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29 August 2005 Rapid forward and adjoint calculations of thermal hyperspectral radiances in cloudy atmospheres
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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.
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Thomas J. Greenwald, Ralf Bennartz, Hung-Lung Huang, Chris O'Dell, and Andrew Heidinger "Rapid forward and adjoint calculations of thermal hyperspectral radiances in cloudy atmospheres", Proc. SPIE 5890, Atmospheric and Environmental Remote Sensing Data Processing and Utilization: Numerical Atmospheric Prediction and Environmental Monitoring, 58901A (29 August 2005);

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