青海东北部一次臭氧污染过程机制研究  

Study on the formation mechanism of an ozone pollution event in Northeast Qinghai

作　　者：窦筱艳 高海鹏 陈珂 张志军 徐珣 李明戈 陶金花 陈良富 DOU Xiao-yan;GAO Hai-peng;CHEN Ke;ZHANG Zhi-jun;XU Xun;LI Ming-ge;TAO Jing-hua;CHEN Liang-fu(State Environmental Protection Key Laboratory of Tibetan Plateau Eco-Environmental Monitoring and Assessment,Qinghai Key Laboratory of Eco-Environmental Monitoring and Assessment,Qinhai Eco-environmental Monitoring Center,Xining 810007,China;State Key Laboratory of Remote Sensing Science,Aerospace Information Research Institute Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]国家环境保护青藏高原生态环境监测与评估重点实验室,青海省生态环境监测与评估重点实验室,青海省环境监测中心站,青海西宁810007 [2]中国科学院空天信息创新研究院,遥感科学国家重点实验室,北京100101 [3]中国科学院大学,北京100049

出　　处：《中国环境科学》2023年第S1期46-54,共9页China Environmental Science

基　　金：2021年中央大气污染防治专项资金-青海省“天地一体化”大气环境综合监测体系能力建设项目

摘　　要：利用地面观测数据、卫星数据和再分析资料,对2021年7月25日~8月3日青海东北部的臭氧超标过程进行分析.结果表明:从7月26日开始各站点臭氧浓度逐渐升高,并在7月30日至8月2日期间出现持续性大范围区域性臭氧超标,区域平均浓度较月平均高出20.9%.一方面,该时段区域地面辐射较强,气温显著上升,各站点平均增温超过10℃,有利于臭氧光化学反应生成,且地面一直处于弱风状态,扩散条件较差,造成污染物累积;另一方面,7月26日~31日区域垂直方向下沉气流加强,相对湿度降低,臭氧浓度明显增加,峰值阶段有55.7%站点浓度超过了170μg m^(-3).区域上空出现明显的对流层顶臭氧向近地面的垂直传输作用,是直接导致臭氧超标形成的重要原因.Based on surface observation,satellite and reanalysis data,an ozone pollution process from July 25th to August 3 rd,2021 in northeast Qinghai was analyzed.The results showed that the ozone concentration of each site gradually increased since July 26 th.A large-scale persistent regional pollution evolved from July 30 th to August 2 nd,with the regional averaged ozone concentration 20.9%higher than the monthly average.On the one hand,the surface radiation of the region was strong during this period,the temperature rose significantly,and the average increase of the sites exceeded 10°C,which is conducive to photochemical reactions of the ozone production.At the same time,the surface diffusion conditions were poor due to the continuous weak wind speed,causing the accumulation of pollutants.On the other hand,the region was mainly controlled by strong downdraft on the upper air and decreased relative humidity at surface from July 26 th to 31 st.The ozone concentration increased significantly,with the concentration exceeding 170μg/m^(3) at 55.7%of the sites in the peak of pollution.The obvious effect of ozone vertical transport from the top of troposphere to near surface is the immediate cause of ozone pollution of the region.

关 键 词：臭氧 污染 青海 气象条件 垂直传输 

分 类 号：X511[环境科学与工程—环境工程]