Witschas Benjamin, Lemmerz Christian, Reitebuch Oliver
Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen 82234, Germany.
Appl Opt. 2012 Sep 1;51(25):6207-19. doi: 10.1364/AO.51.006207.
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) andthe Earth Clouds, Aerosols, and Radiation Explorer Mission (EarthCARE).
几种大气激光雷达技术依赖于对空气中分子散射光光谱线形状的确切了解，然而，到目前为止，在实际大气中尚未对其进行精确测量。在本文中，我们报告了利用从位于德国最高峰楚格峰下方的雪费纳豪斯山天文台（海拔2650米）进行的水平激光雷达测量（波长λ = 355纳米，仰角θ = 180°）对大气中自发瑞利 - 布里渊散射的研究。据我们所知，这些激光雷达测量首次证明了大气中布里渊散射的效应。测量结果证实，Tenti S6模型可用于充分描述在实际大气条件下空气中散射光的自发瑞利 - 布里渊光谱。本文所呈现的结果对于像部署在大气动力学使命风神卫星（ADM - Aeolus）和地球云层、气溶胶与辐射探测使命卫星（EarthCARE）上的光谱分辨激光雷达具有重要意义。
