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Aerosol Retrievals from CALIPSO Lidar Ocean Surface Returns

机译:CALIPSO激光雷达海面返回的气溶胶回收

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摘要

This paper describes approaches to retrieve important aerosol results from the strong lidar return signals that are received by the space-borne CALIPSO lidar system after reflecting off-ocean surfaces. Relations, from which the theoretically expected values of area under ocean surface returns can be computed, are presented. A detailed description of the lidar system response to the ocean surface returns and the processes of sampling and averaging of lidar return signals are provided. An effective technique that reconstructs the lidar response to surface returnsstarting from down-linked samplesand calculates the area under it, has been developed and described. The calculated area values are validated after comparing them to their theoretically predicted counterpart values. Methods to retrieve aerosol optical depths (AODs) from these calculated areas are described and retrieval results are presented, including retrieval comparison with independent AOD measurements made by an airborne High Spectral Resolution Lidar (HSRL) that yielded quite good agreement. Techniques and results are also presented on using the spectral ratios of the surface response areas to determine spectral ratios of aerosol round-trip transmission and AOD spectral difference, without need of a specific/accurate ocean-surface reflectance model.
机译:本文描述了从强激光雷达返回信号中获取重要气溶胶结果的方法,该信号由星载CALIPSO激光雷达系统在反射离海表面后接收到。提出了可以计算出海面回波面积理论上期望值的关系。提供了激光雷达系统对海面返回的响应的详细描述,以及激光雷达返回信号的采样和平均过程。已经开发并描述了一种有效的技术,该技术可以重建从下行链接的样本开始的激光雷达对表面返回的响应并计算其下​​的面积。将计算出的面积值与理论上预测的对应值进行比较后,对其进行验证。描述了从这些计算区域中检索气溶胶光学深度(AOD)的方法,并给出了检索结果,包括与机载高光谱分辨率激光雷达(HSRL)进行的独立AOD测量的检索比较,得出了很好的一致性。还提出了使用表面响应区域的光谱比来确定气溶胶往返传输的光谱比和AOD光谱差的技术和结果,而无需特定/准确的海洋表面反射率模型。

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