Sherlock V, Garnier A, Hauchecorne A, Keckhut P
Service d'Aeronomie, Centre National de la Recherche Scientifique, BP 3, 91371 Verrieres-le-Buisson, France.
Appl Opt. 1999 Sep 20;38(27):5838-50. doi: 10.1364/ao.38.005838.
Implementation of a Raman lidar measurement of middle and upper tropospheric water vapor is described for a system that uses a 532-nm exciting wavelength, fiber-optic signal transfer, and Q-branch selection. Particular attention is given to the minimization of systematic biases introduced by fluorescent reemission of energy associated with elastic backscatter returns. We compare lidar profiles with collocated radiosonde measurements by using the Vaisala H-Humicap capacitive captor. The variations in the water-vapor concentrations on vertical scales of the order of 1 km in the upper troposphere observed by the two instruments present significant differences. Independent characterization of random and systematic lidar measurement errors and radiosonde sensor response characteristics lead to the conclusion that these differences are due to radiosonde sensor response. These intercomparisons indicate that the lidar measurement can provide important information on water-vapor distributions in the radiatively important 8-11-km region.
描述了一种用于测量对流层中层和上层水汽的拉曼激光雷达测量方法，该系统使用532纳米激发波长、光纤信号传输和Q分支选择。特别关注了与弹性后向散射回波相关的能量荧光再发射所引入的系统偏差的最小化。我们通过使用维萨拉H-Humicap电容式传感器，将激光雷达廓线与并置的无线电探空仪测量结果进行比较。两种仪器观测到的对流层上层垂直尺度约为1公里的水汽浓度变化存在显著差异。对激光雷达测量的随机和系统误差以及无线电探空仪传感器响应特性进行独立表征后得出结论，这些差异是由无线电探空仪传感器响应引起的。这些相互比较表明，激光雷达测量可以提供关于辐射重要的8-11公里区域水汽分布的重要信息。
