星地联合观测北京沙尘天气时空过程分布特征  

Spatiotemporal Distribution Characteristics of Dust Weather in Beijing Based on Satellite-ground Joint Observations

作　　者：郭畅 王丽东 李静 戴学兵 GUO Chang;WANG Lidong;LI Jing;DAI Xuebing(Beijing Research Institute of Telemetry,Beijing 100076,China)

机构地区：[1]北京遥测技术研究所,北京100076

出　　处：《遥测遥控》2024年第6期37-47,共11页Journal of Telemetry,Tracking and Command

基　　金：国家重点研发计划资助(2023YFC3007803)。

摘　　要：2021年3月27日~29日,我国北方地区经历了一次大范围、长时间的沙尘暴污染过程。本文通过使用MODIS(中分辨率成像光谱仪)卫星数据、地基多波长拉曼偏振激光雷达以及后向轨迹模型HYSPLIT(混合单粒子拉格朗日综合轨迹),开展星地联合观测,分析了此次沙尘天气的水平和垂直分布特征及其传输过程。同时,利用中国环境监测总站提供的小时实况数据、AERONET(气溶胶自动观测网)的光学厚度数据以及MCD19A2(全球气溶胶数据集)产品对激光雷达的反演结果进行了验证。研究结果显示:(1)本次沙尘主要通过戈壁沙漠北部4公里高度输送,并与本地污染物混合后沉降;(2)沙尘天气期间,PM_(10)浓度显著上升,最大值超过2 492.65μg/m^(3),PM_(2.5)浓度最大值为236.48μg/m^(3),当天光学厚度最高值达到4.1;(3)太阳光度计与激光雷达反演光学厚度趋势一致,相关性达95.63%;激光雷达反演PM_(10)、PM_(2.5)分别与官方公布数据的相关性达到85.93%和98.47%,验证了地基多波长拉曼偏振激光雷达系统的探测能力与精度。From March 27-29,2021,a large-scale and prolonged dust pollution event occurred in the north of China.This study analyzed the optical properties,vertical distribution,and transport patterns of dust aerosols using data from MODIS and groundbased lidar (AMPLE-001),combined with the HYSPLIT model.Additionally,hourly data from the China Environmental Monitoring Station and aerosol optical depth (AOD) data from MCD19A2 and AERONET were used to verify the accuracy of the ground-based lidar measurements.The key findings are as follows:(1) The dust was primarily transported at an altitude of 4 km over the northern Gobi Desert,and mixed with local pollutants and then settled.(2) During the dust event,particulate matter concentrations surged dramatically.PM_(10) concentrations peaked at over 2 492.65μg/m^(3),while PM_(2.5) reached a maximum of 236.48μg/m^(3).The highest recorded AOD was 4.1,with dust pollution being most severe in the southern and eastern parts of Beijing,Tianjin,and Hebei.(3) In terms of accuracy validation,comparisons between AOD values from sun photometers and lidar showed a strong correlation,with a correlation coefficient of 95.63%.Similarly,the PM_(10) and PM_(2.5) data from ground-based lidar were highly consistent with official monitoring data,with correlation coefficients of 85.93% and 98.47%,respectively.These results validate the detection capability and accuracy of the AMPLE-001 ground-based lidar system.

关 键 词：激光雷达 拉曼偏振 AERONET 沙尘 光学厚度 MCD19A2 

分 类 号：P445.4[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]