Study of Mountain Chimney Effect of Beijing,China
会议名称：《第十届全国气溶胶会议暨第六届海峡两岸气溶胶技术研讨会》
会议日期：2009年
学科分类：07[理学] 070602[理学-大气物理学与大气环境] 0706[理学-大气科学]
摘 要：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 *** and particle pollutants were well mixed with high concentrations in the planetary boundary *** 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 *** of aircraft measurement indicates that pollutants in the two pollution layers originated from the same *** the basis of analysis of the Weather Research and Forecasting（WRF）-TRACER model and wind profile data,the formation of EPL is *** wind flow of Beijing region was dominated by mountain-valley breeze,which has MCE on the distribution of pollutants in this *** pollutants were injected from the planetary boundary layer into the free troposphere due to this *** pollutants were subsequently transported back over the city by the elevated northerly *** the structure of two pollution layers over Beijing is *** 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 *** the mixing depth increases,the elevated pollutants are recaptured into planetary boundary layer and mixed *** rapid increase of surface concentrations of pollutants may be attributed to the vertical down-mixing of pollutants.