Uncertainty in model estimates of global groundwater depth

Autor: Robert Reinecke, Sebastian Gnann, Lina Stein, Marc Bierkens, Inge de Graaf, Tom Gleeson, Gualbert Oude Essink, Edwin H Sutanudjaja, Claudia Ruz Vargas, Jarno Verkaik, Thorsten Wagener
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: Environmental Research Letters, Vol 19, Iss 11, p 114066 (2024)
Druh dokumentu: article
ISSN: 1748-9326
DOI: 10.1088/1748-9326/ad8587
Popis: Knowing the depth at which groundwater can be found below the land surface is critical for understanding its potential accessibility by ecosystems and society. Uncertainty in global scale water table depth (WTD) limits our ability to assess groundwater’s role in a water cycle altered by changing climate, land cover, and human water use. Global groundwater models offer a top–down pathway to gain this knowledge, but their uncertainty is currently poorly quantified. Here, we investigate four global groundwater models and reveal steady-state WTD disagreements of more than 100 m for one-third of the global land area. We find that model estimates of land areas with shallow groundwater at
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