ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 37 Issue 11 > 2011,37(11):1423-1430. DOI:10.7519/j.issn.1000-0526.2011.11.014 Prev Next
Impact of Hefei Urbanization on Temperature Observation Based on Remote Sensing Data
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Abstract:
Based on the data from Hefei and its surrounding sites and MSS, TM and ETM data of Hefei City, and GIS technology, the land use/cover change (LUCC) situations of buffer areas， which are apart 1, 2.5, 4 km from Hefei observation field and 20 km from Hefei urban areas， were extracted. Variations of annual average, maximum and minimum temperatures (Tave , Tmax and Tmin) were analyzed in Hefei and its surrounding sites, respectively. Furthermore, the regression model between LUCC of Hefei observation field and temperature was established, and a sensitivity analysis was also made. The results have shown that in recent 40 years, the urban area of Hefei has been expanding, thus leading to the site entering into city. Due to this, Hefei Site moved to the suburbs in 1979 and 2004, respectively. After that the temperature difference between Hefei and its surrounding sites became smaller. Because of Hefei Site entering into city, increasing rates of three temperatures in Hefei Site were significantly higher than those in its surrounding sites, and the differences of Tave ,Tmax and Tmin between Hefei and its surrounding sites became bigger. The regression model between LUCC and the temperature in different buffers area showed that impacts of LUCC on Tave ,Tmax and Tmin were not sensitive in Hefei observation field’s 1 and 2.5 km buffer areas. Similarly, impacts of LUCC on Tmax were not sensitive in Hefei observation field’s 4 km buffer area, while impacts of LUCC on Tave and Tmin were significant. Specifically, the increased building areas had a positive contribution to Tave and Tmin in Hefei observation field’s 4 km buffer area; Oppositely, the increased farmland, vegetation, water body areas had a negative effect on Tave and Tmin
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