Based on analysis of the relation between various underlying surfaces intercepted from the different-radius circular buffer zones (the radius is respectively 1, 2, 3km, with 11 Shanghai meteorological stations as their center) and their corresponding air temperatures (four times per day, 2 a.m., 8 a.m., 2 p.m., and 8 p.m. (LST)). It is found that a positive correlation between urban land and UHI, and a strong negative correlation between vegetation and UHI. Urban land and vegetation within the range of 1 km around the station affected the observed air temperature from the station. The cooling effect of vegetation within the range of 2 km could not be ignored, whereas that within 3 km was not obvious. The effect of land use on air temperature was most remarkable at 8 p.m., followed by 2 a.m. The effect was not obvious at 8 a.m., and weak effect was observed at 2 p.m. At last, it is mainly discussed the possible reasons for how the correlation between different underlying surfaces and UHI can be formed.
This paper was based on the 2005 general weather information of 11 Shanghai meteorological stations four times per day, and the 2005 MODIS LST data of Shanghai region at the nearly same time, analyzed the difference on UHI around the meteorological stations, under an ideal meteorological condition. The analysis shows the air temperature and LST was spatially identical to those that were observed in the core zone of Shanghai, with only a small difference in scope and range, but the lowest temperatures exhibited regional variations.
Three regions, Huaibei, Jianghuai, Jiangnan, are divided based on the topography, climatic
characteristics, as well as surface temperature from 1957 to 2006 of 16 stations in Anhui province. The
change with the year, season and month is analyzed in Anhui province and three areas. Some
conclusions are as follows. Anhui province had the lowest temperature in 1980s, but after that the
temperature raised step by step. The warming fastest region is Jianghuai. The same pace of warming is
in three areas: the greatest warming in spring, then that in autumn, the last in summer. It is warming
remarkable in February and the cooling time occurs in July and December. But the fluctuation in three
areas is different in some details. The heat island in Hefei is also researched. It suggests that the urban
heat island intensity in 1990s in Hefei was the maximum, and then weakened. At the meanwhile, the
summer is cooling and the winter is warming in Hefei.