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2007—2014年北京地区PM2.5质量浓度变化特征

王浩 高健 李慧 王涵 李轶 王淑兰 柴发合

王浩, 高健, 李慧, 王涵, 李轶, 王淑兰, 柴发合. 2007—2014年北京地区PM2.5质量浓度变化特征[J]. 环境科学研究, 2016, 29(6): 783-790.
引用本文: 王浩, 高健, 李慧, 王涵, 李轶, 王淑兰, 柴发合. 2007—2014年北京地区PM2.5质量浓度变化特征[J]. 环境科学研究, 2016, 29(6): 783-790.
WANG Hao, GAO Jian, LI Hui, WANG Han, LI Yi, WANG Shulan, CHAI Fahe. Variation of PM2.5 Mass Concentration in Beijing Area during 2007-2014[J]. Research of Environmental Sciences, 2016, 29(6): 783-790.
Citation: WANG Hao, GAO Jian, LI Hui, WANG Han, LI Yi, WANG Shulan, CHAI Fahe. Variation of PM2.5 Mass Concentration in Beijing Area during 2007-2014[J]. Research of Environmental Sciences, 2016, 29(6): 783-790.

2007—2014年北京地区PM2.5质量浓度变化特征

基金项目: 国家自然科学基金项目(41375132,6);北京市科技计划项目(Z131100006113013)

Variation of PM2.5 Mass Concentration in Beijing Area during 2007-2014

  • 摘要: 为更好地解析北京地区ρ(PM2.5)的长期变化特征及气流轨迹聚类分析结果,对2007年8月—2014年7月在中国环境科学研究院实测的ρ(PM2.5)数据进行了统计分析,分析其年际、季节和月际变化特征;通过计算PM2.5的AQI分指数,分析了污染等级的时间变化特征;结合后向气流轨迹,对ρ(PM2.5)年际、季节变化与气团来源的关系进行了分析.结果表明:北京地区2008—2013年ρ(PM2.5)年均值分别为111.5、95.8、94.8、80.5、75.2、81.3 μg/m3,整体呈逐年下降趋势,但污染水平依然较高;ρ(PM2.5)由高到低的季节次序为秋季、冬季、春季、夏季,平均值分别为111.6、94.8、77.2、70.5 μg/m3,PM2.5重污染时段主要出现在秋冬季节,并且冬季ρ(PM2.5)近年来逐渐呈上升趋势;ρ(PM2.5)月均值呈单峰型变化,11月最高(为125.3 μg/m3),7月最低(为76.4 μg/m3);轨迹聚类分析发现,途经山西省北部和河北省南部的气流轨迹中ρ(PM2.5)较高,而来自北方及西北方向的气团相对较清洁,ρ(PM2.5)较低.北京地区近些年实施的大气污染减排措施对于控制PM2.5污染取得了一定效果,但针对秋冬季节重污染过程的控制力度仍需要加强,同时也要注意区域污染传输对北京地区ρ(PM2.5)的影响.

     

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出版历程
  • 收稿日期:  2015-11-18
  • 修回日期:  2016-03-23
  • 刊出日期:  2016-06-25

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