Global aquifers dominated by fossil groundwaters but wells vulnerable to modern contamination

Jasechko, Scott; Perrone, Debra; Befus, Kevin M.; Bayani Cardenas, M.; Ferguson, Grant; Gleeson, Tom; Luijendijk, Elco; McDonnell, Jeffrey J.; Taylor, Richard G.; Wada, Yoshihide; Kirchner, James W.

doi:10.1038/ngeo2943

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Global aquifers dominated by fossil groundwaters but wells vulnerable to modern contamination

Author(s): Scott Jasechko , Debra Perrone , Kevin M. Befus , M. Bayani Cardenas , Grant Ferguson , Tom Gleeson , Elco Luijendijk , Jeffrey J. McDonnell , Richard G. Taylor , Yoshihide Wada , James W. Kirchner

Publication date Created: April 25 2017

Publication date (Print): April 25 2017

Journal: Nature Geoscience

Publisher: Springer Nature

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Abstract

Groundwater that predates the Holocene is commonly assumed to be unaffected by modern contamination. A global analysis of fossil groundwater suggests that modern contaminants are present in deep wells that tap fossil aquifers.

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Most cited references 39

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Is Open Access

Estimating the volume and age of water stored in global lakes using a geo-statistical approach

Mathis Loïc Messager, Bernhard Lehner, Günther Grill … (2016)

Lakes are key components of biogeochemical and ecological processes, thus knowledge about their distribution, volume and residence time is crucial in understanding their properties and interactions within the Earth system. However, global information is scarce and inconsistent across spatial scales and regions. Here we develop a geo-statistical model to estimate the volume of global lakes with a surface area of at least 10 ha based on the surrounding terrain information. Our spatially resolved database shows 1.42 million individual polygons of natural lakes with a total surface area of 2.67 × 106 km2 (1.8% of global land area), a total shoreline length of 7.2 × 106 km (about four times longer than the world's ocean coastline) and a total volume of 181.9 × 103 km3 (0.8% of total global non-frozen terrestrial water stocks). We also compute mean and median hydraulic residence times for all lakes to be 1,834 days and 456 days, respectively.