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Direct Observations of Excess Solar Absorption by Clouds

Aircraft measurements of solar flux in the cloudy tropical atmosphere reveal that solar absorption by clouds is anomalously large when compared to theoretical estimates. The ratio of cloud forcing at an altitude of 20 kilometers to that at the surface is 1.58 rather than 1.0, as predicted by models....

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Published in:	Science (American Association for the Advancement of Science) 1995-03, Vol.267 (5204), p.1626-1629
Main Authors:	Pilewskie, Peter, Francisco P. J. Valero
Format:	Article
Language:	English
Subjects:	Aircraft Albedo Altitude Atmospherics Clouds Clouds (Meteorology) Earth, ocean, space Environmental aspects Exact sciences and technology External geophysics Flight altitude Geographic regions Meteorology Radiative transfer. Solar radiation Solar flux Solar radiation Sorption Space flight Water in the atmosphere (humidity, clouds, evaporation, precipitation)
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description	Aircraft measurements of solar flux in the cloudy tropical atmosphere reveal that solar absorption by clouds is anomalously large when compared to theoretical estimates. The ratio of cloud forcing at an altitude of 20 kilometers to that at the surface is 1.58 rather than 1.0, as predicted by models. These results were derived from a cloud radiation experiment in which identical instrumentation was deployed on coordinated stacked aircraft. These findings indicate a significant difference between measurements and theory and imply that the interaction between clouds and solar radiation is poorly understood.
doi_str_mv	10.1126/science.267.5204.1626
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subjects	Aircraft Albedo Altitude Atmospherics Clouds Clouds (Meteorology) Earth, ocean, space Environmental aspects Exact sciences and technology External geophysics Flight altitude Geographic regions Meteorology Radiative transfer. Solar radiation Solar flux Solar radiation Sorption Space flight Water in the atmosphere (humidity, clouds, evaporation, precipitation)
title	Direct Observations of Excess Solar Absorption by Clouds
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