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

doi:10.1029/2006GL028222

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

Ecology, Evolution and Behavior

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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 language	English (US)
Article number	L23401
Journal	Geophysical Research Letters
Volume	33
Issue number	23
DOIs	https://doi.org/10.1029/2006GL028222
State	Published - Dec 16 2006

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title = "Seasonal changes in the age and structure of dissolved organic carbon in Siberian rivers and streams",

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.",

author = "Neff, {J. C.} and Finlay, {J. C.} and Zimov, {S. A.} and Davydov, {S. P.} and Carrasco, {J. J.} and Schuur, {E. A.G.} and Davydova, {A. I.}",

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AU - Neff, J. C.

AU - Finlay, J. C.

AU - Zimov, S. A.

AU - Davydov, S. P.

AU - Carrasco, J. J.

AU - Schuur, E. A.G.

AU - Davydova, A. I.

PY - 2006/12/16

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AB - 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.

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

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