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Decreasing Reference Evapotranspiration in a Warming Climate—A Case of Changjiang (Yangtze) River Catchment During 1970–2000


doi: 10.1007/s00376-006-0513-4

  • This study deals with temporal trends in the Penman-Monteith reference evapotranspiration estimated from standard meteorological observations, observed pan evaporation, and four related meteorological variables during 1970–2000 in the Yangtze River catchment. Relative contributions of the four meteorological variables to changes in the reference evapotranspiration are quantified. The results show that both the reference evapotranspiration and the pan evaporation have significant decreasing trends in the upper, the middle as well as in the whole Changjiang (Yangtze) River catchment at the 5% significance level, while the air temperature shows a significant increasing trend. The decreasing trend detected in the reference evapotranspiration can be attributed to the significant decreasing trends in the net radiation and the wind speed.
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Manuscript History

Manuscript received: 10 July 2006
Manuscript revised: 10 July 2006
通讯作者: 陈斌, bchen63@163.com
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Decreasing Reference Evapotranspiration in a Warming Climate—A Case of Changjiang (Yangtze) River Catchment During 1970–2000

  • 1. Department of Geosciences, University of Oslo, P. O Box 1047 Blindern, NO-0316 Oslo, Norway, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008,Department of Earth Sciences, Uppsala University, Villavagen 16, S-75236 Uppsala, Sweden, Department of Earth Sciences, Gothenburg University, Sweden,Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008,Department of Earth Sciences, Gothenburg University, Sweden, Laboratory for Climate Studies/National Climate Center, China Meteorological Administration, Beijing 100081

Abstract: This study deals with temporal trends in the Penman-Monteith reference evapotranspiration estimated from standard meteorological observations, observed pan evaporation, and four related meteorological variables during 1970–2000 in the Yangtze River catchment. Relative contributions of the four meteorological variables to changes in the reference evapotranspiration are quantified. The results show that both the reference evapotranspiration and the pan evaporation have significant decreasing trends in the upper, the middle as well as in the whole Changjiang (Yangtze) River catchment at the 5% significance level, while the air temperature shows a significant increasing trend. The decreasing trend detected in the reference evapotranspiration can be attributed to the significant decreasing trends in the net radiation and the wind speed.

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