期刊
ENVIRONMENTAL POLLUTION
卷 208, 期 -, 页码 118-124出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2015.07.037
关键词
Urban heat island (UHI); Definition of UHI; Urban expansion; Mapping urban extent; Concurrency of data
资金
- National Natural Science Foundation of China [31321061, 41071050]
- 111 Project [B14001]
Urban heat island (UHI) can generate profound impacts on socioeconomics, human life, and the environment. Most previous studies have estimated UHI intensity using outdated urban extent maps to define urban and its surrounding areas, and the impacts of urban boundary expansion have never been quantified. Here, we assess the possible biases in UHI intensity estimates induced by outdated urban boundary maps using MODIS Land surface temperature (LST) data from 2009 to 2011 for China's 32 major cities, in combination with the urban boundaries generated from urban extent maps of the years 2000, 2005 and 2010. Our results suggest that it is critical to use concurrent urban extent and LST maps to estimate UHI at the city and national levels. Specific definition of UHI matters for the direction and magnitude of potential biases in estimating UHI intensity using outdated urban extent maps. (C) 2015 Elsevier Ltd. All rights reserved.
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