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Changes in the spatial scale of beijing UHI and urban development

Science china Earth sciences 2005年第Z2期48卷 116-127页

作者： yu shuqiu, bian lingen & lin xuechun state key laboratory on severe weather, chinese academy of meteorological sciences, beijing 100081, china National Climate Center, china meteorological Administration, beijing 100081, china state key laboratory on severe weather Chinese Academy of Meteorological Sciences Beijing 100081 China National Climate Center China Meteorological Administration Beijing 100081 China

The seasonal and interannual variations of beijing urban heat island (UHI) are investigated in this paper using the temperature data from 1960 to 2000 at 20 meteorological stations in the beijing region, and then the relationship between the intensity and spatial scale of UHI and beijing urbanization indices is analyzed and discussed. Main conclusions are the followings. First, beijing UHI shows obvious seasonal variations, and it is strongest in winter, next in spring and autumn, and least in summer. The seasonal variation of the UHI mainly occurs in the urban area. The UHI intensity at the center of beijing is more than 0.8℃ in winter, and only 0.5℃ in summer. Second, the intensity of beijing HUI exhibits a clear interannual warming trend with its mean growth rate (MGR) being 0.3088℃/10 a. The MGR of HUI is largest in winter, next in spring and autumn, and least in summer, and the urban temperature increase makes a major contribution to the growth of HUI intensity. Third, since the Reform and Opening, the urbanization indices have grown several ten times or even one hundred times, the intensity of HUI has increased dramatically, and its spatial scale also expanded distinctively along with the expansion of urban architectural complexes. Fourth, the interannual variation of urbanization indices is very similar with that of HUI intensity, and their linear correlation coefficients are significant at a more than 0.001 confidence level.

关键词： beijing region, temperature change, heat island effect, HUI spatial scale, human activities.

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