Anthropogenic water withdrawals modify freshwater inorganic carbon fluxes across the United States

Flint, Elizabeth ORCID: https://orcid.org/0000-0002-5781-2523; Ascott, Matthew ORCID: https://orcid.org/0000-0002-4868-2069; Gooddy, Daren ORCID: https://orcid.org/0000-0002-6015-1332; Stahl, Mason O.; Surridge, Ben W. J. ORCID: https://orcid.org/0000-0003-2425-1739. 2025 Anthropogenic water withdrawals modify freshwater inorganic carbon fluxes across the United States. Environmental Science & Technology. 10.1021/acs.est.4c09426

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Abstract/Summary

Quantifying inorganic carbon fluxes to and from freshwater environments is essential for the accurate determination of the total amount of carbon exported to both the atmosphere and oceans. However, understanding of how anthropogenic freshwater withdrawals perturb land-freshwater-ocean and freshwater-atmosphere inorganic carbon fluxes is limited. Using the United States (US) as an exemplar, we estimate that fresh surface water withdrawals across the country during the year 2015 resulted in a median gross dissolved inorganic carbon (DIC) retention flux of 8.2 (uncertainty range: 6.7–9.9) Tg C yr–1, equivalent to 28.3% of the total export of DIC to the oceans from US rivers. The median gross retention flux due to fresh groundwater withdrawals was 6.9 (uncertainty range: 5.3–8.8) Tg C yr–1, over eight times the magnitude of the DIC flux to the oceans by US subterranean groundwater discharge. The degassing of CO2 supersaturated groundwater following withdrawal emitted 3.6 (uncertainty range: 2.2–5.5) Tg of CO2 yr–1, 112% larger than previous estimates. On a county level, these CO2 emissions exceeded CO2 emissions from major emitting facilities across 45% of US counties. Reported results and a data analysis framework have important implications for the accurate development of carbon budgets across the US and around the world.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1021/acs.est.4c09426
UKCEH and CEH Sections/Science Areas:	Water and Climate Science (2025-)
ISSN:	0013-936X
Additional Information. Not used in RCUK Gateway to Research.:	Open Access paper - full text available via Official URL link.
Additional Keywords:	dissolved inorganic carbon, carbon dioxide emissions, freshwater withdrawals, biogeochemical cycling, carbon budgets
NORA Subject Terms:	Ecology and Environment Hydrology
Date made live:	20 Feb 2025 09:14 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/538935

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