紫外多波长激光雷达的臭氧浓度反演及分析  

Inversion and Analysis of Ozone Concentration Using Ultraviolet Multi-Wavelength Lidar

作　　者：沈吉 曹念文 卢兴来 陈昊[1] 王晗 张东明 王志诚 汪章维 Shen Ji;Cao Nianwen;Lu Xinglai;Chen Hao;Wang Han;Zhang Dongming;Wang Zhicheng;Wang Zhangwei(Zhejiang Atmospheric Observation Technology Assurance Center,Hangzhou 310000,Zhejiang,China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,School of Atmospheric Physics,Nanjing University of Information Science and Technology,Nanjing 210044,Jiangsu,China)

机构地区：[1]浙江省大气探测技术保障中心,浙江杭州310000 [2]南京信息工程大学大气物理学院气象灾害预报预警与评估协同创新中心,江苏南京210044

出　　处：《中国激光》2024年第14期235-246,共12页Chinese Journal of Lasers

基　　金：国家重点研发计划(2023YFC3705300,2023YFC3705301);华东区域气象科技协同创新基金合作项目(QYHZ202314);2022年浙江省科技计划重点项目(2022C03150);浙江省气象局科技计划项目(2023QN11)。

摘　　要：在双波长差分吸收算法基础上,396 nm探测数据在气溶胶波长指数为1.0与消光-后向散射比为50且均出现50%偏差的情况下,会导致287/299 nm波长对信号反演的对流层臭氧质量浓度分别出现30.11±2.12μg/m~3与21.15±1.77μg/m~3的差异值。为反演得到较精确的臭氧质量浓度,利用全球自动观测网(AERONET)数据插值获得396 nm气溶胶的消光-后向散射比数据,将此数据结合紫外多波长激光雷达的396 nm通道数据来反演气溶胶光学参数,并根据不同气溶胶波长指数反演276/287、276/299、287/299 nm 3个波长对信号的臭氧质量浓度,通过查找最小臭氧质量浓度差值以获取较精确的气溶胶波长指数,所求的臭氧质量浓度是与气溶胶波长指数对应的两个臭氧质量浓度的平均值。以所求的气溶胶波长指数作为真值参照,发现当气溶胶波长指数假设值为1.0时会导致臭氧质量浓度的均方根误差为15.67μg/m~3。该结果表明4波长紫外激光雷达联合AERONET数据可反演得到气溶胶区域内较精确的臭氧质量浓度。Objective To address the severe ozone pollution in China in recent years,monitoring tropospheric ozone concentration has become extremely important for effectively controlling tropospheric ozone pollution.Lidar is suitable for the in-depth study of regional tropospheric ozone because of its high spatial resolution,fast real-time operation,and large dynamic range.The dual-wavelength differential absorption algorithm is widely used to retrieve ozone concentrations measured using lidar.Most researchers retrieve aerosol optical parameters using the assumed value of the aerosol extinction-backscatter ratio or the aerosol angstrom exponent (AE),after which these aerosol optical parameters are used to estimate the ozone-measurement error caused by aerosols.This results in a significant error in the retrieval of the tropospheric ozone concentration.To obtain a relatively accurate ozone concentration using the dual-wavelength differential absorption algorithm,we combine ultraviolet multiwavelength lidar (276,287,299,and 396 nm) data with aerosol extinction-backscatter ratios provided by AERONET to retrieve the tropospheric ozone concentration.This approach can reduce the deviation of the aerosol optical parameters.Methods Based on the dual-wavelength differential absorption algorithm,we retrieved the ozone concentrations in the aerosol zone using four-wavelength ultraviolet (UV) lidar (276,287,299,and 396 nm) data.A more accurate ozone-measurement error estimated using aerosol optical parameters retrieved from lidar data at 396 nm requires a more accurate aerosol AE and aerosol extinctionbackscatter ratio.To obtain a more accurate aerosol extinction-backscatter ratio,we interpolated multichannel data from AERONET to obtain aerosol extinction-backscatter ratios at 396 nm using a cubic spline function.These ratios were combined with the 396 nm channel data measured using the UV multiwavelength lidar to retrieve the aerosol optical parameters (aerosol extinction coefficient and aerosol backscattering coefficient).Subsequentl

关 键 词：激光雷达 臭氧 气溶胶 差分吸收 全球自动观测网 

分 类 号：P412[天文地球—大气科学及气象学] P413