Abstract
A modified AVHRR multispectral imaging instrument is to be flown on the NOAA polar-orbiting satellites beginning with NOAA-K, and is designated AVHRR-K/L/M. The instrument will include a narrowed near-visible Channel 2 centered at 0.85 μm, and a new near-infrared Channel 3A centered at 1.6 μm. In this study, we describe a retrieval method for marine stratus cloud droplet size which utilizes the radiance measurements in these channels. Factors which influence the sensitivity and accuracy of the estimation method are discussed, and results of model simulations designed to test the method are presented. Potential retrieval errors due to haze within the boundary layer are identified. It is concluded that the effective radius of the cloud droplet size distribution can be retrieved for clouds of optical depth seven or greater which fill the AVHRR radiometer field of view.
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