Preprints
https://doi.org/10.5194/hess-2021-524
https://doi.org/10.5194/hess-2021-524

  27 Oct 2021

27 Oct 2021

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

Recent decrease in summer precipitation over the Iberian Peninsula closely links to reduction of local moisture recycling

Yubo Liu1,2, Monica Garcia3, Chi Zhang1,4, and Qiuhong Tang1,2 Yubo Liu et al.
  • 1Key Laboratory of Water Cycle and Related Land SurfaceProcesses, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
  • 2University of Chinese Academy of Sciences, Beijing, China
  • 3Department of Environmental Engineering, Technical University of Denmark, Lyngby, 2800, Denmark
  • 4Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China

Abstract. The inherently dry summer climate of the Iberian Peninsula (IP) is undergoing drought exacerbated by more intense warming and reduced precipitation. Although many studies have studied changes in summer climate factors, it is still unclear how the changes in moisture contribution from the source lead to the decrease in summer precipitation. This study investigates the differences in the IP precipitationshed between 1980–1997 and 1998–2019 using the Water Accounting Model-2layers with ERA5 data, and assesses the role of local recycling and external moisture in reducing summer precipitation. Our findings indicate that the moisture contributions from the local IP, and from the west and the east of the precipitationshed contributed 1.7, 3.6 and 1.1 mm mon−1 less precipitation after 1997 than before 1997, accounting for 26 %, 57 % and 17 % of the main source supply reduction, respectively. The significant downward trend of the IP local recycling closely links to the disappearance of the wet years after 1997 as well as the decrease of local contribution in the dry years. Moreover, the feedback between the weakened local moisture recycling and the drier land surface can exacerbate the local moisture scarcity and summer drought.

Yubo Liu et al.

Status: open (until 07 Jan 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on hess-2021-524', Anonymous Referee #1, 28 Nov 2021 reply

Yubo Liu et al.

Yubo Liu et al.

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Short summary
Our findings indicate that the reduction of contribution to the Iberian Peninsula (IP) summer precipitation is mainly concentrated in the IP and its neighboring grids. Compared with 1980–1997, both local recycling and external moisutre were reduced during 1998–2019. The reduction of local recycling in the Iberian Peninsula closely links to the disappearance of the wet years and the decreasing contribution in the dry years.