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2014年10月北京市4次典型空气重污染过程成因分析

程念亮 李云婷 张大伟 陈 添 徐文帅 孙 峰 董 欣

程念亮, 李云婷, 张大伟, 陈 添, 徐文帅, 孙 峰, 董 欣. 2014年10月北京市4次典型空气重污染过程成因分析[J]. 环境科学研究, 2015, 28(2): 163-170.
引用本文: 程念亮, 李云婷, 张大伟, 陈 添, 徐文帅, 孙 峰, 董 欣. 2014年10月北京市4次典型空气重污染过程成因分析[J]. 环境科学研究, 2015, 28(2): 163-170.
CHENG Nianliang, LI Yunting, ZHANG Dawei, CHEN Tian, XU Wenshuai, SUN Feng, DONG Xin. Analysis about the Characteristics and Formation Mechanisms of Serious Pollution Events in October 2014 in Beijing[J]. Research of Environmental Sciences, 2015, 28(2): 163-170.
Citation: CHENG Nianliang, LI Yunting, ZHANG Dawei, CHEN Tian, XU Wenshuai, SUN Feng, DONG Xin. Analysis about the Characteristics and Formation Mechanisms of Serious Pollution Events in October 2014 in Beijing[J]. Research of Environmental Sciences, 2015, 28(2): 163-170.

2014年10月北京市4次典型空气重污染过程成因分析

基金项目: 北京市科技计划课题(Z131100006113009);国家环境保护公益性行业科研专项(201409005)

Analysis about the Characteristics and Formation Mechanisms of Serious Pollution Events in October 2014 in Beijing

  • 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264 μg/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(>200 μg/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154 μg/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.

     

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  • 刊出日期:  2015-02-25

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