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Proceedings Paper

Retrieval of cloud geometrical properties using optical remote sensing data
Author(s): Makoto Kuji; Teruyuki Nakajima; Sonoyo Mukai
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Paper Abstract

It is of great interest to investigate the properties on the cloud optical, microphysical, and geometrical parameters, in particular, of low-level marine clouds which play crucial influence on the global climate system. Top height, base height, and geometrical thickness of cloud layer are considered here as cloud geometrical parameters. These parameters are very important to retrieve, because top and base heights are the factors which govern the strength of greenhouse effect through the thermal radiation from/to cloud layer, whereas the geometrical thickness is the key parameter for the estimation of gaseous absorption in cloud layer where multiple scattering process dominates. In this study, an algorithm was developed to retrieve simultaneously cloud optical thickness, effective particle radius, top height, and geometrical thickness of cloud layer from the spectral information of visible, near infrared, thermal infrared, and oxygen A band channels. This algorithm was applied to FIRE (First ISCCP Regional Experiment, 1987) airborne data which included the above four channels and targeted at the low-level marine clouds off the coast of California in summer. The retrieved results seems to be comparable to the in situ microphysical observation although further validation studies are required for the cloud geometrical parameters in particular.

Paper Details

Date Published: 18 April 2003
PDF: 11 pages
Proc. SPIE 4882, Remote Sensing of Clouds and the Atmosphere VII, (18 April 2003); doi: 10.1117/12.462575
Show Author Affiliations
Makoto Kuji, Nara Women's Univ. (Japan)
Teruyuki Nakajima, Univ. of Tokyo (Japan)
Sonoyo Mukai, Kinki Univ. (Japan)

Published in SPIE Proceedings Vol. 4882:
Remote Sensing of Clouds and the Atmosphere VII
Klaus P. Schaefer; Olga Lado-Bordowsky; Adolfo Comeron; Richard H. Picard, Editor(s)

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