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Proceedings Paper

Rapid forward and adjoint calculations of thermal hyperspectral radiances in cloudy atmospheres
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Paper Abstract

Top-of-atmosphere radiances and adjoint sensitivities for ice clouds at 600-2300 cm-1 are studied using a new fast radiative transfer system (forward, tangent linear, and adjoint) developed for the NASA/NOAA/DOD Joint Center for Satellite Data Assimilation. The radiative transfer model is based on a hybrid solution method for computing thermal radiances that fully accounts for multiple scattering and that allows clouds to be placed at any number of arbitrary layers. Called the successive order of interaction model, it has been shown to be faster in most cases and more accurate than the popular delta-Eddington model. Ice particle scattering properties are obtained from rigorous scattering theory for various particle shapes and sizes. Gas optical depths are derived from line-by-line calculations. Results indicate that top-of-atmosphere brightness temperatures are sensitive to ice water path occurring in multiple cloud layers, which suggests major challenges for retrieving cloud properties under conditions other than single-layered clouds.

Paper Details

Date Published: 29 August 2005
PDF: 6 pages
Proc. SPIE 5890, Atmospheric and Environmental Remote Sensing Data Processing and Utilization: Numerical Atmospheric Prediction and Environmental Monitoring, 58901A (29 August 2005); doi: 10.1117/12.620056
Show Author Affiliations
Thomas J. Greenwald, Cooperative Institute for Meteorological Satellite Studies (United States)
Ralf Bennartz, Univ. of Wisconsin/Madison (United States)
Hung-Lung Huang, Cooperative Institute for Meteorological Satellite Studies (United States)
Chris O'Dell, Univ. of Wisconsin/Madison (United States)
Andrew Heidinger, NOAA/NESDIS (United States)


Published in SPIE Proceedings Vol. 5890:
Atmospheric and Environmental Remote Sensing Data Processing and Utilization: Numerical Atmospheric Prediction and Environmental Monitoring
Hung-Lung Allen Huang; Hal J. Bloom; Xiaofeng Xu; Gerald J. Dittberner, Editor(s)

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