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Numerical simulation of the influence of aerosol radiation effect on urban boundary layer

查看全文 作　　者：Xinran [1,2]WANG;Xiaodong [2]HE;Shiguang [2]MIAO;Youjun [2]DOU 高影响力作者 机构地区：[1]China Institute of Atomic Energy,Beo'ing 102413,China;[2]Institute of Urban Meteorology,China Meteorological Administration,Beijing 100089,China高影响力机构 出　　处：《Science China Earth Sciences》索引2018年第61卷第12期,共15页高影响力期刊 基　　金：supported by the Ministry of Science and Technology of China (Grant No. 2015DFA20870);the Beijing Municipal Science and Technology Commission (Grant Nos. D171100000717003, Z161100001116065 & Z151100002115045) 摘　　要：With the intensification of pollution and urbanization, the aerosol radiation effect continues to play an important role in the urban boundary layer. In this paper, a winter pollution process in Beijing has been taken as an example, and a new aerosol vertical profile in the radiative parameterization scheme within the Weather Forecast Research and Forecasting(WRF) model has been updated to study the effect of aerosols on radiation and the boundary layer. Furthermore, the interactions among aerosols,urbanization, and planetary boundary layer(PBL) meteorology were discussed through a series of numerical experiments. The results show the following:(1) The optimization improves the performance of the model in simulating the distribution features of air temperature, humidity, and wind in Beijing.(2) The aerosols reduce the surface temperature by reducing solar radiation and increasing the temperature in the upper layer by absorbing or backscattering solar radiation. The changes in the PBL temperature lead to more stable atmospheric stratification, reducing the energy transfer from the surface and the height of the boundary layer.(3) With the increase in the aerosol optical depth, the atmospheric stratification most likely becomes stable over rural areas, most likely becomes stable over suburb areas, and has great difficultly becoming stable over urban areas. Aerosol radiative forcing,underlying urban surfaces, and the interaction between them are the main factors that affect the changes in the meteorological elements in the PBL. 关 键 词：AEROSOL URBANIZATION BOUNDARY layer METEOROLOGICAL ELEMENTS WRF
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