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气象:2017,43(7):813-822
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京津冀地区冬半年污染传输特征及传输指数的改进
花丛,刘,超,张恒德,江琪
(国家气象中心,北京 100081)
Characteristics of Air Pollutant Transport over Beijing Tianjin Hebei Region During Winter Months and Improvement of Transport Weather Index
HUA Cong,LIU Chao,ZHANG Hengde,JIANG Qi
(National Meteorological Centre, Beijing 100081)
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投稿时间:2016-12-06    修订日期:2017-04-20
中文摘要: 文章通过轨迹聚类、潜在源区分析等方法对京津冀地区冬半年污染物传输特征进行了分析,在此基础上对传输指数的构建方法进行了改进,并结合一次重污染天气过程分析了其作用。结果表明,对于北京、天津和石家庄,其重污染轨迹出现概率从高到低均为偏南路径、偏西路径、偏东路径和西北路径;在近地面高度上,西南和东南风的增强在大多时候成为北京的污染物传输通道,其中东南方向的污染物来源主要集中在大气低层;改进后的传输指数能够更好地反映外来传输作用对本地污染物浓度的影响,京津冀及周边地区的传输作用对北京、天津和石家庄等大城市的污染物浓度影响较明显,其中城郊及周边地区的近距离传输影响最为显著;合理应用传输指数可以对重污染天气的成因进行初步判断。
Abstract:Trajectory clustering analysis and potential source contribution function (PSCF) analysis are applied for the characteristics of air pollutant transport in China’s Beijing Tianjin Hebei Region during winter months, and the construction of transport index is improved. On this basis, a heavy air pollution process is used to investigate the effect of transport index. The results show that the probabilities of heavy pollution weather with air masses coming from south, west, east and northwest direction are descending for Beijing, Tianjin and Shijiazhuang. In the surface level, the enhancement of southwesterly and southeasterly wind becomes the main path of air pollutants to Beijing in most time, and the southeastern source of pollutants are mainly concentrated in the lower atmosphere. The improved transport index has a better ability to describe the relationships between air pollutant transports and local PM2.5 concentration. The inter regional transport has an obvious influence on the PM2.5 concentration in Beijing, Tianjin and Shijiazhuang, and short distant transport from suburbs and surrounding areas has the most significant impact. Therefore, a reasonable application of transport index is useful in making a preliminary judgment on the causes of heavily polluted weather.
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基金项目:气象预报预测业务与科研结合专项(CMAHX20160601)、科技部国家重点研发计划项目(2016YFC0203301)和国家科技支撑计划项目(2014BAC16B02)共同资助
引用文本:
花丛,刘超,张恒德,江琪,2017.京津冀地区冬半年污染传输特征及传输指数的改进[J].气象,43(7):813-822.
HUA Cong,LIU Chao,ZHANG Hengde,JIANG Qi,2017.Characteristics of Air Pollutant Transport over Beijing Tianjin Hebei Region During Winter Months and Improvement of Transport Weather Index[J].METEOROLOGICAL MONTHLY,43(7):813-822.