风向对北京市重污染日PM_(2.5)浓度分布影响研究  

Effects of Wind Direction on Spatial Distribution of PM_(2.5) During Heavy Pollution Days in Beijing

作　　者：程念亮[1,2] 张大伟[1] 李云婷[1] 陈添[3] 邹本东[1] 王欣[1] 郇宁[1] 陈晨[1] 孙乃迪[1] 孟凡[4] 

机构地区：[1]北京市环境保护监测中心,北京100048 [2]北京师范大学水科学研究院,北京100875 [3]北京市环境保护局,北京100048 [4]中国环境科学研究院环境基准与风险评估国家重点实验室,北京100012

出　　处：《环境科学与技术》2016年第3期143-149,161,共8页Environmental Science & Technology

基　　金：环保公益性行业科研专项(201409005);国家科技支撑计划课题(2014BAC23B03);北京市空气质量达标规划课题(Z131100005613046)

摘　　要：对2013年北京市58 d重污染日PM_(2.5)浓度水平进行了分析,并用克里格插值法统计了重污染期间不同风向PM_(2.5)不同浓度区间的国土面积。结果显示2013年北京市重污染日主要集中在冬季,占到全年天数的15.9%,且重污染日PM_(2.5)平均浓度为218μg/m3;重污染日PM_(2.5)空间分布较为均匀且统计的平均浓度在150μg/m3以上的国土面积约占总面积的82%;重污染期间重度污染(>150μg/m3)以上面积占比分别为南风(87%)、东风(81%)、西风(70%)、北风(66%);重污染日不同风向下ρ(NO_3^-)、ρ(NH_4^+)、ρ(SO_4^(2-))之和约占ρ(PM^(2.5))的60%~65%,且各组分浓度相差不大。The spatial and temporal distribution of PM2.5during heavy pollution days was analyzed and the proportions of land area of Beijing City hit by smog with different PM2.5concentrations at different wind directions were estimated by Kriging.The analysis showed that the City＇s average PM2.5concentration was 218 μg/m^3 during heavy smog days that mainly occurred in winter,accounting for 15.9% of the whole year; the land area where the average PM2.5concentration was above 150 μg/m^3 accounting for 82%; and meantime the spatial distribution of PM2.5 during those days was relatively uniform. In addition,wind direction had a significant effect on the spatial distribution of PM2.5during heavy smog days（〉150 μg/m^3）,i.e.,the proportion of land area in condition of south wind was 87%,east wind 81%,west 70% and north wind 66%; and during heavy smog days the major components in PM2.5were NO3-,NH4＋,SO4^2-,the content of them were almost the same under various wind directions,which accounted for 60%-65% of the total PM2.5.

关 键 词：PM2.5 季节分布 空间分布 重污染 北京 

分 类 号：X823[环境科学与工程—环境工程]