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介绍一台用于夜晚探测大气温度分布的L6 2 5瑞利 拉曼 (Rayleigh Raman)散射激光雷达。采用Nd∶YAG激光器三倍频输出 35 5nm作为发射激光 ,利用弱光子计数技术检测大气中分子的瑞利散射和N2 分子振动拉曼散射回波 ,分析得到了平流层和对流层中上部大气温度的垂直分布廓线。其观测结果分别与HALOE/UARS卫星和无线电气象探空仪结果进行了对比分析。其中 ,激光雷达观测的平流层温度与HALOE卫星的结果对比表明 ,它们在高度 2 5～ 6 5km内显示出较好的一致性 ,2 0个夜晚的平均温度差别基本上小于 2K。激光雷达与无线电气象探空仪探测的对流层温度在高度为 5～ 18km内反映了较为一致的分布趋势 ,15个夜晚的平均温度差别在 6～ 16 5km高度内小于 3K。这些结果表明 ,L6 2 5瑞利 拉曼散射激光雷达观测数据可靠 ,可用于大气温度分布的常规观测和分析研究。
A L6 2 5 Rayleigh Raman Scattering Lidar is used to detect atmospheric temperature distribution at night. In this paper, we use the triplet frequency of Nd: YAG laser to emit 355nm as the emission laser and detect the Rayleigh scattering and N2 molecular vibration Raman scattering echoes of the atmosphere using the weak photon counting technique. The temperature of upper atmosphere in the stratosphere and troposphere Vertical profile. The observations were compared with the results of the HALOE / UARS satellite and radiosonde respectively. Among them, the comparison between the stratospheric temperature observed by lidar and the result of HALOE satellite shows that they show good consistency in the height of 25-650km, and the average temperature difference in 20 nights is basically less than 2K. The tropospheric temperatures detected by LIDAR and radiosonde reflect a more consistent distribution trend at altitudes of 5 ~ 18 km, and the average nighttime temperature differences are less than 3 K at 6-16 km height. These results show that the L6 2 5 Rayleigh Raman scattering lidar data are reliable and can be used for routine observation and analysis of atmospheric temperature distribution.