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Impacts of land-cover types on an urban heat island in Hangzhou, China

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This research examined the impact of urban land-cover types on the urban heat island (UHI) in Hangzhou, China. Air temperatures (T air) measured at a height of 1.5┬ám at times 00:00, 10:00, 14:00, and 18:00 were used for atmospheric urban heat island (AUHI) analysis. Data from the Environmental and Disaster Monitoring and Forecasting Satellite B (HJ-1B) were utilized to retrieve land surface temperature (LST) for surface urban heat island (SUHI) analysis and to map land-cover distribution. Pearson correlation and partial correlation analyses were performed to investigate the impacts of land-cover types on T air, LST, and the relationship between T air and LST. The results show that (1) LST and night-time T air are sensitive to the amount of impervious surface and vegetation and (2) land-cover types did not significantly influence the correlation between LST and T air at 10:00, but the amount of impervious surface and vegetation had significant impact at 0:00. This research indicates that the percentage of impervious surface is a good indicator for LST and night-time T air, and for relating night-time AUHI to satellite-based observations of SUHI. This research also proposed a new method that considers both temperature patterns and land-cover types to explain the spatial variations in AUHI and a new indicator – cooling-distance rate – to help people to select a suitable living place when both work–home distance and work–home temperature difference are factors that they wish to consider.
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Document Type: Research Article

Affiliations: 1: Institute of Digital Agriculture, Zhejiang Academy of Agriculture Sciences, Hangzhou, Zhejiang, 310021, China 2: Zhejiang Provincial Key Laboratory of Carbon Cycling in Forest Ecosystems and Carbon Sequestration, School of Environmental and Resource Sciences, Zhejiang Agriculture and Forest University, Lin’an, Zhejiang, 311300, China 3: Institute of Agricultural Remote Sensing and Information Application, College of Environment and Resources Science, Zhejiang University, Hangzhou, Zhejiang, 310058, China

Publication date: March 19, 2015

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