Long-term rise in riverine dissolved organic carbon concentration is predicted by electrolyte solubility theory.
Long-term rise in riverine dissolved organic carbon concentration is predicted by electrolyte solubility theory.
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DOI：
10.1126/sciadv.ade3491
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发表时间：
2023-01-18
期刊：
影响因子：
13.6
通讯作者：
Evans, Chris D.
中科院分区：
文献类型：
--
作者：
Monteith, Donald T.;Henrys, Peter A.;Hruska, Jakub;de Wit, Heleen A.;Kram, Pavel;Moldan, Filip;Posch, Maximilian;Raike, Antti;Stoddard, John L.;Shilland, Ewan M.;Pereira, M. Gloria;Evans, Chris D.
河流溶解有机碳（DOC）通量的大小与大气CO2的陆地汇相似，但控制它的因素尚未确定，而且在地球系统模型（ESMs）中基本上没有。在这里，我们表明，对于一系列欧洲水源集水区，电解质溶解度理论解释了降水离子强度（IS）下降如何增加可溶性土壤有机质（OM）热缓和池的溶解，而水文条件控制了这种OM进入水生系统的比例。溶解度将继续随着IS的下降呈指数级上升，直到在清洁空气政策下污染物离子沉积完全平缓。未来DOC的出口将越来越多地取决于变暖速率以及降水和海洋离子沉积强度和季节性的任何方向性变化。我们的研究结果为将全球碳循环这一组成部分的主导变化过程纳入esm提供了坚实的基础。提示：由于空气污染较少，雨水越稀，溶解的土壤有机质越多，导致河流变褐。
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. Teaser: More dilute rainwater, due to less polluted air, dissolves more soil organic matter, resulting in the browning of rivers.
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