星载激光雷达探测海面风速昼夜差异研究

采用夜间数据反演海面风速已经取得较好的研究成果。由于受到太阳直射光和天空背景辐射等因素的影响，星载激光雷达信号在白天的信噪比较差。基于已有的反演关系模型，采用CALIPSO星载激光雷达532 nm通道2007年1月、4月、7月和10月的单脉冲昼夜数据，将AOD数据用来做大气双程透过率校正，以准同步的AMSR-E v7版本的海面风速为真值，进行反演海面风速的昼夜对比研究。研究结果表明，采用白天数据反演海面风速是可行的。通过采用恰当的关系模型来反演白天风速可以提高探测精度。

Comparison of day and night sea surface wind speed detection using CALIPSO lidar measurements

For retrieving sea surface wind speed, good results were achived with CALIPSO lidar night data. During daytime, spaceborne lidar has a poor signal to noise ratio due to the irradiation of direct sunlight and the sky. Based on the existing retrieval model, sea surface wind speeds of day and night were retrieved using CALIPSO lidar 532 nm day and night single-shot data of January, April, July and October in 2007, with aerosol optical depth (AOD) for two-way atmospheric transmittance correction. The collocated version 7 AMSR-E sea surface wind speeds were used as the true values for comparison. The results show that, it is feasible to use CALIPSO daytime lidar data for sea surface wind speed retrieval, and the precision can be increased with the use of appropriate retrieval model.