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Proceedings Paper

Cloud microphysical properties from multispectral reflectance measurements
Author(s): Michael D. King; Teruyuki Nakajima; James D. Spinhirne; Lawrence F. Radke
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Paper Abstract

A multispectral scanning radiometer has been used to obtain measurements of the reflection function of marine stratocumulus clouds at 0. 75 1 . 65 and 2. 1 6 rim. These observations were obtained from the NASA ER-2 aircraft as part of the First ISCCP [International Satellite Cloud Climatology Project] Regional Experiment (FIRE) conducted off the coast of southern California during July 1987. Multispectral images of the reflection function were used to derive the optical thickness and effective particle radius of stratiform cloud layers on four days. In addition to the radiation measurements in situ microphysical measurements were obtained from the University of Washington Convair C-131A aircraft. In this paper we compare remote sensing results with in situ observations which show a good spatial correlation for both optical thickness and effective radius. These comparisons further show systematic differences between remote sensing and in situ values with a tendency for remote sensing to overestimate the effective radius by 23 pm independent of particle radius. The optical thickness in contrast is somewhat overestimated for small optical thicknesses and underestimated for large optical thicknesses. Marginal probability density functions of optical thickness and effective radius have been derived from our remote sensing results. The joint probability density function of optical thickness and effective radius shows that the effective radius increases as the optical thickness increases for optically thin clouds in contrast to optically thick clouds for

Paper Details

Date Published: 1 September 1990
PDF: 15 pages
Proc. SPIE 1299, Long-Term Monitoring of the Earth's Radiation Budget, (1 September 1990); doi: 10.1117/12.21374
Show Author Affiliations
Michael D. King, NASA/Goddard Space Flight Ctr. (United States)
Teruyuki Nakajima, NASA/Goddard Space Flight Ctr. (United States)
James D. Spinhirne, NASA/Goddard Space Flight Ctr. (United States)
Lawrence F. Radke, Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 1299:
Long-Term Monitoring of the Earth's Radiation Budget
Bruce R. Barkstrom, Editor(s)

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