Nearly a Third of the World’s Largest Aquifers are Overstressed, Amount of Remaining Groundwater Uncertain: 2 Studies

Quantifying Renewable Groundwater Stress with GRACE
Water Resources Research (June 16, 2015; DOI: 10.1002/2015WR017349) / by Alexandra S. Richey, et al.
http://onlinelibrary.wiley.com/doi/10.1002/2015WR017349/abstract
Uncertainty in global groundwater storage estimates in a total groundwater stress framework 
Water Resources Research (June 16, 2015; DOI: 10.1002/2015WR017351) / by Alexandra S. Richey, et al.
http://onlinelibrary.wiley.com/doi/10.1002/2015WR017351/abstract

[New York Times]  From the Arabian Peninsula to northern India to California’s Central Valley, nearly a third of the world’s 37 largest aquifers are being drained faster than they are being replenished, according to a recent study led by scientists at the University of California, Irvine. The aquifers are concentrated in food-producing regions that support up to two billion people.

A companion study indicates that the total amount of water in the aquifers, and how long it will last at current depletion rates, is still uncertain. “In most cases, we do not know how much groundwater exists in storage” to cover unsustainable pumping, the study said. Historical estimates, it argues, probably have unrealistically overstated total groundwater volume…

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