[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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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:
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Interannual Change and Attribution of Reference Evapotranspiration over Jialingjiang Basin
- Author(s):
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LYU Mingquan1, ZHANG Lei2, WU Shengjun1
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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
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- Keywords:
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reference evapotranspiration; attribution analysis; dominant factor; abrupt change; Jialingjiang Basin
- CLC:
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P426.2
- DOI:
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- Abstract:
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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.