ERA5对拉曼激光雷达水汽反演的标定与分析  

ERA5 calibration and analysis of water vapor inversion of Raman LiDAR

作　　者：王雯慧 曹念文[1] WANG Wen-hui;CAO Nian-wen(School of Atmospheric Physics,Nanjing University of Information Science and Technology,Nanjing 210044,China;Zibo Meteorological Bureau,Zibo 255000,China)

机构地区：[1]南京信息工程大学大气物理学院,江苏南京210044 [2]淄博市气象局,山东淄博255000

出　　处：《激光与红外》2025年第1期120-129,共10页Laser & Infrared

基　　金：国家重点研发计划项目(No.2023YFC3705301,No.2018YFC0213100,No.2017YFC0209603)资助。

摘　　要：在探测大气水汽方面,拉曼激光雷达是精度较高的探测方法。探空资料经常用来对拉曼激光雷达反演水汽进行标定和对比分析,但是探空资料在时间和空间上具有局限性,在无探空数据时,拉曼激光雷达的标定和反演受限。ERA5再分析资料与探空资料的相似度较高,时空分辨率比探空数据高。对安徽地区ERA5水汽混合比数据的适用性进行了分析,结果表明在安徽两个探空站ERA5资料与探空资料的水汽混合比相关性较好,整体偏差较小。因此在无探空数据的合肥地区,选择ERA5再分析资料作为参考数据,对拉曼激光雷达反演水汽混合比进行标定。将标定常数代入水汽混合比的反演公式,得到水汽混合比在高度上的垂直廓线,将反演结果与探空站插值得到的合肥水汽混合比廓线进行对比分析,在0.5~1.5 km高度内,相对误差大概在-15%~7%范围内。结果表明拉曼激光雷达反演的水汽混合比与探空站插值得到的合肥水汽混合比具有较好的一致性,验证了ERA5资料对拉曼激光雷达反演水汽混合比标定的可行性。Raman LiDAR is a highly accurate method for detecting atmospheric water vapor.Sounding data are often used for calibration and comparative analysis of Raman lidar inversions of water vapour,but sounding data have limitations in time and space,and the calibration and inversion of Raman lidar are restricted when sounding data are not available.The ERA5 reanalysis data have a higher similarity to sounding data,and the temporal and spatial resolution is higher than that of sounding data.The applicability of ERA5 water vapor mixing ratio data in Anhui is analyzed and the results show that the water-vapour mixing ratios of the ERA5 data and the sounding data at two sounding stations in Anhui correlate well with each other,and the overall deviation is small.Therefore,in Hefei where there is no radiosonde data,the ERA5 reanalysis data is selected as the reference data to calibrate the water vapor mixing ratio retrieved by Raman LiDAR.The calibration constant is substituted into the inversion formula of the water-vapor mixing ratio,and the vertical profile of water vapor mixing ratio at height is obtained.The inversion results are compared with the water vapor mixing ratio profile of Hefei obtained by the data interpolation of the radiosonde station,and the relative error is about-15%~7%at the altitude of 0.5 km~1.5 km.The results show that the water vapor mixing ratio obtained by Raman LiDAR is in good agreement with the water vapor mixing ratio obtained by the data interpolation of the radiosonde station,which verifies the feasibility of ERA5 data for calibration of water vapor mixing ratio retrieved by Raman LiDAR.

关 键 词：拉曼激光雷达 水汽混合比 ERA5再分析资料 探空资料 

分 类 号：P407.5[天文地球—大气科学及气象学] TN958.98[电子电信—信号与信息处理]