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Global groundwater solute composition and concentrations

May 3, 2022

Informed analysis of policies related to food security, global climate change, wetland ecology, environmental nutrient flux, element cycling, groundwater weathering, continental denudation, human health, etc. depends to a large extent on quantitative estimates of solute mass fluxes into and out of all global element pools including the enigmatic global aquifer systems. Herein for the first time, we proffer the mean global solute concentration of all major and selected minor and trace solutes in the active groundwater that represents 99% of liquid fresh water on Earth. Concentrations in this significant element pool have yielded to a geospatial machine learning kNN-nearest neighbors’ algorithm with numerous geospatial predictors utilizing a large new lithology/climate/aquifer age/elevation based solute database. The predicted concentrations are consistent with traditional solute ratios, concentrations, and thermodynamic saturation indices.

Publication Year 2022
Title Global groundwater solute composition and concentrations
DOI 10.1111/gwat.13205
Authors Warren W. Wood, Pauline L. Smedley, Bruce D. Lindsey, Warren T. Wood, Roberto E. Kirchheim, John A. Cherry
Publication Type Article
Publication Subtype Journal Article
Series Title Groundwater
Index ID 70231565
Record Source USGS Publications Warehouse
USGS Organization WMA - Earth System Processes Division