Aircraft study of Mountain Chimney Effect of Beijing, China
Aircraft study of Mountain Chimney Effect of Beijing, China
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中国北京山地烟囱效应的飞机研究
DOI：
10.1029/2008jd010610
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发表时间：
2009-04
影响因子：
--
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中科院分区：
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[1] 本文利用飞机测量报告了北京地区空气污染物的三维分布，并研究了山区烟囱效应（MCE）对该地区空气污染物分布的影响。 2007年8月18日，北京通过飞机测量观测到了一个显着的两层污染层结构。气态和颗粒污染物在行星边界层中充分混合，浓度很高。海拔2500~3500 m存在高架污染层（EPL），污染物浓度较高，与行星边界层相当。飞机测量分析表明，两个污染层的污染物来源相同。在分析天气研究与预报(WRF)-TRACER模型和风廓线数据的基础上，探讨了EPL的形成。北京地区风流以山谷风为主，对本地区污染物分布具有MCE影响。由于这种效应，空气污染物从行星边界层注入自由对流层。这些污染物随后被偏北风吹回城市上空。从而形成北京上空两层污染层的结构。模拟结果表明，前一天边界层上方污染层的持续存在对污染物的表面浓度有显着贡献。当混合深度增加时，升高的污染物被重新捕获到行星边界层并向下混合。污染物表面浓度的快速增加可能归因于污染物的垂直向下混合。
[1] In this paper, the three-dimensional distribution of air pollutants in the Beijing region using aircraft measurements is reported, and Mountain Chimney Effect (MCE) on the distribution of air pollutants in this region is studied. A remarkable two-pollution-layer structure was observed by aircraft measurement in Beijing on 18 August 2007. Gaseous and particle pollutants were well mixed with high concentrations in the planetary boundary layer. There was an elevated pollution layer (EPL) at the altitude of 2500–3500 m, and the concentrations of pollutants were high and comparable with that in the planetary boundary layer. Analysis of aircraft measurement indicates that pollutants in the two pollution layers originated from the same source. On the basis of analysis of the Weather Research and Forecasting (WRF)-TRACER model and wind profile data, the formation of EPL is discussed. The wind flow of Beijing region was dominated by mountain-valley breeze, which has MCE on the distribution of pollutants in this region. Air pollutants were injected from the planetary boundary layer into the free troposphere due to this effect. These pollutants were subsequently transported back over the city by the elevated northerly wind. Thus the structure of two pollution layers over Beijing is formed. Modeling results show that the persistence of a polluted layer over the boundary layer from the previous day has significant contribution to the surface concentrations of pollutants. When the mixing depth increases, the elevated pollutants are recaptured into planetary boundary layer and mixed downward. The rapid increase of surface concentrations of pollutants may be attributed to the vertical down-mixing of pollutants.
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影响因子：
2
作者：
Chunsheng Zhao;X. Tie;Geli Wang;Yu Qin;Peicai Wang
通讯作者：
Chunsheng Zhao;X. Tie;Geli Wang;Yu Qin;Peicai Wang
影响因子：
5
作者：
Tie, XX;Brasseur, GP;Richter, A
通讯作者：
Richter, A
影响因子：
5
作者：
D. Blumenthal;W. White;T. Smith
通讯作者：
D. Blumenthal;W. White;T. Smith
影响因子：
6.3
作者：
S. Henne;M. Furger;S. Nyeki;M. Steinbacher;B. Neininger;S. Wekker;J. Dommen;N. Spichtinger;A. Stohl;A. Prévôt
通讯作者：
S. Henne;M. Furger;S. Nyeki;M. Steinbacher;B. Neininger;S. Wekker;J. Dommen;N. Spichtinger;A. Stohl;A. Prévôt
影响因子：
5
作者：
Tao Wang;C. Poon;Y. H. Kwok;Yi Li
通讯作者：
Tao Wang;C. Poon;Y. H. Kwok;Yi Li