[1]ZHAO Lu,LIANG Chuan.Attribution Analyses of Potential Evapotranspiration Change in Sichuan in Recent 50 Years[J].Research of Soil and Water Conservation,2014,21(04):26-30.

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Attribution Analyses of Potential Evapotranspiration Change in Sichuan in Recent 50 Years

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 21 Number of periods: 2014 04 Page number: 26-30 Column: Public date: 2014-08-28

Title:: Attribution Analyses of Potential Evapotranspiration Change in Sichuan in Recent 50 Years

Author(s):: ZHAO Lu^1,2, LIANG Chuan¹; 1. School of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China;
2. Department of Civil Engineering, Sichuan College of Architectural Technoledge, Deyang Sichuan 618000, China

Keywords:: FAO-56 Penman-Monteith; Sichuan Province; four regions; contribution rate method; ET₀

CLC:: S161.4

DOI:: -

Abstract:: FAO-56 Penman-Monteith method was used to estimate the monthly potential evapotranspiration (ET₀) from 1960 to 2010 in four different regions of Sichuan Province. Then the causes for ET₀ change in recent 50 years were analyzed by contribution rate method. Results show that in the whole province, Sichuan basin and mountainous area around basin, the negative contribution of decreased sunshine duration and wind speed to ET₀ is greater than the positive contribution of increased average, maximum, minimum temperature and decreased relative humidity to ET₀, which causes ET₀ to decrease. While in northwest Sichuan plateau the positive contribution of upward average, maximum, minimum temperature and downward relative humidity to ET₀ exceeds the negative contribution of downward sunshine duration and wind speed, inducing ET₀ to increase. In mountainous area of southwest Sichuan the negative contribution of decreased average, minimum temperature, sunshine duration and wind speed to ET₀ exceeds the positive contribution of increased maximum temperature and decreased relative humidity, resulting in decline of ET₀. The decreased sunshine duration in the whole province and Sichuan basin and the decreased wind speed in mountainous area around basin and mountainous area of southwest Sichuan are the primary contributors to ET₀ decrease, respectively. The increased ET₀ in northwest Sichuan plateau is mainly attributed to the increased minimum temperature.

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