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Zhang, Haoyu; Wang, Shuai; Ye, Chongchong; Wang, Yaping

Trends and attribution analysis of modelled evapotranspiration on the Tibetan Plateau

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  • Media type: E-Article
  • Title: Trends and attribution analysis of modelled evapotranspiration on the Tibetan Plateau
  • Contributor: Zhang, Haoyu; Wang, Shuai; Ye, Chongchong; Wang, Yaping
  • imprint: Wiley, 2022
  • Published in: Hydrological Processes
  • Language: English
  • DOI: 10.1002/hyp.14527
  • ISSN: 0885-6087; 1099-1085
  • Origination:
  • Footnote:
  • Description: <jats:title>Abstract</jats:title><jats:p>Evapotranspiration (<jats:styled-content style="fixed-case">ET</jats:styled-content>) is an important part of the hydrological cycle, significantly influencing water distribution, energy cycle, and plant growth. In the context of global warming and acceleration of the water cycle, it is of great significance to analyse the trend and attribution of <jats:styled-content style="fixed-case">ET</jats:styled-content> on the Tibetan Plateau (<jats:styled-content style="fixed-case">TP</jats:styled-content>), which is most a sensitive and vulnerable area of the world. In this article, <jats:styled-content style="fixed-case">ET</jats:styled-content> products, obtained from the improved <jats:styled-content style="fixed-case">Penman–Monteith–Leuning</jats:styled-content> model with 1 km spatial resolution and 8 days temporal resolution, were used to investigate the trend and attribution of modelled <jats:styled-content style="fixed-case">ET</jats:styled-content> and its components on the <jats:styled-content style="fixed-case">TP</jats:styled-content> during the 2003–2017 period. The modelling results show the <jats:styled-content style="fixed-case">ET</jats:styled-content>, soil evaporation (E), and vegetation transpiration (T) present a highly similar spatial pattern, with a distinct decreasing gradient from the humid southeastern areas to the arid northwestern areas of the plateau. In terms of its components, E (269 mm yr<jats:sup>−1</jats:sup>) contributes about 70% of <jats:styled-content style="fixed-case">ET</jats:styled-content> (385 mm yr<jats:sup>−1</jats:sup>), especially in the northwestern region. Although the relationship between <jats:styled-content style="fixed-case">ET</jats:styled-content> and elevation is not clear, the results showed that E increased with elevation, while T exhibited the opposite trend. At the same time, approximately 80% of the grids showed an increasing trend (increasing at a rate of 4.7 mm yr<jats:sup>−1</jats:sup>), mainly concentrated in the southeastern area, where the increased <jats:styled-content style="fixed-case">ET</jats:styled-content> in forests and alpine meadows was the most obvious. Variations of modelled <jats:styled-content style="fixed-case">ET</jats:styled-content> on the <jats:styled-content style="fixed-case">TP</jats:styled-content> is distinguished into energy‐restricted and water‐restricted regions, corresponding respectively to the eastern region affected by temperature, and the western region controlled by soil moisture. The results of the present study can greatly improve our understanding of the hydrological cycle and the ability to manage water resources on the <jats:styled-content style="fixed-case">TP</jats:styled-content> within the context of global climate change.</jats:p>