, Washington, USA
Peter V. Hobbs
Department of Atmospheric Sciences, University of Washington, Seattle, Washington, USA
Beat Schmid
Bay Area Environmental Research Institute, Sonoma, California, USA
Jens Redemann
Bay Area Environmental Research Institute, Sonoma, California, USA
Abstract
Airborne in situ measurements of vertical profiles of aerosol light scattering, light absorption, and single scattering albedo
(ω0) are presented for a number of locations in southern Africa during the dry, biomass burning season. Features of the profiles
include haze layers, clean air slots, and marked decreases in light scattering in passing from the boundary layer into the
free troposphere. Frequency distributions of ω0 reflect the strong influence of smoke from biomass burning. For example, during a period when heavy smoke was advected into
the region from the north, the mean value of ω0 in the boundary layer was 0.81 ± 0.02 compared to 0.89 ± 0.03 prior to this intrusion. Comparisons of layer aerosol optical
depths derived from the in situ measurements with those measured by a Sun photometer aboard the aircraft show excellent agreement.
Received 22
March
2002;
accepted 8
July
2002;
published 19
June
2003.
Index Terms: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801); 0345 Atmospheric Composition and Structure: Pollution—urban and regional (0305); 3307 Meteorology and Atmospheric Dynamics: Boundary layer processes; 3359 Meteorology and Atmospheric Dynamics: Radiative processes.
Read Full Article (file size: 523714 bytes) Cited by
Citation: Magi, B. I., P. V. Hobbs, B. Schmid, and J. Redemann
(2003),
Vertical profiles of light scattering, light absorption, and single scattering albedo during the dry, biomass burning season
in southern Africa and comparisons of in situ and remote sensing measurements of aerosol optical depths,
J. Geophys. Res.,
108(D13),
8504,
doi:10.1029/2002JD002361.
Copyright 2003 by the American Geophysical Union.
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