Preprints
https://doi.org/10.5194/hess-2021-616
https://doi.org/10.5194/hess-2021-616

  14 Jan 2022

14 Jan 2022

Review status: this preprint is currently under review for the journal HESS.

Attributing of global evapotranspiration trends based on the Budyko framework

Shijie Li1, Guojie Wang1, Chenxia Zhu1, Jiao Lu1, Waheed Ullah1, Daniel Fiifi Tawia Hagan1, Giri Kattel1,2,3, and Jian Peng4,5 Shijie Li et al.
  • 1Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC–FEMD), School of Geographical Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China
  • 2Water and Agriculture Program (WEAP), Department of Infrastructure Engineering, The University of Melbourne, Melbourne 3010, Australia
  • 3Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China
  • 4Department of Remote Sensing, Helmholtz Centre for Environmental Research-UFZ, Permoserstrasse 15, 04318, Leipzig, Germany
  • 5Remote Sensing Centre for Earth System Research, Leipzig University, Talstr. 35, 04103, Leipzig, Germany

Abstract. Actual evapotranspiration (ET) is an essential variable in the hydrological process, linking the carbon, water, and energy cycles. Global ET has significantly changed in the warming climate. Although increasing vapour pressure deficit (VPD) due to global warming enhances atmospheric water demand, it remains unclear how the dynamics of ET are affected. In this study, using multiple datasets, we disentangled the relative contributions of precipitation, net radiation, air temperature (T1), VPD, and wind speed on affecting annual ET linear trend using an advanced separation method that considers the Budyko framework. It is found that the precipitation variability dominantly controls global ET in the dry climates, the net radiation has substantial control over ET in the tropical regions, and VPD is impacting ET trends in boreal mid-latitude climate. The critical role of VPD in controlling ET trends is particularly emphasized due to its influence in controlling the land-atmosphere interactions.

Shijie Li et al.

Status: open (until 11 Mar 2022)

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Shijie Li et al.

Shijie Li et al.

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Short summary
It is found that the precipitation variability dominantly controls global ET in the dry climates, the net radiation has substantial control over ET in the tropical regions, and VPD is impacting ET trends in boreal mid-latitude climate. The critical role of VPD in controlling ET trends is particularly emphasized due to its influence in controlling the land-atmosphere interactions.