Journal
HYDROLOGICAL PROCESSES
Volume 28, Issue 3, Pages 1025-1031Publisher
WILEY
DOI: 10.1002/hyp.9643
Keywords
potential evapotranspiration; climate change; influence factor; arid region
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Funding
- National Basic Research Program of China (973 Program) [2010CB951003]
- West Light Foundation of Chinese Academy of Sciences [XBBS201026, XBBS201008]
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Evaporation paradox and its attribution have become a hot research topic in hydrology in recent years. This study estimates the potential evapotranspiration (ET0) using modified Penman-Monteith method and analyzes the corresponding trend attribution based on the long-term meteorological data collected at 81 ground-based meteorological stations in Northwestern arid region of China during the period 1958-2010. The analysis results show: (1) The ET0 has exhibited an obvious decreasing trend until the early 1990s; however, the downward trend has been reversed to an upward trend after then. (2) Decrease in diurnal temperature range (DTR) and wind speed (WS) may lead to the decrease of ET0 during 1956-1993. The change of dominant factors in the ET0 trend has differences after the early 1990s; observed increase in WS is the primary factor contributing to the reversion of ET0. Copyright (c) 2012 John Wiley & Sons, Ltd.
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