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首页> 外文期刊>Tellus. A >Correcting winds measured with a Rayleigh Doppler lidar from pressure and temperature effects
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Correcting winds measured with a Rayleigh Doppler lidar from pressure and temperature effects

机译：根据压力和温度影响校正使用瑞利多普勒激光雷达测量的风

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摘要

The molecular channel of the space-based Doppler lidar ADM-Aeolus relies on a double Fabry-Perot (FP) interferometer. The difference in photon numbers transmitted by the two FPs divided by their sum- the so-called Rayleigh response-is a function of the central frequency of the spectrum of the laser light backscattered by the atmosphere, so that a proper inversion enables the measurement of Doppler shifts and line-of-sight wind velocities. In this paper, it is shown that the relation-ship between the Rayleigh response and the Doppler shift does not depend on the sole characteristics of the instrument, but also on the atmospheric pressure and temperature (through the Rayleigh-Brillouin effect), and the likely presence of a narrow-band radiation due to particle scattering. The impact of these on the precision of inverted Doppler shifts (or line-of-sight winds) is assessed showing that a correction is needed. As they are lacking the appropriate precision, climatology profiles of pressure, temperature or aerosols cannot be used as an input. It is proposed to use data predicted by a numerical weather prediction system instead. A possible correction scheme is proposed. Its implication on the quality of retrieved Rayleigh winds is discussed.
机译：天基多普勒激光雷达ADM-Aeolus的分子通道依赖于双Fabry-Perot（FP）干涉仪。由两个FP传输的光子数之差除以它们的和（即所谓的瑞利响应），是由大气反向散射的激光光谱的中心频率的函数，因此适当的反演可以测量多普勒频移和视线风速。本文表明，瑞利响应与多普勒频移之间的关系不取决于仪器的唯一特性，而是取决于大气压力和温度（通过瑞利-布里渊效应）以及可能由于粒子散射而存在窄带辐射。评估了这些因素对倒置多普勒频移（或视线风）精度的影响，表明需要进行校正。由于它们缺乏适当的精度，因此不能将压力，温度或气溶胶的气候特征作为输入。建议使用数值天气预报系统预测的数据代替。提出了一种可能的校正方案。讨论了其对反演瑞利风质量的影响。

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