远距离输送作用对南京大气污染的影响  

Influence of the long-distance air masses on atmospheric pollutants in Nanjing city

作　　者：刘世玺[1] 安俊琳[1] 朱彬[1] 王东东[1] 

机构地区：[1]南京信息工程大学大气物理与大气环境重点开放实验室,江苏南京210044

出　　处：《生态环境学报》2010年第11期2629-2635,共7页Ecology and Environmental Sciences

基　　金：国家973计划(2009CB426313);教育部博士点基金(20093228110003);江苏省高校自然科学基金项目(08KJB170005);中国科学院大气物理所LAPC开放课题(LAPC-KF-2008-08)资助

摘　　要：为了研究近地层大气污染物远程输送对于南京地区的影响,结合南京北郊观测点的观测资料,对2008—2009年南京地区气团的后向轨迹进行了聚类分析,结果表明:O3质量浓度分布呈双峰型,分别于5—6月和8—10月达到了高峰,两年共计有36 d质量浓度超过了国家环境空气质量标准二级标准,其中两次峰值期间占81%和83%。NO2和SO2在冬季较其他季节质量浓度高。到达南京气流轨迹以东部气团(占总数37%)为主。在东部气团影响下,南京周边地区近地层O3、NO2和SO2质量浓度分别为99.5、54.0和76.6μg.m-3,大气污染物质量浓度均较高。从后向轨迹分析认为,与气团途经并携带了重污染的长三角地区近地层排放的气体污染物有关。相对于其他来向的气团,东部气团对于南京地区近地层的影响更重要。The observation at the northern suburb of Nanjing city showed two peaks of the monthly averaged concentration of O3 from 2008 to 2009.One peak appeared from May to June,while the other appeared from August to October.There were 36 days to exceed the national II standard of O3（≥200 μg·m-3） during the monitoring period.The rates to exceed the standard were 81% at one peak and 83% at the other peak.The monthly averaged concentrations of NO2 and SO2 were highest in winter with the daily maximum 190 μg·m-3 of NO2 and 357.8 μg·m-3 of SO2.Cluster analysis of air mass backward trajectories in Nanjing showed the concentration of atmospheric pollutants was much high as air masses from the east area,which the averaged concentration of O3,NO2 and SO2 reached 117,47.5 and 76.6 μg·m-3,respectively.Compared with other air masses,the eastern air masses carried more of atmospheric pollutants from the Yangtze delta,which the influence was the most serious on the air quality of Nanjing city.

关 键 词：南京地区 污染气体 后向轨迹 聚类分析 

分 类 号：X16[环境科学与工程—环境科学]