Journal of Geographical Sciences ›› 2008, Vol. 18 ›› Issue (2): 166-176.doi: 10.1007/s11442-008-0166-6

• Climate and Environmental Change • Previous Articles     Next Articles

Regional features of the temperature trend in China based on Empirical Mode Decomposition

SUN Xian1, LIN Zhenshan2, CHENG Xiaoxia1, JIANG Chuangye1   

  1. 1. Shaanxi Climate Center, Xi’an 710015, China|
    2. The School of Geographic Sciences, Nanjing Normal University, Nanjing 210097, China
  • Received:2007-10-29 Revised:2007-12-10 Online:2008-06-25 Published:2008-06-25
  • Supported by:

    National Natural Science Foundation of China, No.40371044

Abstract:

By the Empirical Mode Decomposition method, we analyzed the observed monthly average temperature in more than 700 stations from 1951–2001 over China. Simultaneously, the temperature variability of each station is calculated by this method, and classification chart of long term trend and temperature variability distributing chart of China are obtained, supported by GIS, 1 km×1 km resolution. The results show that: in recent 50 years, the temperature has increased by more than 0.4℃/10a in most parts of northern China, while in Southwest China and the middle and lower Yangtze Valley, the increase is not significant. The areas with a negative temperature change rate are distributed sporadically in Southwest China. Meanwhile, the temperature data from 1881 to 2001 in nine study regions in China are also analyzed, indicating that in the past 100 years, the temperature has been increasing all the way in Northeast China, North China, South China, Northwest China and Xinjiang and declining in Southwest China. An inverse ‘V-shaped’ trend is also found in Central China. But in Tibet the change is less significant.

Key words: China, temperature, empirical mode decomposition, intrinsic mode function