Received date: 2008-10-14
Revised date: 2009-03-30
Online published: 2009-09-25
Supported by
Open Fund of Key Laboratory of Regional Climate-Environment Research for Temperate East Asia (RCE-TEA), Chinese Academy of Sciences
Based on the observational data in Xi'an and three other sites surrounding it from 1951 to 2006, this paper analyzes the impact of urbanization on surface air temperature change, including mean surface air temperature (Tm), maximum surface air temperature (Tmax) and minimum surface air temperature (Tmin). To get a better understanding of the influence of urban heat island (UHI) effect on warming trend, we study the differences of Tm, Tmax and Tmin between the city site and the other sites in different periods and at different time scales, respectively. The results show there are distinct seasonal differences in urban heat island effects on Tm trend, and different UHI effects are observed in different time periods. There is little difference in linear trend coefficient in annual mean surface temperature, maximum surface temperature and minimum surface temperature between the city site and the surrounding sites before 1980, and the linear trend coefficients of annual mean surface temperature (Tm), maximum surface temperature (Tmax) and minimum surface temperature (Tmin) at the city station are larger than those of the other three sites after 1980. Especially after 1993, the linear trend coefficients of Tm, Tmax and Tmin in the city are much larger than those of the surrounding sites, and the linear trend coefficient of annual mean Tm is 1.6 to 3.5 times that of the surrounding sites, indicating that the urban heat island effect increases with the increase of both the surface air temperature and the warming rate. We also found that the most significant warming trend occurs at all the four sites in spring, with a rate of 2.20 oC/10a in Xi'an in spring, which is 2-4 times that in the other three seasons, followed by autumn, and the least significant warming occurs in summer. The maximal influence of UHI effect on Tmax is observed in spring, but on Tmin in winter.
Key words： urbanization; urban heat island (UHI); temperature; trend coefficient; Xi’a
GAO Hong-yan,CAI Xin-ling,HE Hao,WANG Li-hua,KOU Xiao-lan,ZHANG Hong . The Impact of Urbanization on the Surface Temperature in Xi'an[J]. Acta Geographica Sinica, 2009 , 64(9) : 1093 -1102 . DOI: 10.11821/xb200909007
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