Age and chemistry of dissolved organic carbon reveal enhanced leaching of ancient labile carbon at the permafrost thaw zone

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Abstract 14 C) of DOC and assessed DOC composition with ultraviolet–visible spectroscopy (UV–Vis) of surface waters and shallow and deep subsurface porewaters from 17 drainages in the Barrow Environmental Observatory in Alaska. Samples were collected in July and September 2013 to assess changes in age and chemistry of DOC over time. DOC age was highly variable ranging from modern (19 ‰ Δ 14 - Δ 14 δ 13 C, and the apparent fractionation factor), suggesting a coupling between carbon and redox biogeochemistry influencing methane production. In the drained thawed lake basins included in this study, DOC concentrations and contributions of vegetation-derived organic matter declined with increasing basin age. The weak relationship between DOC age and chemistry and consistency in DOC chemical indicators over the summer suggest a high lability of old DOC released by thawing permafrost.

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Bibliographic citation: Age and chemistry of dissolved organic carbon reveal enhanced leaching of ancient labile carbon at the permafrost thaw zone ; volume:19 ; number:4 ; year:2022 ; pages:1211-1223 ; extent:13
Biogeosciences ; 19, Heft 4 (2022), 1211-1223 (gesamt 13)

Creator: McFarlane, Karis J.
Throckmorton, Heather M.
Heikoop, Jeffrey M.
Newman, Brent D.
Hedgpeth, Alexandra L.
Repasch, Marisa
Guilderson, Thomas P.
Wilson, Cathy J.

DOI: 10.5194/bg-19-1211-2022

URN: urn:nbn:de:101:1-2022030304221134559021

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 15.08.2025, 7:23 AM CEST

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McFarlane, Karis J.
Throckmorton, Heather M.
Heikoop, Jeffrey M.
Newman, Brent D.
Hedgpeth, Alexandra L.
Repasch, Marisa
Guilderson, Thomas P.
Wilson, Cathy J.

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Age and chemistry of dissolved organic carbon reveal enhanced leaching of ancient labile carbon at the permafrost thaw zone

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Other Objects (12)

21st-century modeled permafrost carbon emissions accelerated by abrupt thaw beneath lakes

Iron mineral dissolution releases iron and associated organic carbon during permafrost thaw

Divergent changes in particulate and mineral-associated organic carbon upon permafrost thaw

Warming-induced permafrost thaw exacerbates tundra soil carbon decomposition mediated by microbial community

Emissions from thaw ponds largely offset the carbon sink of northern permafrost wetlands

Nitrogen availability regulates topsoil carbon dynamics after permafrost thaw by altering microbial metabolic efficiency

Large carbon cycle sensitivities to climate across a permafrost thaw gradient in subarctic Sweden

Adding labile carbon to peatland soils triggers deep carbon breakdown

Identity of Iron-Carbon Associations across a Permafrost Thaw Gradient and their Contribution to Greenhouse Gas Release

Methanotrophy across a natural permafrost thaw environment

Transition Metal to Carbon Bonds - Stable and Labile

Partitioning carbon fluxes in a permafrost landscape

21st-century modeled permafrost carbon emissions accelerated by abrupt thaw beneath lakes

Iron mineral dissolution releases iron and associated organic carbon during permafrost thaw

Divergent changes in particulate and mineral-associated organic carbon upon permafrost thaw

Warming-induced permafrost thaw exacerbates tundra soil carbon decomposition mediated by microbial community

Emissions from thaw ponds largely offset the carbon sink of northern permafrost wetlands

Nitrogen availability regulates topsoil carbon dynamics after permafrost thaw by altering microbial metabolic efficiency

Large carbon cycle sensitivities to climate across a permafrost thaw gradient in subarctic Sweden

Adding labile carbon to peatland soils triggers deep carbon breakdown

Identity of Iron-Carbon Associations across a Permafrost Thaw Gradient and their Contribution to Greenhouse Gas Release

Methanotrophy across a natural permafrost thaw environment

Transition Metal to Carbon Bonds - Stable and Labile

Partitioning carbon fluxes in a permafrost landscape

21st-century modeled permafrost carbon emissions accelerated by abrupt thaw beneath lakes

Iron mineral dissolution releases iron and associated organic carbon during permafrost thaw

Divergent changes in particulate and mineral-associated organic carbon upon permafrost thaw

Warming-induced permafrost thaw exacerbates tundra soil carbon decomposition mediated by microbial community

Emissions from thaw ponds largely offset the carbon sink of northern permafrost wetlands

Nitrogen availability regulates topsoil carbon dynamics after permafrost thaw by altering microbial metabolic efficiency

Large carbon cycle sensitivities to climate across a permafrost thaw gradient in subarctic Sweden

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Transition Metal to Carbon Bonds - Stable and Labile

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