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Solar spectral radiative forcing during the Southern African Regional Science Initiative
Earth Science Division, NASA Ames Research Center, Moffett Field, California, USA
Bay Area Environmental Research Institute, Sonoma, California, USA
Bay Area Environmental Research Institute, Sonoma, California, USA
Earth Science Division, NASA Ames Research Center, Moffett Field, California, USA
Bay Area Environmental Research Institute, Sonoma, California, USA
Bay Area Environmental Research Institute, Sonoma, California, USA
Bay Area Environmental Research Institute, Sonoma, California, USA
Department of Atmospheric Sciences, University of Washington, Seattle, Washington, USA
NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
During the dry season component of the Southern African Regional Science Initiative (SAFARI) in late winter 2000, the net solar spectral irradiance was measured at flight levels throughout biomass burning haze layers. From these measurements, the flux divergence, fractional absorption, instantaneous heating rate, and absorption efficiency were derived. Two cases are examined: on 24 August 2000 off the coast of Mozambique in the vicinity of Inhaca Island and on 6 September 2000 in a very thick continental haze layer over Mongu, Zambia. The measured absolute absorption was substantially higher for the case over Mongu where the measured midvisible optical depth exceeded unity. Instantaneous heating from aerosol absorption was 4 K d−1 over Mongu, Zambia and 1.5 K d−1 near Inhaca Island, Mozambique. However, the spectral absorption efficiency was nearly identical for both cases. Although the observations over Inhaca Island preceded the “river of smoke” from the southern African continent by nearly 2 weeks, the evidence here suggests a continental influence in the lower tropospheric aerosol far from source regions of burning.
Published 13 March 2003.
Citation: (2003), Solar spectral radiative forcing during the Southern African Regional Science Initiative, J. Geophys. Res., 108(D13), 8486, doi:10.1029/2002JD002411.
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