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| 青藏高原蒸发皿蒸发量时空变化特征及其成因的定量分析(英文) | |
| 引用本文： | 刘小莽,郑红星,张明华,刘昌明.青藏高原蒸发皿蒸发量时空变化特征及其成因的定量分析(英文)[J].地理学报(英文版),2011,21(4):594-608. |
| 作者姓名： | 刘小莽 郑红星 张明华 刘昌明 |
| 作者单位： | Institute of Geographic Sciences and Natural Resources Research;CAS;Department of Land;Air and Water Resources;University of California; |
| 基金项目： | The European Commission (Call FP7-ENV-2007-1), No.212921; National Basic Research Program of China, No.2010CB428406 |
| 摘 要： | Despite the observed increase in global temperature, observed pan evaporation in many regions has been decreasing over the past 50 years, which is known as the "pan evaporation paradox". The "pan evaporation paradox" also exists in the Tibetan Plateau, where pan evaporation has decreased by 3.06 mm a-2 (millimeter per annum). It is necessary to explain the mechanisms behind the observed decline in pan evaporation because the Tibetan Plateau strongly influences climatic and environmental changes in China, Asia and even in the Northern Hemisphere. In this paper, a derivation based approach has been used to quantitatively assess the contribution rate of climate factors to the observed pan evaporation trend across the Tibetan Plateau. The results showed that, provided the other factors remain constant, the increasing temperature should have led to a 2.73 mm a-2 increase in pan evaporation annually, while change in wind speed, vapor pressure and solar radiation should have led to a decrease in pan evaporation by 2.81 mm a-2, 1.96 mm a-2 and 1.11 mm a-2 respectively from 1970 to 2005. The combined effects of the four climate variables have resulted in a 3.15 mm a-2 decrease in pan evaporation, which is close to the observed pan evaporation trend with a relative error of 2.94%. A decrease in wind speed was the dominant factor for the decreasing pan evaporation, followed by an increasing vapor pressure and decreasing solar radiation, all of which offset the effect of increasing temperature across the Tibetan Plateau. |
| 关 键 词： | pan evaporation trend reference evapotranspiration attribution the Tibetan Plateau |
| 收稿时间： | 26 January 2009 |
Identification of dominant climate factor for pan evaporation trend in the Tibetan Plateau |
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| Xiaomang Liu,Hongxing Zheng,Minghua Zhang,Changming Liu.Identification of dominant climate factor for pan evaporation trend in the Tibetan Plateau[J].Journal of Geographical Sciences,2011,21(4):594-608. | |
| Authors: | Xiaomang Liu Hongxing Zheng Minghua Zhang Changming Liu |
| Institution: | 1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA 2. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China 3. Department of Land, Air and Water Resources, University of California, Davis, CA 95616, USA |
| Abstract: | Despite the observed increase in global temperature, observed pan evaporation in many regions has been decreasing over the past 50 years, which is known as the pan evaporation paradox. The pan evaporation paradox also exists in the Tibetan Plateau, where pan evaporation has decreased by 3.06 mm a-2 (millimeter per annum). It is necessary to explain the mechanisms behind the observed decline in pan evaporation because the Tibetan Plateau strongly influences climatic and environmental changes in China, Asia a... |
| Keywords: | pan evaporation trend reference evapotranspiration attribution the Tibetan Plateau |
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