北京市东南郊区夏季低层大气臭氧浓度垂直分布特征  

Vertical Distribution of Ozone in Lower Atmosphere in Summer in the Southeastern Suburb of Beijing

作　　者：王琴 景宽 王陈婧 刘保献 沈秀娥 张健 刘洋 罗霄旭 WANG Qin;JING Kuan;WANG Chenjing;LIU Baoxian;SHEN Xiu´e;ZHANG Jian;LIU Yang;LUO Xiaoxu(Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology,Beijing Municipal Ecological Environment Monitoring Center,Beijing 100048,China)

机构地区：[1]北京市生态环境监测中心,大气颗粒物监测技术北京市重点实验室,北京100048

出　　处：《环境科学研究》2024年第4期686-695,共10页Research of Environmental Sciences

基　　金：北京市科技支撑环境治理项目(No.Z211100004321006)。

摘　　要：为探究臭氧污染季北京市臭氧浓度垂直分布特征及对近地面臭氧浓度的影响,基于差分吸收臭氧激光雷达,对北京市东南郊区永乐店2019年5−9月低层大气臭氧浓度的垂直分布进行连续观测和分析.结果表明:①1.5 km以下,臭氧浓度随高度的增加呈先增后降的特征,边界层中上部(0.5~0.6 km)为臭氧浓度最大区域;1.5~3 km,臭氧浓度相对稳定或随高度增加而缓慢上升.臭氧浓度最高的6月,其浓度垂直梯度变化率略小于其他月份.②边界层内臭氧浓度与近地面臭氧浓度的日变化基本一致,均呈午后单峰分布特征;但近地面的臭氧浓度波动幅度较大,具有更低的早高峰谷值和更高的午后峰值.午后峰值期间,边界层内臭氧浓度垂直分布呈随高度升高而降低特征,体现出午后近地面光化学生成是臭氧升高的主要原因.夜间高空臭氧浓度高于近地面,可为翌日白天的臭氧浓度提供较高的背景.③典型臭氧污染过程显示,午后快速的光化学生成导致近地面和边界层中部以下臭氧浓度明显上升,部分夜间残留层可见明显的臭氧污染层,并于翌日上午向下传输;夜间低空急流、风向的切变及持续偏南风等气象条件也易导致臭氧垂直或水平传输至北京市.研究显示,应强化本地前体物控制及区域联防联控,实现边界层内臭氧浓度整体降低对臭氧污染治理至关重要.In order to investigate the vertical distribution characteristics of ozone and its influence on near surface ozone,the vertical distribution of lower atmospheric ozone in the southeastern suburb of Beijing(Yongledian,YLD)was continuously observed from May to September 2019,based on the differential absorption ozone lidar,The results showed that:(1)As the heigh tincreasing,the ozone concentration below 1.5 km increased first and then decreased.The maximum ozone concentration was located in the middle and upper part of the boundary layer at 0.5-0.6 km.The ozone concentrations between 1.5 km and 3.0 km were relatively stable or increased slowly with the increasing height.In June,when the ozone concentration was highest,the gradient rate with height was smaller than that in other months.(2)The diurnal variations of ozone in the boundary layer showed similar pattern of near surface,with a single peak in the afternoon.However,the near surface ozone concentration fluctuated greatly,with lower morning valley and higher afternoon peak.During the afternoon peak,the ozone concentration in the boundary layer decreased with the increasing of height,indicating that the photochemical production was the main reason for the enhanced ozone concentration in the afternoon.The high-altitude ozone pollution at night may provide a background concentration for ozone in the next day.(3)The typical ozone pollution episodes showed that the rapid photochemical production leaded to a significant increase of ozone concentration in the lower altitude in the afternoon.Ozone pollution layers can be seen in residual layer at night during several pollution days,and then downward transport to the surface in the morning of the next day.Meanwhile the low-level jet,wind shear and southerly wind also led the downward or advection transport of ozone to Beijing.It is essential for ozone pollution control to reduce the local precursors and improve regional joint prevention and control to reduce the whole boundary layer ozone concentration.

关 键 词：北京市 臭氧雷达 臭氧 垂直分布 臭氧污染过程 

分 类 号：X513[环境科学与工程—环境工程]