Seasonal changes in the age and structure of dissolved organic carbon in Siberian rivers and streams

J. C. Neff, J. C. Finlay, S. A. Zimov, S. P. Davydov, J. J. Carrasco, E. A.G. Schuur, A. I. Davydova

Research output: Contribution to journalArticlepeer-review

164 Scopus citations

Abstract

We examined the age and structural composition of dissolved organic carbon (DOC) transported in the Kolyma River, two large tributaries and several small upland and lowland streams in 2003. The sampling took place under ice through the winter and included the spring flood period. Radiocarbon measurements of the DOC indicated that the bulk of the annual DOC flux was modem in origin .(Δ14C > 100‰) and pyrolysis-gas chromatography/mass spectroscopy techniques showed high concentration of terrestrial lignin monomers consistent with vigorous leaching of surface horizons during the spring thaw. By September 2003 however, little terrestrial lignin was present and the radiocarbon age became significantly older (Δ 14C < 0‰) indicating that the mechanism of DOC generation transitions from surface to deeper soils or other terrestrial sources of old, previously stabilized C.

Original languageEnglish (US)
Article numberL23401
JournalGeophysical Research Letters
Volume33
Issue number23
DOIs
StatePublished - Dec 16 2006

Fingerprint Dive into the research topics of 'Seasonal changes in the age and structure of dissolved organic carbon in Siberian rivers and streams'. Together they form a unique fingerprint.

Cite this