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Characteristics of Urban Heat Island Effect and Its Meteorological Influencing Factors Over Beijing in Autumn

LI Xing-Rong1,2,HU Fei1,SHU Wen-Jun3,and Liang Bi-Ling21 State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 1000292 Shenzhen Meteorological Bureau,Shenzhen 5180403 Beijing Climate Center,Beijing Municipal Meteorological Bureau,Beijing 100089  
Based on the data of 20 meteorological stations in Beijing,the characteristics of Beijing autumn urban heat island(UHI)were analyzed.The results show that the Beijing autumn UHI in the evening is stronger than that in the daytime.In addition,with the data got by three automatic meteorological stations and the 325 m meteorological tower of LAPC,the characteristics and its meteorological influencing factors of a strong UHI and a weak one were analyzed contrastively.The strong UHI occurs in the evening under some specific conditions,but it weakens and disappears in the daytime,the diurnal variation of the strong UHI is very obvious.And the cooling rate and extent of the suburban surface atmosphere is bigger than those of the urban surface atmosphere after sunset,which directly leads to the formation of the strong UHI.The heating rate and extent of the suburban surface atmosphere is bigger than those of the urban surface atmosphere after sunrise,which directly causes the weakening and disappearance of the strong UHI.In the clear evening of the sunny day,the surface winds maintain weak(≤ 1.0 m·s-1) over the suburb and urban areas,the wind below 47 m over urban area maintains weak(≤1.0 m·s-1) too,and the strong inversion temperature in the atmosphere layer below 320 m over urban area occurs and maintains all the night,all of these have important effects on the formation and maintenance of the autumn strong UHI.In the daytime the solar radiation has the most important effects on the weakening and disappearance of the strong UHI,it makes the suburban surface atmosphere temperature rise faster and more than the urban atmosphere temperature,and also the strong inversion temperature disappear,and further the strong UHI weaken and disappear in the end after about 1000 LST.
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