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

Autor: Monteith DT; UK Centre for Ecology and Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster LA1 4AP, UK., Henrys PA; UK Centre for Ecology and Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster LA1 4AP, UK., Hruška J; Czech Geological Survey, Klárov 3, 11821 Prague, Czech Republic.; Global Change Research Institute, Czech Academy of Sciences, Bělidla 986/4a, 603 00 Brno, Czech Republic., de Wit HA; Norwegian Institute for Water Research (NIVA), Oslo, Norway.; Centre for Biogeochemistry in the Anthropocene, Department of Biosciences, Section for Aquatic Biology and Toxicology, University of Oslo, Oslo, Norway., Krám P; Czech Geological Survey, Klárov 3, 11821 Prague, Czech Republic.; Global Change Research Institute, Czech Academy of Sciences, Bělidla 986/4a, 603 00 Brno, Czech Republic., Moldan F; IVL Swedish Environmental Research Institute, Box 530 21, 400 14 Göteborg, Sweden., Posch M; International Institute for Applied Systems Analysis (IIASA), A-2361 Laxenburg, Austria., Räike A; Finnish Environment Institute (SYKE), P.O.Box 140, FI-00790 Helsinki, Finland., Stoddard JL; US EPA, Corvallis, OR 97333, USA., Shilland EM; Environmental Change Research Centre, UCL, Gower Street, London WC1E 6BT, UK.; Life Sciences, Natural History Museum, Cromwell Road, London, SW7 5BD, UK.; School of Biological and Behavioural Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK., Pereira MG; UK Centre for Ecology and Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster LA1 4AP, UK., Evans CD; UK Centre for Ecology and Hydrology, Environment Centre Wales, Deiniol Road, Bangor, LL57 2UW, UK.
Jazyk: angličtina
Zdroj: Science advances [Sci Adv] 2023 Jan 18; Vol. 9 (3), pp. eade3491. Date of Electronic Publication: 2023 Jan 18.
DOI: 10.1126/sciadv.ade3491
Abstrakt: The riverine dissolved organic carbon (DOC) flux is of similar magnitude to the terrestrial sink for atmospheric CO 2 , 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.
Databáze: MEDLINE
Externí odkaz: