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Horizontal lidar measurements for the proof of spontaneous Rayleigh-Brillouin scattering in the atmosphere

机译：水平激光雷达测量，用于证明大气中自发的瑞利-布里渊散射

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摘要

Several atmospheric lidar techniques rely on the exact knowledge of the spectral line shape of molecular scattered light in air, which, however, has not been accurately measured in real atmosphere up to now. In this paper we report on the investigation of spontaneous Rayleigh-Brillouin scattering within the atmosphere, utilizing horizontal lidar measurements (λ = 355 nm, θ = 180°) performed from the mountain observatory Schneefernerhaus (2650 m), located below Germany's highest mountain, the Zugspitze. These lidar measurements give proof of the effect of Brillouin scattering within the atmosphere for the first time to our knowledge. The measurements confirm that the Tenti S6 model can be used to adequately describe spontaneous Rayleigh-Brillouin spectra of light scattered in air under real atmospheric conditions. The presented results are of relevance for spectrally resolving lidars like those deployed on the Atmospheric Dynamics Mission Aeolus (ADM-Aeolus) and the Earth Clouds, Aerosols, and Radiation Explorer Mission (EarthCARE).
机译：几种大气激光雷达技术依赖于空气中分子散射光的光谱线形状的确切知识，但是，到目前为止，在实际大气中还没有对其进行精确测量。在本文中，我们利用位于德国最高山峰以下的山天文台Schneefernerhaus（2650 m）进行的水平激光雷达测量（λ= 355 nm，θ= 180°）对大气中自发瑞利-布里渊散射进行了研究。楚格峰。据我们所知，这些激光雷达测量首次证明了布里渊散射在大气中的影响。测量结果证实，Tenti S6模型可用于充分描述真实大气条件下空气中散射光的自发瑞利-布里渊光谱。呈现的结果与光谱解析的激光雷达（如部署在大气动力学任务风神（ADM-Aeolus）和地球云，气溶胶和辐射探测器任务（EarthCARE）上的那些）具有相关性。

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