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	Impact of urban expansion on meteorological observation data and overestimation to regional air temperature in China
	Shao Q. Q. ; Sun C. Y. ; Liu J. Y. ; He J. F. ; Kuang W. H. ; Tao F. L.
	2011
关键词	urban expansion meteorological stations RS data interpolation urban heat-island intensity air temperature land-use change heat-island climate city
英文摘要	Since the implementation of the reform and opening up policy in China in the late 1970s, some meteorological stations 'entered' cities passively due to urban expansion. Changes in the surface and built environment around the stations have influenced observations of air temperature. When the observational data from urban stations are applied in the interpolation of national or regional scale air temperature dataset, they could lead to overestimation of regional air temperature and inaccurate assessment of warming. In this study, the underlying surface surrounding 756 meteorological stations across China was identified based on remote sensing images over a number of time intervals to distinguish the rural stations that 'entered' into cities. Then, after removing the observational data from these stations which have been influenced by urban expansion, a dataset of background air temperatures was generated by interpolating the observational data from the remaining rural stations. The mean urban heat island effect intensity since 1970 was estimated by comparing the original observational records from urban stations with the background air temperature interpolated. The result shows that urban heat island effect does occur due to urban expansion, with a higher intensity in winter than in other seasons. Then the overestimation of regional air temperature is evaluated by comparing the two kinds of grid datasets of air temperature which are respectively interpolated by all stations' and rural stations' observational data. Spatially, the overestimation is relatively higher in eastern China than in the central part of China; however, both areas exhibit a much higher effect than is observed in western China. We concluded that in the last 40 years the mean temperature in China increased by about 1.58A degrees C, of which about 0.01A degrees C was attributed to urban expansion, with a contribution of up to 0.09A degrees C in the core areas from the overestimation of air temperature.
出处	Journal of Geographical Sciences
卷	21
期	6
页	994-1006
收录类别	SCI
语种	英语
ISSN号	1009-637X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23121]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Shao Q. Q.,Sun C. Y.,Liu J. Y.,et al. Impact of urban expansion on meteorological observation data and overestimation to regional air temperature in China. 2011.

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