Acta Geographica Sinica ›› 2011, Vol. 66 ›› Issue (7): 905-916.doi: 10.11821/xb201107004

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Spatial Distribution and Temporal Trends in Potential Evaporation over Hengduan Mountains Region from 1960 to 2009

ZHU Guofeng1, HE Yuanqing1,2, PU Tao2, LI Zongxing1, WANG Xufeng1, JIAWenxiong3, XIN Huijuan1   

  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. Research School of Arid Environment and Climate Change, Lanzhou university, Lanzhou 730000, China;
    3. College of Geography and Environment Science of Northwest Normal University, Lanzhou 730070, China
  • Received:2011-03-28 Revised:2011-05-09 Online:2011-07-20 Published:2011-07-20
  • Supported by:

    National Natural Science Foundation of China, No.40971019; National Basic Research Program of China,No.2007CB411501; Project for Incubation of Specialists in Glaciology and Geocryology of National Natural Science Foundation of China, No.J0630966; the Foundation from The State Key Laboratory of Cryosphere Science; West Light Foundation of China's Academy of Sciences, No.O828A11001; The CAS Special Grant for Postgraduate Research, Innovation and Practice; National Natural Science Foundation of China, No.90511007; No.40801028

Abstract: In this paper, annual and seasonal changes of potential evaporation were analyzed to conduct studies on hydrological model and ecological environment based on climate data at 20 meteorological stations in the Hengduan Mountains region during 1960-2009, in combination of the Penman-Monteith model. The changing trend in potential evaporation over the Hengduan Mountains is analyzed in this study. With the method of Spline under ArcGIS, the spatial distribution of potential evaporation is presented to research the regional difference. And the correlation analysis is used to discuss the dominant factor affecting the potential evaporation. The results indicate that the annual potential evaporation showed a decreasing tendency since the 1960s, especially from the 1980s to the 1990s, while it showed an increasing tendency since 2000. Regional potential evaporation showed a rate of -0.17 mm a-1. The potential evaporation in north, middle and south of Hengduan Mountains exhibited decreasing trends over the studied period, and its regional trend was on the decline from the southwest to the northeast.

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