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上海地区PM_(2.5)-O_3复合污染特征及气象成因分析
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  • 英文篇名:Analysis of characteristics and meteorological causes of PM_(2.5)-O_3 compound pollution in Shanghai
  • 作者:毛卓成 ; 许建明 ; 杨丹丹 ; 余钟奇 ; 瞿元昊 ; 周广强
  • 英文作者:MAO Zhuo-cheng;XU Jian-ming;YANG Dan-dan;YU Zhong-qi;QU Yuan-hao;ZHOU Guang-qiang;Yangtze River Delta Center for Environmental Meteorology Prediction and Warning,Shanghai Key Laboratory of Meteorology and Health;
  • 关键词:PM2.5-O3复合污染 ; 气象因子 ; 阈值 ; 天气形势
  • 英文关键词:PM2.5-O3 compound pollution;;meteorological factors;;thresholds;;weather situation
  • 中文刊名:ZGHJ
  • 英文刊名:China Environmental Science
  • 机构:长三角环境气象预报预警中心上海市健康气象重点实验室;
  • 出版日期:2019-07-20
  • 出版单位:中国环境科学
  • 年:2019
  • 期:v.39
  • 基金:国家重点研发计划课题(2016YFC0201903)
  • 语种:中文;
  • 页:ZGHJ201907006
  • 页数:9
  • CN:07
  • ISSN:11-2201/X
  • 分类号:44-52
摘要
统计分析了上海地区2013~2017年PM_(2.5)-O_3复合污染事件及与气象条件的关系.结果表明,近5a上海PM_(2.5)-O_3复合污染天气占O_3总污染天气33.4%,仅出现在3~10月,呈逐年减少的趋势;PM_(2.5)-O_3复合污染时的O_3峰值浓度和平均浓度较单O_3污染时高,维持时间较单O_3污染时长,主要气象原因是地面辐合和较低的边界层高度;PM_(2.5)-O_3复合污染的天气形势往往与弱气压场有关,可以分为低压底部和前部、高压顶部和后部、均压场5种天气类型,其中均压场出现次数最多,占比53%;复合污染对气象因子的阈值要求更为严格,并且阈值区间总体向有利于PM_(2.5)浓度上升的方向偏移;当温度介于27.9~34℃,湿度介于43%~58%,风速介于2.1~3.3m/s,混合层高度介于1122~1599m,并且存在辐合时,最有利于PM_(2.5)-O_3复合污染发生.
        Simultaneous pollution events of PM_(2.5) and O_3(PM_(2.5)-O_3 compound pollution)in Shanghai from 2013 to 2017 and the relationship between PM_(2.5)-O_3 compound pollution and meteorological conditions were statistically analyzed.In the past five years,PM_(2.5)-O_3 compound pollution events accounted for 33.4%of total O_3 pollution events in shanghai,which only appeared between March and October and decreased by year.The peak O_3 concentration and average O_3 concentration during PM_(2.5)-O_3 compound pollution were higher than those during simplex O_3 pollution.The duration of O_3 pollution during PM_(2.5)-O_3 compound pollution events was longer than that of simplex O_3 pollution.The main meteorological reasons were ground convergence and low boundary layer height.The weather situation of PM_(2.5)-O_3 compound pollution was related to weak pressure field,which was categorized into5weather types,namely bottom of low pressure,front of low pressure,top of high pressure,rear of high pressure and equalized pressure.The equalized pressure mostly appeared,which accounted for 53%.The PM_(2.5)-O_3 compound pollution required strict meteorological threshold ranges,which were more conductive to PM_(2.5) concentration increasing than to O_3 concentration increasing.When the temperature was between 27.9~34℃,the humidity was between 43%~58%,the wind speed was between 2.1~3.3m/s,the height of the mixed layer was between 1122~1599m,and when there was convergence,it was the most conductive to the occurrence of PM_(2.5)-O_3 compound pollution.
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