Assessment of surface air warming in northeast China, with emphasis on the impacts of urbanization
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Based on homogenized land surface air temperature (SAT) data (derived from China Homogenized Historical Temperature (CHHT) 1.0), the warming trends over Northeast China are detected in this paper, and the impacts of urban heat islands (UHIs) evaluated. Results show that this region is undergoing rapid warming: the trends of annual mean minimum temperature (MMIT), mean temperature (MT), and mean maximum temperature (MMAT) are 0.40 C decade−1, 0.32 C decade−1, and 0.23 C decade−1, respectively. Regional average temperature series built with these networks including and excluding “typical urban stations” are compared for the periods of 1954–2005. Although impacts of UHIs on the absolute annual and seasonal temperature are identified, UHI contributions to the long-term trends are less than 10% of the regional total warming during the period. The large warming trend during the period is due to a regime shift in around 1988, which accounted for about 51% of the regional warming.
KeywordsUrban Heat Island Warming Trend Urban Heat Island Effect China Meteorological Administration Mean Temperature
This paper has been supported by the National Natural Science Foundation of China (grant 40605021), National Key Technology R&D Program (2007BAC29B01-01) and the Ministry of Science and Technology of China through the based platforms special project of scientific data sharing system (grant 2005DKA31700-01). The corresponding author would like to thank David Parker for many constructive suggestions during the corresponding author's visit to the Met Office Hadley Centre. Phil Jones has been supported by the U.S. Department of Energy (grant DE-FG02-98ER62601).
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