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气象:2018,44(11):1489-1500
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2013—2016年北京朝阳站PM2.5质量浓度变化特征
贾小芳,颜鹏,董璠,张晓春,李杨,郭伟
(中国气象局气象探测中心,北京 100081; 中国气象局京津冀环境气象预报预警中心,北京 100089)
Variations of PM2.5 Mass Concentration at Chaoyang Site in Beijing During 2013-2016
JIA Xiaofang,YAN Peng,DONG Fan,ZHANG Xiaochun,LI Yang,GUO Wei
(Meteorological Observation Centre, CMA, Beijing 100081; Environmental Meteorological Forecast Centre of Beijing Tianjin Hebei, CMA, Beijing 100089)
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投稿时间:2017-06-08    修订日期:2018-09-18
中文摘要: 利用2013年2月至2016年1月北京朝阳环境气象站PM2.5质量浓度和同步地面风数据,重点分析了PM2.5质量浓度的变化特征及受地面风的影响情况。观测期间测点PM2.5年平均质量浓度为80.6±4.0 μg·m-3,为环境空气质量标准(GB3095—2012)二级年均浓度限值(35 μg·m-3)的约2.3倍,季节变化特征明显,冬季最高(115.1 μg·m-3)、夏季最低(58.5 μg·m-3)。测点主导风向为ENE—E—ESE,风速主要集中在0.2~2.0 m·s-1。当地面风来自ENE—E—ESE方向时PM2.5质量浓度最高(109.1 μg·m-3),来自WNW—NW—NNW方向时最低(39.5 μg·m-3)。PM2.5质量浓度随风速增大先上升后下降,在0.4 m·s-1时达最高,为139.2 μg·m-3。风速在0.2~2.0 m·s-1时主要受ENE—E—ESE方向影响,而2~6 m·s-1时主要受ESE方向影响较大。通过与其他站点的比较发现,不同站点各方向污染源和地面风的差异导致了PM2.5质量浓度在各方向分布的差异。
Abstract:Using the PM2.5 mass concentration and surface wind data from February 2013 to January 2016 at Chaoyang Environmental Meteorological Station in Beijing, the characteristics of PM2.5 and its influence by surface wind are analyzed. The results show that the annual concentration of PM2.5 is 80.6±4.0 μg·m-3, 2.3 times the annual concentration limits (35 μg·m-3) regulated in the ambient air quality standard (GB3095-2012) of China. Its seasonal variation is obvious with the highest concentration in winter (115.1 μg·m-3) and the lowest in summer (58.5 μg·m-3). The dominant wind direction at Chaoyang Site in Beijing is ENE-E-ESE, and the wind speed ranges between 0.2-2.0 m·s-1. The concentration is the highest (109.1 μg·m-3) in the dominant ENE-E-ESE wind direction and the lowest (39.5 μg·m-3) in WNW-NW-NNW. With the increase of wind speed, PM2.5 concentration increases first and then decreases. The highest concentration (139.2 μg·m-3) appears at the wind speed of 0.4 m·s-1. When the wind speed is in 0.2-2.0 m·s-1, the concentration is mainly affected by ENE-E-ESE, and when the wind speed is 2-6 m·s-1, the value is influenced by ESE more. By comparing with the PM2.5 data from other sites, we found that the different characteristics of pollution sources and ground winds result in the difference of PM2.5 mass concentration in different wind directions.
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基金项目:国家自然科学基金重点项目(91644223)、国家自然科学基金面上项目(21377165和21777191)及中国气象局气象探测中心青年基金(MOCQNJJ201408)共同资助
引用文本:
贾小芳,颜鹏,董璠,张晓春,李杨,郭伟,2018.2013—2016年北京朝阳站PM2.5质量浓度变化特征[J].气象,44(11):1489-1500.
JIA Xiaofang,YAN Peng,DONG Fan,ZHANG Xiaochun,LI Yang,GUO Wei,2018.Variations of PM2.5 Mass Concentration at Chaoyang Site in Beijing During 2013-2016[J].Meteor Mon,44(11):1489-1500.