Journal of Geographical Sciences ›› 2012, Vol. 22 ›› Issue (1): 71-85 .doi: 10.1007/s11442-012-0912-7

• Climate and Environmental Change • Previous Articles     Next Articles

Spatial distribution and temporal trends in potential evapotranspiration over Hengduan Mountains region from 1960 to 2009

ZHU Guofeng1,2, HE Yuanqing1,3, PU Tao3, WANG Xufeng1,2, JIA Wenxiong4, LI Zongxing1,2, XIN Huijuan1,2   

  1. 1. State Key Laboratory of Cryosphere Sciences, Yulong Snow Mountain Glaciers and Environmental Observation Station, Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000, China;
    2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China;
    4. College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China
  • Received:2011-08-01 Revised:2011-09-28 Online:2012-02-15 Published:2011-12-26
  • Supported by:

    National Basic Research Program of China, No.2010CB951404; National Natural Science Foundation of China (NSFC), No.40971019; No.90511007; No.40801028; National Basic Research Program of China, No.2007CB411501; NSFC, No.J0630966; Major Directionality Program of the Chinese Academy of Sciences, No.KZCXZ-YW-317; West Light Foundation of the Chinese Academy of Sciences, No.O828A11001

Abstract:

Based on the meteorological data of 20 stations in the Hengduan Mountains region during 1961-2009, the annual and seasonal variation of potential evapotranspiration was analyzed in combination with the Penman-Monteith model. With the method of Spline interpolation under ArcGIS, the spatial distribution of potential evapotranspiration was presented to research the regional difference, and the correlation analysis was used to discuss the dominant factor affecting the potential evapotranspiration. The results indicated that the annual potential evapotranspiration showed a decreasing tendency since the 1960s, especially from the 1980s to 1990s, while it showed an increasing tendency since 2000. Regional potential evapotranspiration showed a rate of -0.17 mm a-1. Potential evapotranspiration in north, middle and south of the Hengduan Mountains exhibited decreasing trends over the studied period, and its regional trend was on the decline from southwest to northeast.

Key words: potential evapotranspiration, Spline interpolation, Penman-Monteith model, spatial and temporal variations, Hengduan Mountains