Journal cover Journal topic
Earth System Dynamics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 4.351 IF 4.351
  • IF 5-year value: 5.124 IF 5-year
    5.124
  • CiteScore value: 4.44 CiteScore
    4.44
  • SNIP value: 1.250 SNIP 1.250
  • IPP value: 4.10 IPP 4.10
  • SJR value: 2.203 SJR 2.203
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 29 Scimago H
    index 29
  • h5-index value: 31 h5-index 31
Discussion papers
https://doi.org/10.5194/esd-2019-43
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esd-2019-43
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 09 Sep 2019

Submitted as: research article | 09 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Dynamics (ESD).

Groundwater storage dynamics in the world's large aquifer systems from GRACE: uncertainty and role of extreme precipitation

Mohammad Shamsudduha1,2 and Richard G. Taylor1 Mohammad Shamsudduha and Richard G. Taylor
  • 1Department of Geography, University College London, London, UK
  • 2Department of Geography, University of Sussex, Falmer, Brighton, UK

Abstract. Under variable and changing climates groundwater storage sustains vital ecosystems and enables freshwater withdrawals globally for agriculture, drinking-water, and industry. Here, we assess recent changes in groundwater storage (ΔGWS) from 2002 to 2016 in 37 of the world's large aquifer systems using an ensemble of datasets from the Gravity Recovery and Climate Experiment (GRACE) and Land Surface Models (LSMs). Ensemble GRACE-derived ΔGWS is well reconciled to in-situ observations (r = 0.62–0.86, p value < 0.001) for two tropical basins with regional piezometric networks and contrasting climate regimes. Trends in GRACE-derived ΔGWS are overwhelmingly non-linear; indeed linear declining trends adequately (R2 > 0.5, p value < 0.001) explain variability in only two aquifer systems. Non-linearity in ΔGWS at the scale of GRACE (~ 200,000 km2) derives, in part, from the episodic nature of groundwater replenishment associated with extreme annual (> 90th percentile, 1901–2016) precipitation and is inconsistent with prevailing narratives of global-scale groundwater depletion. Substantial uncertainty remains in estimates of GRACE-derived ΔGWS, evident from 20 realisations presented here, but these data provide a regional context to changes in groundwater storage observed more locally through piezometry.

Mohammad Shamsudduha and Richard G. Taylor
Interactive discussion
Status: open (until 22 Nov 2019)
Status: open (until 22 Nov 2019)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement
Mohammad Shamsudduha and Richard G. Taylor
Mohammad Shamsudduha and Richard G. Taylor
Viewed  
Total article views: 395 (including HTML, PDF, and XML)
HTML PDF XML Total Supplement BibTeX EndNote
290 99 6 395 14 5 5
  • HTML: 290
  • PDF: 99
  • XML: 6
  • Total: 395
  • Supplement: 14
  • BibTeX: 5
  • EndNote: 5
Views and downloads (calculated since 09 Sep 2019)
Cumulative views and downloads (calculated since 09 Sep 2019)
Viewed (geographical distribution)  
Total article views: 320 (including HTML, PDF, and XML) Thereof 320 with geography defined and 0 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 
Cited  
Saved  
No saved metrics found.
Discussed  
Latest update: 16 Nov 2019
Publications Copernicus
Download
Short summary
Recent assessments of the sustainability of global groundwater resources using the Gravity Recovery and Climate Experiment (GRACE) satellites assume that the underlying trends are linear. Here, we assess recent changes in groundwater storage (ΔGWS) in the world's large aquifer systems using an ensemble of GRACE datasets and show that trends are mostly non-linear. Non-linearity in ΔGWS derives, in part, from the episodic nature of groundwater replenishment associated with extreme precipitation.
Recent assessments of the sustainability of global groundwater resources using the Gravity...
Citation