Long-term rise in riverine dissolved organic carbon concentration is predicted by electrolyte solubility theory

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http://eprints.org/relation/isVersionOf https://pure.iiasa.ac.at/id/document/100563 http://eprints.org/relation/isVolatileVersionOf https://pure.iiasa.ac.at/id/document/100563 http://eprints.org/relation/issmallThumbnailVersionOf https://pure.iiasa.ac.at/id/document/100563 archive 353 disk0/00/01/85/76 2023-01-19 12:40:01 2023-01-23 17:50:21 2023-01-19 12:40:01 article show Monteith D.T. Henrys P.A. Hruska J. de Wit H.A. Kram P. Moldan F. Posch M. 6733 0000-0001-8649-9129 Raike A. Stoddard J.L. Shilland E.M. Pereira M. Evans C.D. Long-term rise in riverine dissolved organic carbon concentration is predicted by electrolyte solubility theory pub ECE ECEPM The riverine dissolved organic carbon (DOC) flux is of similar magnitude to the terrestrial sink for atmospheric CO2, but the factors controlling it remain poorly determined and are largely absent from Earth system models (ESMs). Here, we show, for a range of European headwater catchments, that electrolyte solubility theory explains how declining precipitation ionic strength (IS) has increased the dissolution of thermally moderated pools of soluble soil organic matter (OM), while hydrological conditions govern the proportion of this OM entering the aquatic system. Solubility will continue to rise exponentially with declining IS until pollutant ion deposition fully flattens out under clean air policies. Future DOC export will increasingly depend on rates of warming and any directional changes to the intensity and seasonality of precipitation and marine ion deposition. Our findings provide a firm foundation for incorporating the processes dominating change in this component of the global carbon cycle in ESMs. More dilute rainwater, due to less polluted air, dissolves more soil organic matter, resulting in the browning of rivers. 2023-01-18 published American Association for the Advancement of Science 10.1126/sciadv.ade3491 3069 public Science Advances 9 3 eade3491 TRUE 2375-2548 no info:eu-repo/semantics/article