大气与环境光学学报, 2018, 13 (3): 170, 网络出版: 2018-06-01  

拉曼激光雷达测量水汽的误差源分析研究

Analysis on Error Sources of Water Vapour Observed by Raman Lidar
作者单位
1 中国科学院安徽光学精密机械研究所中国科学院大气光学重点实验室, 安徽 合肥 230031
2 中国科学技术大学,安徽 合肥 230026
摘要
常规手段测量水汽的时空分辨率较低,激光雷达可以有效提高局 地短期天气预报的可信度。通过自研的拉曼激光雷 达,依据误差传递理论,分析水汽混合比的误差。同时,利用无线电探空仪与拉曼激光雷达对比。分析结果表明:激光雷达测量水汽主要包括定标常数、大气透过率 修正和测量信号三个误差源。其中,定标常数误差随高度不变,约为4%,是1.5 km以下误差的主要来源; 大气透过率修正误差随高度升高而增加,洁净天气下对相对误差的影响小于4%;测量信号误差在洁净天气下,较3 km高度以内一般小于20%, 在3 km高度以上,成为误差的主要来源。比对结果显示: 激光雷达计算误差和比对误差一致性较好。上述分析结果对于提高激光雷达在气象预报中的应用起到很好的辅助作用。
Abstract
When detecting water vapour, the traditional tools have low spatio-temporal resolution. Lidar can improve the credibility of weather forecast. According to the theory of error analysis, the error sources of water vapour and their contributions are investigated based on the experimental data. Meanwhile, the computed relative errors are compared with that calculated relative errors from Raman lidar and radiosonde data. It turns out that the error sources on water vapour observed by Raman lidar includes the calibration constant, the transmission correction and the Raman scattering signals. The calibration constant error is about 4% and constant with height, and the major contribution to the total error under 1.5 km height. The transmission correction error increases slowly along with the height and less than 4% in the condition of clean air. The Raman scattering signals error is less than 20% under 3 km height, but it becomes the main source above 3 km height. The comparison shows that the relative error derived by Raman lidar agrees well with the calculated relative error. In summary, the analysis results above are helpful to promote the application of Raman lidar in weather forecast.

史悦, 谢晨波, 谭敏, 王邦新, 吴德成, 刘东, 王英俭. 拉曼激光雷达测量水汽的误差源分析研究[J]. 大气与环境光学学报, 2018, 13(3): 170. SHI Yue, XIE Chenbo, TAN Min, WANG Bangxin, WU Decheng, LIU Dong, WANG Yingjian. Analysis on Error Sources of Water Vapour Observed by Raman Lidar[J]. Journal of Atmospheric and Environmental Optics, 2018, 13(3): 170.

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