基于无人机垂直观测的眉山市臭氧污染个例对比分析OACSTPCD

In order to better understand the concentration distribution of O3 in the lower troposphere and the influ-ence of meteorological factors on O3 pollution,this paper used UAV(Unmanned Aerial Vehicle)to observe O3 concentration vertically,air temperature and relative humidity in Meishan city from June 27 to 30 and July 6 to 12,2022,and combines the weather situation,ground meteorological elements and HYSPLIT's 48 h backward trajecto-ry to compare and analyze the two processes from the near surface and vertical direction,respectively.The results showed that the daily variation of O3 concentration was obvious,the valley value near surface appeared at 06:00-08:00,and began to increase significantly around 10:00,then reaching a peak during 12:00-20:00.While the av-erage concentration of O3 in the vertical direction was lowest at 10:00 and rapidly enhanced at 12:00,fell slightly at 16:00 and peaked at 20:00.When the concentration of O3 near surface is high,the corresponding average verti-cal concentration is also higher;while the concentration of O3 near surface is higher than that in the vertical direc-tion,and the concentration of O3 in the 0～1000 m increases slightly and then decreases,and the peak mostly ap-pears in the height of 0～300 m above the ground.The correlation between O3 concentration and meteorological el-ements was significantly higher during the day than that during the night,positively correlated with temperature,negatively correlated with relative humidity and pressure,and positively correlated with wind speed,while the cor-relation between O3 concentration and relative humidity in the vertical direction was significantly different at differ-ent observation times.