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[1]LYU Mingquan,ZHANG Lei,WU Shengjun.Interannual Change and Attribution of Reference Evapotranspiration over Jialingjiang Basin[J].Research of Soil and Water Conservation,2019,26(03):77-85.

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Interannual Change and Attribution of Reference Evapotranspiration over Jialingjiang Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 03 Page number: 77-85 Column: Public date: 2019-04-12

Title:: Interannual Change and Attribution of Reference Evapotranspiration over Jialingjiang Basin

Author(s):: LYU Mingquan¹, ZHANG Lei², WU Shengjun¹; 1. Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400714, China;
2. Chongqing Yujia Environmental Impact Assessment Co., Ltd. Chongqing 400042, China

Keywords:: reference evapotranspiration; attribution analysis; dominant factor; abrupt change; Jialingjiang Basin

CLC:: P426.2

DOI:: -

Abstract:: As a dominant consumer for solar radiation, evapotranspiration is a primary link for the surface energy balance and component of hydrologic cycle. In recent years, the new dynamics regarding reference evapotranspiration (ET₀) have been detected in some regions in the world. However, whether a new dynamics of ET₀ exist in Jialingjiang River Basin was not available in the literature. In addition, quantitative attribution of changes in ET₀ to key climatic factors was also not available in the literature. Temporal patterns in ET₀ and related driving factors over Jialingjiang Basin were investigated in the period 1960-2013 based on daily data from 30 standard meteorological stations. The non-parametric Mann-Kendal method was used to detect trend of mean annual ET₀. Some change-point year detection including Pittett, moving T test and Cumulative Sum algorithm, were applied to identify abrupt year. For the purpose of ET₀ spatialization, Kringing interpolation method also was utilized. The results showed that:(1) the mean ET₀ reduced at the rate of 0.43 mm/year, and the mean ET₀ went through high-low-high phases; the mean ET₀ changed abruptly around 1981, the mean ET₀ slightly increasing by 0.4 mm/year between 1960-1981, while an obvious increasing trend at 2.62 mm/year appeared between 1982-2013; (2) ‘evaporation paradox’ phenomenon was characterized by spatial and temporal disparities, ‘evaporation paradox’ phenomenon could be detected in the period 1960-2013 when comparing the mean ET₀ and air temperature trends; however, with respect to the period 1960-1981 and 1982-2013, the areas where ‘Evaporation paradox’ phenomenon could be detected were small; (3) in the period from 1960 to 1981, wind speed and solar radiation were the leading climatic variables to change ET₀; During 1982-2013, air temperature was the dominant factor to increase ET₀ because of climate warming.

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