Link between residence times and groundwater renewability obscured by hydraulics

Ferguson, Grant, Cuthbert, Mark O. ORCID: https://orcid.org/0000-0001-6721-022X, Jasechko, Scott, Manga, Michael, J.McDonnell, Jeffrey, McIntosh, Jennifer C., Noyes, Chander E., Lollar, Barbara Sherwood and Taylor, Richard G. 2026. Link between residence times and groundwater renewability obscured by hydraulics. Nature Geoscience Item availability restricted.

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Abstract

Aquifer residence times are commonly used to make inferences about groundwater system behaviour. However, the link between average aquifer residence times and hydraulic response times which control groundwater storage changes relevant to sustainable pumping, remains unclear. Here, we show that water levels in some aquifers containing fossil groundwater are controlled by modern climates while many others are affected by past climates over periods shorter than their aquifer residence times.

Item Type:	Article
Status:	In Press
Schools:	Schools > Earth and Environmental Sciences
Publisher:	Nature Research
ISSN:	1752-0894
Date of First Compliant Deposit:	6 January 2026
Date of Acceptance:	8 December 2025
Last Modified:	08 Jan 2026 14:38
URI:	https://orca.cardiff.ac.uk/id/eprint/183597

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