气流输送对北京大气污染物体积分数的影响
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国家重点基础研究发展规划项目(2009CB426313);教育部博士点基金(20093228110003);中国博士后科学基金资助(20090450560)


The impact of air transport pathways on pollutant concentrations in Beijing
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    摘要:

    利用HYSPLIT后向轨迹模式和2004年8月—2007年12月NCEP再分析气象资料,计算每天15:00抵达北京地区10、100和500m高度上的后向气流轨迹.对整个研究时段、采暖季和非采暖季期间的后向气流轨迹分别进行聚类分析,得到这3个时段到达北京地区的主要后向气流轨迹聚类.其中整个研究时段的后向气流轨迹分成3个聚类,采暖季和非采暖季的后向气流轨迹都分成5个聚类.结合各段时间中国科学院大气物理研究所观测的大气污染物体积分数资料,分析不同时段气流输送作用对北京主要大气污染物体积分数的影响.发现采暖季和非采暖季北京气体污染物体积分数高值主要集中在来自风速较小的西北方气流聚类.采暖季污染物体积分数低值主要出现在偏北方向风速较大的后向气流轨迹聚类.非采暖季污染物体积分数低值主要出现在偏北低速气流聚类和西北向高速气流轨迹聚类中.从各时段污染物最值分布情况可以看出:在风速较大的后向气流轨迹聚类影响下,北京的污染物体积分数较低;途经了较严重工业排放地带的后向气流轨迹聚类会使北京气体污染物体积分数显著增高.此外,虽然非采暖季的大气污染物分布与气流输送的影响基本符合,但各聚类污染物分布结果与气流输送作用的影响存在偏差.

    Abstract:

    Using the HYbrid Single-Particle Lagrangian Integrated Trajectory(HYSPLIT) model,three cluster analysis of 96 h back trajectories for August 2004 to December 2001 arriving at 15:00 pm in Beijing at three different arrival heights of 10,100 and 500 m have been performed in order to better understand the impact of air transport pathways on urban air pollutant concentrations in cold and warm seasons.Three natural synoptic scale transport patterns were identified with westerly,strong-westerly and slow-easterly from August of 2004 to December of 2007.And five synoptic scale transport patterns were identified during cold seasons and warm seasons.With observational data taken from an urban site of Institute of Atmospheric physics,the impact of each transport pattern on air pollutant concentrations in Beijing were analyzed.The results show high atmospheric pollutant concentrations of both cold and warm seasons always appear in slow-northwestern pathways,the low pollutant concentrations of cold seasons appear in strong-northerly pathways and that of warm seasons appear in both slow-northerly pathways and strong-northwestern pathways.The analytic results indicate low pollutant concentration always appear in long-range transport pattern as the fast wind speed and air pathways from heavy polluted industrial region tend to increase the urban pollutant concentration in Beijing.The bias between the air transport pathway effect and the pollutant concentration distribution in warm seasons indicates that more study are needed on other potential factors effecting urban atmospheric pollutants.

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陈旭,安俊琳,刘世玺.气流输送对北京大气污染物体积分数的影响[J].南京信息工程大学学报(自然科学版),2012,4(1):47-56
CHEN Xu, AN Junlin, LIU Shixi. The impact of air transport pathways on pollutant concentrations in Beijing[J]. Journal of Nanjing University of Information Science & Technology, 2012,4(1):47-56

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  • 收稿日期:2011-01-23
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