Riverine Export of Aged Carbon Driven by Flow Path Depth and Residence Time

Environmental Science & Technology
Rebecca T BarnesPeter Raymond

Abstract

The flux of terrestrial C to rivers has increased relative to preindustrial levels, a fraction of which is aged dissolved organic C (DOC). In rivers, C is stored in sediments, exported to the ocean, or (bio)chemically processed and released as CO2. Disturbance changes land cover and hydrology, shifting potential sources and processing of DOC. To investigate the likely sources of aged DOC, we analyzed radiocarbon ages, chemical, and spectral properties of DOC and major ions from 19 rivers draining the coterminous U.S. and Arctic. DOC optics indicated that the majority is exported as aromatic, high molecular weight, modern molecules while aged DOC tended to consist of smaller, microbial degradation products. Aged DOC exports, observed regularly in arid basins and during base flow in arctic rivers, are associated with higher proportion of mineral weathering products, suggesting deeper flows paths. These patterns also indicate potential for production of microbial byproducts as DOC ages in soil and water with longer periods of time between production and transport. Thus, changes in hydrology associated with landscape alteration (e.g., tilling or shifting climates) that can result in deeper flow paths or longer residence times will ...Continue Reading

References

Sep 8, 2009·Environmental Science & Technology·David R GriffithPeter A Raymond
Sep 15, 2010·Ecology·Nina CaracoPeter Raymond
Jan 8, 2011·Science·David BastvikenAlex Enrich-Prast
Oct 8, 2011·Nature·Michael W I SchmidtSusan E Trumbore
Oct 3, 2012·Proceedings of the National Academy of Sciences of the United States of America·S Leigh McCallister, Paul A del Giorgio
Nov 22, 2013·Nature·Peter A RaymondPeter Guth

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Citations

Oct 31, 2019·Global Change Biology·Travis W DrakeRobert G M Spencer
Jul 25, 2019·Nature Geoscience·Travis W DrakeRobert G M Spencer
Mar 22, 2020·Nature Communications·Craig T ConnollyJames W McClelland
Nov 12, 2019·Environmental Science & Technology·Laure GandoisNikita Tananaev
Jan 13, 2021·Environmental Pollution·Seung-Cheol LeeNeung-Hwan Oh
Jan 1, 2021·Geophysical Research Letters·Melissa S SchwabTimothy I Eglinton
Mar 6, 2021·Nature Communications·Danielle K HareMartin A Briggs
Mar 20, 2021·Scientific Reports·Geert HensgensMartin Berggren

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