2014年10月北京市4次典型空气重污染过程成因分析

被引:81
作者
程念亮 [1 ]
李云婷 [1 ]
张大伟 [1 ]
陈添 [2 ]
徐文帅 [1 ]
孙峰 [1 ]
董欣 [1 ]
机构
[1] 北京市环境保护监测中心
[2] 北京市环境保护局
关键词
重污染; 成因; 逆温; 区域输送;
D O I
10.13198/j.issn.1001-6929.2015.02.01
中图分类号
X51 [大气污染及其防治];
学科分类号
0706 ; 070602 ;
摘要
采用数值模拟与观测资料相结合的方式,对2014年10月北京市4次典型空气重污染过程的大气环境背景、气象条件和形成原因进行了分析.结果表明,京津冀区域稳定的气象条件是形成空气重污染的主要原因,4次重污染过程大气条件均不利于污染物扩散,表现为大气层结稳定,近地层逆温(平均逆温强度为2.26℃/100 m)明显,风速(平均值为1.52 m/s)小,相对湿度(平均值为80.75%)大.在4次重污染过程中8—11日污染最重,ρ(PM2.5)日均值平均为264μg/m3,并且区域输送对北京贡献率最大,平均值为63.75%;24—25日污染程度次之,逆温最强,逆温强度达5.94℃/100 m;18—20日重污染中北京ρ(PM2.5)高值(>200μg/m3)区主要集中在该市西北部地区;30—31日污染相对较轻,ρ(PM2.5)日均值最高只有154μg/m3.数值模拟表明,在4次典型重污染过程中,来自南方(包括河北、河南和山西西部等地)的外来污染物输送对北京PM2.5贡献较大,外来贡献率分别在42.36%69.12%之间,同时北京本地也存在较强的二次无机盐及有机物转化过程.
引用
收藏
页码:163 / 170
页数:8
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