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Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface
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Understanding global groundwater-climate interactions.

Christopher E Ndehedehe1, Oluwafemi E Adeyeri2, Alex O Onojeghuo3

  • 1School of Environment & Science, Griffith University, Nathan, QLD 4111, Australia; Australian Rivers Institute, Griffith University, Nathan, QLD 4111, Australia.

The Science of the Total Environment
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Global climate variability significantly impacts groundwater recharge and water availability worldwide. Understanding these connections, like the Pacific Decadal Oscillation

Keywords:
Climate teleconnectionsDroughtsHydrologyRechargeSurface water

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Area of Science:

  • Hydrology and Climatology
  • Environmental Science
  • Water Resource Management

Background:

  • Global warming intensifies hydrological extremes, affecting water availability and groundwater resources.
  • Understanding climate's influence on groundwater is crucial for water policy and managing freshwater supply.
  • Hydrological extremes like drought exacerbate social inequalities in water access.

Purpose of the Study:

  • To enhance the understanding of climate variability's influence on global groundwater systems.
  • To assess groundwater responses to climate variability and identify groundwater-climate interaction hotspots.
  • To explore the role of climate teleconnections in regulating global groundwater fluxes.

Main Methods:

  • Statistical analyses, including multi-linear regression and wavelet analyses, were employed.
  • The study analyzed groundwater-climate interactions from 2003 to 2017.
  • Relationships between groundwater recharge and rainfall, as well as climate teleconnections, were assessed.

Main Results:

  • Climate variability significantly influences groundwater recharge, with strong groundwater-rainfall relationships observed in regions like the Amazon and Congo basins.
  • No direct relationship was found in arid regions with fossil groundwater, such as the Nubian sandstone aquifer.
  • Global climate teleconnections, notably the Pacific Decadal Oscillation (PDO), strongly regulate global groundwater fluxes, with PDO showing the strongest correlation (r=0.80).

Conclusions:

  • Climate variability is a key driver of global groundwater recharge and distribution.
  • Pacific Ocean climate patterns, particularly PDO, offer potential for predicting climate change impacts on freshwater systems.
  • Arid regions face groundwater scarcity during droughts, impacting surface-groundwater interactions and water availability.