JOURNAL OF NATURAL RESOURCES ›› 2017, Vol. 32 ›› Issue (5): 814-828.doi: 10.11849/zrzyxb.20160575

• Resource Evaluation • Previous Articles     Next Articles

Effect of Urbanization on Spatial and Temporal Variation of Extreme Temperature Events in the Yangtze River Delta

JIA Yan-qing1,2, ZHANG Bo1, ZHANG Yao-zong1, TANG Min1, MA Bin1, WANG Guo-qiang1, LIU Xiu-li2, LUO Zheng-ming2   

  1. 1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China;
    2. Department of Geography, Xinzhou Normal University, Xinzhou 034000, China
  • Received:2016-06-02 Revised:2016-08-26 Online:2017-05-20 Published:2017-05-20
  • Supported by:
    National Natural Science Foundation of China, No.41561024; Specialized Research Fund for the Doctoral Program of Higher Education, No.20136203110002; Philosophy Social Science Research Project of Shanxi Colleges and Universities, No.2015265

Abstract: The research analyzes the urbanization effect on spatial and temporal trends of indices of extreme temperature using daily maximum and minimum temperature at meteorological stations in big cities, general cities and villages in the Yangtze River Delta region from 1960 to 2014. The results show that the extreme warm indices increased, while the extreme cold indices decreased. There are slight increasing trends of extreme temperature indices. The warm indices increased more distinctly at urban stations than at rural stations, and the cold indices decreased more apparently at urban stations than at rural stations. The tendencies of other extreme value indices have little difference between urban stations and rural stations except for the minimum value of monthly minimum temperature. Urbanization caused significant decreases of ice days (-0.37 d/10 a), frost days (-1.53 d/10 a) and cold days (-1.05 d/10 a) and significant increases of warm days (1.26 d/10 a), the minimum value of monthly minimum temperature (0.15 ℃/10 a) and the maximum value of monthly minimum temperature (0.06 ℃/10 a) in big cities. The urbanization effect on the trends of ice days (-0.29 d/10 a), frost days (-1.27 d/10 a) and the minimum value of monthly minimum temperature (0.12 ℃/10 a) is significant in general cities. The effect of urbanization on extreme temperature indices is evident in the northern Yangtze River Delta, the southern Jiangsu and southeast Zhejiang. The effect of urbanization on the trend of cold days is more significant in winter, and on the trend of warm days (nights) is more significant in summer. The effect of urbanization on the trends of extreme value indices are significant in spring, summer and winter.

Key words: urbanization, Yangtze River Delta, extreme temperature indices

CLC Number: 

  • P467