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Proceedings Paper

Cloudy-sky optical pathlength distributions as derived from oxygen A-band observations
Author(s): Oliver Funk; Hartmut Boesch; F. Erle; H. J. Veitel; Ulrich Platt; K. Pfeilsticker
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Paper Abstract

Using high resolution spectroscopy of the atmospheric oxygen A-band rotational absorption lines (760-780 run}, the probability distribution of optical pathlengths were derived for clear and cloudy skies. A large enhancement of the mean optical pathlength and a systematic change in the form of the probability distribution is found for the cloudy sky. Our observations are compatible with Gamma type distributions. The measurements are compared with a radiative transfer model in order to validate the treatment of the multiple Mie-scattering in clouds. Our measurements show a significant discrepancy compared to a model (DISORT) assuming plane parallel homogenous cloudiness. Larger cloudy sky optical paths may contribute to explain the intensely debated anomalous cloud absorption. These measurements can serve as direct input for atmospheric heating calculations. Keywords: multiple Mie scattering, heterogeneous clouds, oxygen A-band, Gamma distribution

Paper Details

Date Published: 1 January 1997
PDF: 8 pages
Proc. SPIE 3220, Satellite Remote Sensing of Clouds and the Atmosphere II, (1 January 1997); doi: 10.1117/12.301171
Show Author Affiliations
Oliver Funk, Univ. of Heidelberg (Germany)
Hartmut Boesch, Univ. of Heidelberg (Germany)
F. Erle, Univ. of Heidelberg (Germany)
H. J. Veitel, Univ. of Heidelberg (Germany)
Ulrich Platt, Univ. of Heidelberg (Germany)
K. Pfeilsticker, Univ. of Heidelberg (Germany)

Published in SPIE Proceedings Vol. 3220:
Satellite Remote Sensing of Clouds and the Atmosphere II
Joanna D. Haigh, Editor(s)

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