Stochastic Cloud Clearing of Hyperspectral Radiances Observed by the Atmospheric InfraRed Sounder (AIRS) on the Aqua Satellite
Choongyeun Cho and David Staelin
American Meteorological Society (AMS) Conference on Satellite Meteorology and Oceanography (2004)
Abstract
This paper presents a stochastic approach to estimating cloud perturbations of hyperspectral radiances observed by the Atmospheric InfraRed Sounder (AIRS) on the National Aeronautics and Space Administration (NASA) Aqua satellite, launched in May 2002. The proposed cloud-clearing algorithm estimates the effects of clouds on AIRS radiances based on 294 infrared radiances from AIRS and 5 microwave channels from the Advanced Microwave Sounding Unit (AMSU), and then compensates these radiances for the cloud effects. Each cloud-cleared radiance spectrum corresponds to a ~50-km cell for which the infrared spectra of 9 independent sub-cells with ~15-km resolution are examined. The nine sub-cells are arranged in a 3x3 array. Each 50-km estimate is based on spectra from two or more 15-km sub-cells. The proposed stochastic cloud-clearing algorithms and alternatives will be compared.Download
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