摘要
为了探究沙尘污染过程中高时空分辨率的结构特征,利用相干多普勒测风激光雷达、地面观测站、中分辨率成像光谱仪,结合卫星气溶胶光学厚度数据产品、欧洲中期天气预报中心第5代再分析资料(ERA5)以及混合单粒子拉格朗日积分轨道(HYSPLIT)后向轨迹模式,分析了2019-10-27~2019-10-28内蒙古自治区锡林郭勒盟一次典型的沙尘天气过程。结果表明,此次沙尘是受高空冷涡、蒙古气旋的共同影响,配合冷锋在高温时段过境沙源地,热力叠加动力条件有利于沙尘随西风扩散;沙尘来临前后,地表气温变化明显;卫星产品、HYSPLIT模式结合雷达风廓线可以更准确地确定沙尘来源,激光雷达反演的气溶胶消光系数可反映边界层大气中气溶胶的变化情况;2019-10-28T02:00地面PM10的质量浓度达到最大值268μg/m^(3),消光系数超过30km^(-1),达到最大值,雷达反演数据在时间上会有延迟;城市下垫面使得沙尘污染快速减弱,雷达所在的草地下垫面容易受垂直风切变影响产生持续性污染。该研究对应用相干多普勒测风激光雷达、认识沙尘的污染过程以及传输特性很有帮助。
In order to explore the structural characteristics of high spatial and temporal resolution in the process of sand and dust pollution,a typical dust weather process on 2019-10-27~2019-10-28 in Xilin Gol League of Inner Mongolia Autonomous Region was analyzed using coherent Doppler wind light detection and ranging(LiDAR),ground observation station,aerosol optical depth(AOD)data product of medium resolution image spectrometer satellite,European Centre for Medium-Range Forecasts the 5th reanalysis data(ERA5),and hybrid single particle Lagrangian integrated trajectory(HYSPLIT)backward trajectory model.The results show that the dust was affected by the high altitude cold vortex and the Mongolian cyclone,and the cold front passed over the sand source area of the central and western Mongolia and the western Inner Mongolia Autonomous Region during the high temperature period.The thermal superposition dynamic conditions were favorable for the dust to spread with the westerly wind.The surface temperature changes obviously before and after the arrival of dust.Satellite products,HYSPLIT mode combined with wind profile of LiDAR can more accurately determine the source of dust.At 02:00 on 2019-10-28,the mass concentration of ground PM10 reached the maximum 268μg/m,and the extinction coefficient exceeded 30km and reached the maximum.Radar inversion data was delayed in time.The aerosol extinction coefficient retrieved by LiDAR can reflect the changes of aerosols in the boundary layer atmosphere.The urban underlying surface weakened the dust pollution rapidly,and the grassland underlying surface where the radar located was prone to be affected by vertical wind shear to produce persistent pollution.This research is helpful to application of coherent Doppler wind LiDAR,understand the pollution process and transmission characteristics of sand and dust.
作者
任超
程周杰
李荣忠
REN Chao;CHENG Zhoujie;LI Rongzhong(Beijing Institute of Aeronautical Meteorology, Beijing 100085, China;Qingdao Radium Measurement and Innovation Technology Co. Ltd., Qingdao 266101, China)
出处
《激光技术》
CAS
CSCD
北大核心
2022年第3期427-434,共8页
Laser Technology
关键词
大气与海洋光学
沙尘过程监测
相干多普勒测风激光雷达
气溶胶消光系数
下垫面
atmospheric and ocean optics
dust process detection
coherent Doppler wind LiDAR
aerosol extinction coefficient
underlying surface
