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首页> 外文会议>International Laser Radar Conference >THE RETRIEVAL OF EXTINCTION PROFILES IN OPTICALLY-INHOMOGENEOUS CLOUD AND AEROSOL LAYERS DETECTED BY THE CALIPSO LIDAR
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THE RETRIEVAL OF EXTINCTION PROFILES IN OPTICALLY-INHOMOGENEOUS CLOUD AND AEROSOL LAYERS DETECTED BY THE CALIPSO LIDAR

机译：Calipso LIDAR检测到的光学不均匀云和气溶胶层中的消光分布的检索

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摘要

The retrieval of profiles of extinction from elastic backscatter lidar data requires the knowledge of the relationship between the two unknowns in the lidar equation, commonly called the particulate extinction-to-backscatter ratio, or lidar ratio, S. Two common approaches to obtaining a value of the lidar ratio are the use of representative, tabulated data, and the use of independent measurements of the optical thickness of the cloud or aerosol feature being studied. In the second approach, the optical thickness of an elevated, isolated layer can often be determined by comparing the magnitude of the backscatter from clear air above and below the layer. If the lidar ratio is assumed to be constant throughout the layer, a constrained retrieval of the extinction profile is possible. This paper also considers those cases where a layer is physically or optically inhomogeneous and contains more than one type of scatter with the result that the lidar ratio is not constant through the layer. In such cases there are more unknowns than measurements (constraints) and a unique, constrained solution is not possible. For the analysis of such data measured by the CALIPSO lidar, we propose a method that guarantees an extinction profile solution that, when integrated through the layer, gives a calculated optical thickness, τ, that is consistent with the measured signal reduction across the layer.
机译：从弹性反向散射延迟雷达数据中的灭绝谱的检索需要了解激光雷达方程中的两个未知数的关系，通常称为颗粒灭绝 - 反向散射率，或激光脉率，S。获得价值的两个常见方法LIDAR比率是使用代表性，制表数据和使用的独立测量的云或气溶胶特征的光学厚度。在第二种方法中，通常可以通过将反向散射的大小与层上方和下方的透明空气的幅度进行比较来确定升高的隔离层的光学厚度。如果在整个层中假设LIDAR比率是恒定的，则可能是可能的灭绝谱的约束检索。本文还认为层在物理上或光学不均匀并且含有多于一种散射的那些情况，结果使LIDAR比不能通过层恒定。在这种情况下，还有比测量值（约束）和唯一的受限解决方案更为未知。为了分析由CALIPSO LIDAR测量的这种数据，我们提出了一种方法，该方法可确保灭绝曲线解的方法，当通过层集成时，给出计算出的光学厚度τ，其与整个层的测量信号减少一致。

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