08 Apr 2024
 | 08 Apr 2024
Status: this preprint is open for discussion.

Changes in mean evapotranspiration dominate groundwater recharge in semi-arid regions

Tuvia Turkeltaub and Golan Bel

Abstract. Groundwater is one of the most essential natural resources and is affected by climate variability. However, our understanding of the effects of climate on groundwater recharge (GR), particularly in dry regions, is limited. Future climate projections suggest changes in many statistical characteristics of the potential evapotranspiration (ETref) and the rainfall that dictates the GR. To better understand the relationship between climate statistics and GR, we separately considered changes to the mean, STD, and extreme statistics of the ETref and the rainfall. We simulated the GR under different climate conditions in multiple semi-arid locations worldwide. We find that changes in the average ETref have the most significant impact on GR. Interestingly, we find that changes in the extreme ETref statistics have much weaker effects on the GR than changes in extreme rain statistics. Contradictory results of previous GR studies may be explained by the differences in the projected climate statistics.

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Tuvia Turkeltaub and Golan Bel

Status: open (until 03 Jun 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on egusphere-2024-433', Giacomo Medici, 11 Apr 2024 reply
  • RC1: 'Comment on egusphere-2024-433', Anonymous Referee #1, 20 Apr 2024 reply
  • RC2: 'Comment on egusphere-2024-433', Anonymous Referee #2, 12 May 2024 reply
Tuvia Turkeltaub and Golan Bel
Tuvia Turkeltaub and Golan Bel


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Short summary
Future climate projections suggest climate change will impact groundwater recharge, with its exact effects uncertain due to incomplete understanding of rainfall, evapotranspiration, and recharge relations. Here, we studied the effects of changes in the average, spread, and frequency of extreme events in the rainfall and evapotranspiration on groundwater recharge. We found that increasing or decreasing the potential evaporation has the most dominant effect on groundwater recharge.