反演同化技术在激光雷达中的应用研究  

Research on the Application of Inversion Assimilation Technology in Laser Radar

作　　者：杜嵩山[1] 赵文灿 王丽琼 左瑞亭 沈沉 DU Song-shan;ZHAO Wen-can;WANG Li-qiong;ZUO Rui-ting;SHEN Chen(Jiangsu Province Environmental Monitoring Center,Nanjing 210000,China;Nanjing Star-jelly Environmental Consultants Co.Ltd,Nanjing 210013,China;Zhejiang Deqing Meteorological Bureau,Deqing,Zhejiang 313200,China)

机构地区：[1]江苏省环境监测中心,南京210000 [2]南京雨后地软环境技术有限公司,南京210013 [3]浙江省德清县气象局,浙江德清313200

出　　处：《四川环境》2021年第1期36-45,共10页Sichuan Environment

基　　金：江苏省环境监测科研基金项目(1712);PM2.5和O3污染诊断与协同预警业务化平台(2018YFC0213804)。

摘　　要：为增强模式预报准确性,提高激光雷达数据在化学模式中的应用水平,建立激光雷达同化系统,将激光雷达数据引入模式,利用WRF-Chem模拟2016年12月6日~10日一次污染过程,将激光雷达监测的气溶胶光学深度(AOD)反演成近地面PM2.5浓度,通过三维变分同化技术订正模式原始场,调整模式预报结果。实验对比发现,反演同化后水平和垂直方向初始场调整显著,PM2.5、PM10和AQI的预报准确率明显提升,同化后相关性提高了0.05~0.1,预报准确率提高了10%~20%,分级风险评分也不同程度升高,与观测结果接近,优于不同化的预报结果。表明激光雷达数据在模式同化方面表现良好,有广阔的应用空间。In order to enhance the accuracy of model prediction and improve the application level of laser radar data in chemical models,a laser radar assimilation system is established to introduce laser radar data into the model.In this paper,WRF-Chem model was used to simulate a pollution process during the period from 6 to 10 December 2016.The aerosol optical depth(AOD)monitored by the laser radar was inverted into PM2.5 concentration near the ground,and the initial field of the model was revised through three-dimensional variational assimilation technology to adjust the model prediction results.The result showed that the horizontal and vertical initial field changed obviously after assimilation,and the prediction accuracy of PM2.5,PM10 and AQI were greatly improved,the correlation was increased by about 0.05 to 0.1,the prediction accuracy was increased by about 10% to 20%,and the graded risk score also rise after assimilation,which was close to the observed results and better than that of non-assimilation.The experiment showed that the laser radar data perform well in model assimilation and have wide development space.

关 键 词：激光雷达 WRF-Chem 三维变分同化 空气质量预报 反演算法 

分 类 号：X513[环境科学与工程—环境工程]