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

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accepted 77178 2 213244 document 77178 lightbox.jpg image/png 192415d541d02222efb3863d2dd123ff MD5 56570 2017-04-26 07:08:40 https://pure.iiasa.ac.at/id/eprint/14544/9/lightbox.jpg 14544 9 9 image/png other Thumbnails conversion from text to thumbnail_lightbox en staffonly

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/77177 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/77177 http://eprints.org/relation/isIndexCodesVersionOf https://pure.iiasa.ac.at/id/document/77177 archive 2 disk0/00/01/45/44 2017-04-25 08:07:58 2021-08-27 17:28:51 2017-04-25 08:07:58 article show Jasechko S. Perrone D. Befus K.M. Bayani Cardenas M. Ferguson G. Gleeson T. Luijendijk E. McDonnell J.J. Taylor R.G. Wada Y. 8940 0000-0003-4770-2539 Kirchner J.W. Global aquifers dominated by fossil groundwaters but wells vulnerable to modern contamination pub prog_wat Water resources The vulnerability of groundwater to contamination is closely related to its age. Groundwaters that infiltrated prior to the Holocene have been documented in many aquifers and are widely assumed to be unaffected by modern contamination. However, the global prevalence of these ‘fossil’groundwaters and their vulnerability to modern-era pollutants remain unclear. Here we analyse groundwater carbon isotope data (12C, 13C, 14C) from 6,455 wells around the globe. We show that fossil groundwaters comprise a large share (42–85%) of total aquifer storage in the upper 1 km of the crust, and the majority of waters pumped from wells deeper than 250 m. However, half of the wells in our study that are dominated by fossil groundwater also contain detectable levels of tritium, indicating the presence of much younger, decadal-age waters and suggesting that contemporary contaminants may be able to reach deep wells that tap fossil aquifers. We conclude that water quality risk should be considered along with sustainable use when managing fossil groundwater resources. 2017-04-27 10.1038/ngeo2943 2601 public Nature Geoscience 10 6 425-429 TRUE 1752-0894 FALSE no info:eu-repo/semantics/article