电解液溶解度理论预测了河流溶解有机碳浓度的长期上升，这一成果由英国生态学和水文学中心Donald T. Monteith的研究组经过不懈努力而取得。2023年1月18日出版的《科学进展》杂志发表了这一最新研究成果。

课题组研究人员发现，对于一系列欧洲源头流域，电解质溶解度理论解释了降水离子强度(IS)的下降是如何增加热调节的可溶性土壤有机质(OM)池的溶解的，而水文条件决定这些可溶性土壤有机质进入水生系统的的比例。溶解度将随着IS的下降继续呈指数级上升，直到污染物离子沉积在清洁空气政策下完全变平。未来的河流溶解有机碳出口将越来越取决于变暖的速度以及降水和海洋离子沉积的强度和季节性的方向变化。研究结果为在地球系统模型中纳入主导全球碳循环这一组成部分变化的过程提供了坚实的基础。

研究人员表示，河流溶解有机碳(DOC)通量的大小与大气二氧化碳的陆地汇相似，但控制它的因素仍然难以确定，并且在地球系统模型(ESMs)中基本不存在。

附：英文原文

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

Author: Donald T. Monteith, Peter A. Henrys, Jakub Hruka, Heleen A. de Wit, Pavel Krám, Filip Moldan, Maximilian Posch, Antti Rike, John L. Stoddard, Ewan M. Shilland, M. Gloria Pereira, Chris D. Evans

Issue&Volume: 2023-01-18

Abstract: 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.

DOI: ade3491

Source: https://www.science.org/doi/10.1126/sciadv.ade3491