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首页> 外文会议>Remote Sensing of Clouds and the Atmosphere XII; Proceedings of SPIE-The International Society for Optical Engineering; vol.6745 >Optical properties of cirrus clouds at a mid-latitude EARLINET station
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Optical properties of cirrus clouds at a mid-latitude EARLINET station

机译：卷云在中纬度EARLINET站的光学特性

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摘要

Measurements performed with a backscatter and Raman lidar at Thessaloniki, Greece were used to characterize cirrus clouds and aerosol layers by determining their optical properties. This is achieved through the application of different post-processing algorithms. We retrieved the cirrus cloud's optical properties by using three independent mathematical methods. In the first method, an iterative procedure was used based on the criterion that forward and backward integration coincide to the desired degree of accuracy. In the second method, the optical depth of the cirrus cloud can be determined by comparing the backscattering signals just below and above the cloud if the lidar signals are correctly represent the scattering medium. The third method, the well known Raman method, is applicable to night time measurements and is capable for determining the vertical profile of lidar ratio. The results are considerably influenced by multiple scattering effects, that not taken into account and this leads to a significant underestimation of calculated cirrus optical depths and lidar ratios. To estimate and correct this effect we have applied a radiative transfer model that calculates the multiple scattering contributions for each cirrus case analyzed. We have compared the resulting optical depths and lidar ratios and found a good agreement between these methods. The comparison has been performed to the effective values of optical depth and lidar ratio.
机译：通过在希腊塞萨洛尼基的背向散射和拉曼激光雷达进行的测量，通过确定卷云和气溶胶层的光学特性来表征卷云和气溶胶层。这是通过应用不同的后处理算法来实现的。我们使用三种独立的数学方法检索了卷云的光学性质。在第一种方法中，基于前向和后向积分符合所需精度的准则，使用了迭代过程。在第二种方法中，如果激光雷达信号正确表示散射介质，则可以通过比较云下方和上方的反向散射信号来确定卷云的光学深度。第三种方法，众所周知的拉曼方法，适用于夜间测量，并且能够确定激光雷达比的垂直分布。结果受到多种散射效应的极大影响，而没有考虑在内，这会导致对计算出的卷云光学深度和激光雷达比的明显低估。为了估计和纠正这种影响，我们应用了辐射传递模型，该模型计算了每个分析的卷云的多重散射贡献。我们比较了所得的光学深度和激光雷达比，发现这些方法之间有很好的一致性。已经对光学深度和激光雷达比的有效值进行了比较。

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