Spatial distribution and temporal trends in potential evapotranspiration over Hengduan Mountains region from 1960 to 2009 |
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| Authors: | ZHU Guofeng HE Yuanqing PU Tao WANG Xufeng JIA Wenxiong LI Zongxing XIN Huijuan |
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| Institution: | 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 |
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| 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. |
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| Keywords: | potential evapotranspiration Spline interpolation Penman-Monteith model spatial and temporal variations Hengduan Mountains |
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