Accurately quantifying the concentration and transport flux of atmospheric fine particu-late matter(PM2.5)is vital when attempting to thoroughly identify the pollution formation mechanism.In this study,the mobile lidar measurements in Beijing on heavily polluted days in December from 2015 to 2018 are presented.The lidar was mounted on a vehicle,which could perform measurements along designated routes.On the basis of mobile lidar mea-surements along closed circuits of the 6th Ring Road around Beijing,the spatial distribution and transport flux of PM2.5 in Beijing were determined with information of wind field.In the spatial distribution,both the concentration and transport of PM2.5 were revealed to be more significant in the southern section of Beijing.The regional transport layer at heights＜1.3 km plays an important role in pollution formation.The maximum transport flux reached 1600μg/(m2*sec)on 11 December 2016.With the aerosol boundary layer height determined from the image edge detection(IED)method,the inter-annual variations of the aerosol boundary layer height(ABLH)were also analysed.The ABLH decreased from 0.73 to 0.46 km during the same heavy pollution period from 2015 to 2018.Increasingly adverse aerosol boundary layer(ABL)meteorological factors,including lower ABLH,light winds,temperature inversions,and accumulated moisture,have become necessary for pollution formation in Beijing.

Lihui Lu;Tianshu Zhang;Yan Xiang;Wenxuan Chai;Wenqing Liu

Information Materials and Intelligent Sensing Laboratory of Anhui Province,Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China;Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China;China National Environmental Monitoring Centre,Beijing 100012,China

环境科学学报（英文版）

[1]Lihui Lu;Tianshu Zhang;Yan Xiang;Wenxuan Chai;Wenqing Liu-.Distribution and transport characteristics of fine particulate matter in beijing with mobile lidar measurements from 2015 to 2018)[J].环境科学学报（英文版）,2022(05):65-75

beijing,ABLH

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