中国城市扩展对气温观测的影响及其高估程度(英文)

编号 zgly0001585648

文献类型 期刊论文

文献题名 中国城市扩展对气温观测的影响及其高估程度(英文)

作者 邵全琴  孙朝阳  刘纪远  何剑锋  匡文慧  陶福禄 

作者单位 DivisionofRegionalEnvironmentalChangeResearch  InstituteofGeographicSciencesandNaturalResourcesResearch  CAS  GraduateUniversityofChineseAcademyofSciences  NationalClimateCenter  ChineseMeteorologicalAdministration 

母体文献 Journal of Geographical Sciences 

年卷期 2011年06期

年份 2011 

分类号 P412.11 

关键词 urbanexpansion  meteorologicalstations  RS  datainterpolation  urbanheat-islandintensity  air 

文摘内容 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 1.58℃, of which about 0.01℃ was attributed to urban expansion, with a contribution of up to 0.09℃ in the core areas from the overestimation of air temperature.