Marked isotopic variability within and between the Amazon River and marine dissolved black carbon pools.
作者： Alysha I. Coppola , Michael Seidel , Nicholas D. Ward , Daniel Viviroli , Gabriela S. Nascimento
DOI: 10.1038/S41467-019-11543-9
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摘要: Riverine dissolved organic carbon (DOC) contains charcoal byproducts, termed black (BC). To determine the significance of BC as a sink atmospheric CO2 and reconcile budgets, sources fate this large, slow-cycling elusive pool must be constrained. The Amazon River is significant part global cycling because it exports an order magnitude more DOC, thus (DBC), than any other river. We report spatially resolved DBC quantity radiocarbon (Δ14C) measurements, paired with molecular-level characterization matter from tributaries during low discharge. proportion BC-like polycyclic aromatic structures decreases downstream, but marked spatial variability in abundance Δ14C values molecular markers imply dynamic manner that incongruent bulk DOC. estimate flux 1.9-2.7 Tg yr-1 composed predominately young DBC, suggesting loss processes modern are important.
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