13 October 2008 Method to correct both foam and rain effects on dual frequency altimeter Jason1 wind measurements in typhoon Shanshan
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Abstract
Altimetry data under extreme weather events such as tropical cyclones, typhoons and hurricanes are valuable although the measurements are affected by various factors associated with high sea states, such as big winds, high waves, especially atmospheric rains and ocean surface foams. Both rains and foams can strongly affect the propagation and reflection of microwave signal, but the effects of sea foam on altimeter measurements have not been adequately addressed. Although the sea foam only appears when the wind speed is high and ocean wave is breaking, the attenuation effect of foam in typhoons should not be neglected. The major challenge is the effects of rain and foam on altimeter received backscatter are similar and are hard to be separated. In this paper, we proposed a iterative method to correct both rain and sea foam effects using a simplified stratified foam model and the liquid water content measurements from nadir viewing Jason1 Microwave Radiometer. Finally a case study to maintain accurate wave height, wind speed, and rain rate measurements and to retrieve the additional results of foam coverage considering both the effects of rain and sea foam in the typhoon Shanshan is presented.
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Le Yang, Le Yang, Juhong Zou, Juhong Zou, Mingsen Lin, Mingsen Lin, Delu Pan, Delu Pan, } "Method to correct both foam and rain effects on dual frequency altimeter Jason1 wind measurements in typhoon Shanshan", Proc. SPIE 7105, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2008, 71050L (13 October 2008); doi: 10.1117/12.799623; https://doi.org/10.1117/12.799623
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