Relationships between Urban Heat Island Effect and Land Use and Land Cover Change around Urban Weather Stations
LIU Ke1,2,3, GU Xingfa1,2, YU Tao1,2, GAO Zhiqiang4, GAO Wei5, and LIU Chaoshun5 1State Key Laboratory of Remote Sensing Science, Jointly Sponsored by Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, Beijing100101 2Center for National Spaceborne Demonstration, Beijing100101 3School of Geography and Tourism, Chongqing Normal University, Chongqing400047 4Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing100101 5Key Laboratory of Geo-information Science of the Ministry of Education, East China Normal University, Shanghai200062
Based on the Landsat TM remote sensing images from 1990 to 2006, the relationship between different types of underlying surfaces and Urban Heat Island (UHI) by analyzing various underlying surfaces from different radius circular buffer zones (with Hefei Weather Station as their center) and their corresponding air temperatures (annual average temperaeure, maximum temperaeure,minimum temperaeure, and fixed time data). It is found that a very strong positive correlation between construction land and UHI and a negative correlation between woodland/grassland and UHI. There is a relatively strong positive correlation between water body and UHI at night. The influence of different types of underlying surfaces on UHI varies with different hours everyday. As far as range of influence is concerned, construction land is within 6 km; woodland/grassland is within 4 km; farmland influence reaches its peak at 4 km; influence of water body reaches 8 km slowly. At the same time, through analyzing the relationship between yearly Land Use and Land Cover Change (LUCC) and UHI, the authors give more evidence of the vital effect laid by city development on UHI. There is a relatively strong correlation between the maximum temperature and the annual variation of heat island intensity at 1400 LST and the yearly variation of LUCC. By the way, UHI decreases dramatically after the moving out of Hefei Weather Station. At last, the possible reasons for how the correlation between different underlying surfaces and UHI can be formed are discussed.