大连市夏季典型点位臭氧激光雷达垂直监测结果分析

利用臭氧激光雷达对大连市夏季臭氧进行连续观测,分析夏季臭氧垂直廓线变化特征,结合风速风向、地面天气图、气流运动等分析臭氧污染过程、污染成因、传输来源。结果表明:大连市夏季臭氧垂直廓线呈单峰特征,峰值高度500~1 000 m,臭氧高空传输特征明显;高空臭氧逐日积累叠加,在下沉气流影响下与近地表污染混合,导致出现轻度臭氧污染天气,只有近地表臭氧生成时,出现臭氧污染天气可能性较低;后向轨迹分析表明,大连市臭氧污染传输主要来自山东、河北等区域。

The ozone laser radar is used to continuously observe the summer ozone in Dalian,the characteristics of the vertical ozone profile in summer are analyzed,and the ozone pollution process,pollution causes and transmission sources are analyzed in combination with wind speed and direction,ground weather map,air flow movement,etc.The results show that the vertical ozone profile in Dalian in summer is characterized by a single peak,the peak height is about 500-1000 m,and the characteristics of ozone upper air transmission are obvious;the upper ozone accumulates and stacks day by day,and mixes with the near surface pollution under the influence of the downdraft,resulting in a slightly polluted ozone weather.Only when the near surface ozone is generated,the possibility of ozone pollution weather is low;the latter trajectory analysis shows that the ozone pollution transmission in Dalian mainly comes from Shandong,Hebei regions.