Fresh groundwater discharge insignificant for the world's oceans but important for coastal ecosystems.

Nature Communications
Elco LuijendijkNils Moosdorf

Abstract

The flow of fresh groundwater may provide substantial inputs of nutrients and solutes to the oceans. However, the extent to which hydrogeological parameters control groundwater flow to the world's oceans has not been quantified systematically. Here we present a spatially resolved global model of coastal groundwater discharge to show that the contribution of fresh groundwater accounts for ~0.6% (0.004%-1.3%) of the total freshwater input and ~2% (0.003%-7.7%) of the solute input for carbon, nitrogen, silica and strontium. However, the coastal discharge of fresh groundwater and nutrients displays a high spatial variability and for an estimated 26% (0.4%-39%) of the world's estuaries, 17% (0.3%-31%) of the salt marshes and 14% (0.1-26%) of the coral reefs, the flux of terrestrial groundwater exceeds 25% of the river flux and poses a risk for pollution and eutrophication.

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Citations

Dec 17, 2020·Proceedings. Biological Sciences·Nyssa J SilbigerKatie Lubarsky
Jan 10, 2021·Nature Communications·Kimberley K MayfieldAdina Paytan
Nov 2, 2020·Environmental Science and Pollution Research International·B S K KumarV V S S Sarma
Feb 5, 2021·FEMS Microbiology Reviews·Clara Ruiz-GonzálezJordi Garcia-Orellana
Mar 20, 2021·The Science of the Total Environment·Shibin ZhaoZhigang Yu
Jun 5, 2021·Environmental Science & Technology·Till OehlerNils Moosdorf
Jul 14, 2021·Environmental Science and Pollution Research International·Sundara Pandian RajaveniLakshmanan Elango
Oct 16, 2021·The Science of the Total Environment·Dongmei Han, Matthew J Currell

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