Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins
Mobilization of Arctic permafrost carbon is expected to increase with warming-induced thawing. However, this effect is challenging to assess due to the diverse processes controlling the release of various organic carbon (OC) pools from heterogeneous Arctic landscapes. Here, by radiocarbon dating var...
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3761604 http://www.ncbi.nlm.nih.gov/pubmed/23940354 https://doi.org/10.1073/pnas.1307031110 |
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ftpubmed:oai:pubmedcentral.nih.gov:3761604 2023-05-15T14:36:27+02:00 Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins Feng, Xiaojuan Vonk, Jorien E. van Dongen, Bart E. Gustafsson, Örjan Semiletov, Igor P. Dudarev, Oleg V. Wang, Zhiheng Montluçon, Daniel B. Wacker, Lukas Eglinton, Timothy I. 2013-08-27 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3761604 http://www.ncbi.nlm.nih.gov/pubmed/23940354 https://doi.org/10.1073/pnas.1307031110 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3761604 http://www.ncbi.nlm.nih.gov/pubmed/23940354 http://dx.doi.org/10.1073/pnas.1307031110 Physical Sciences Text 2013 ftpubmed https://doi.org/10.1073/pnas.1307031110 2014-03-02T01:53:44Z Mobilization of Arctic permafrost carbon is expected to increase with warming-induced thawing. However, this effect is challenging to assess due to the diverse processes controlling the release of various organic carbon (OC) pools from heterogeneous Arctic landscapes. Here, by radiocarbon dating various terrestrial OC components in fluvially and coastally integrated estuarine sediments, we present a unique framework for deconvoluting the contrasting mobilization mechanisms of surface vs. deep (permafrost) carbon pools across the climosequence of the Eurasian Arctic. Vascular plant-derived lignin phenol 14C contents reveal significant inputs of young carbon from surface sources whose delivery is dominantly controlled by river runoff. In contrast, plant wax lipids predominantly trace ancient (permafrost) OC that is preferentially mobilized from discontinuous permafrost regions, where hydrological conduits penetrate deeper into soils and thermokarst erosion occurs more frequently. Because river runoff has significantly increased across the Eurasian Arctic in recent decades, we estimate from an isotopic mixing model that, in tandem with an increased transfer of young surface carbon, the proportion of mobilized terrestrial OC accounted for by ancient carbon has increased by 3–6% between 1985 and 2004. These findings suggest that although partly masked by surface carbon export, climate change-induced mobilization of old permafrost carbon is well underway in the Arctic. Text Arctic Climate change permafrost Thermokarst PubMed Central (PMC) Arctic Proceedings of the National Academy of Sciences 110 35 14168 14173 |
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PubMed Central (PMC) |
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language |
English |
topic |
Physical Sciences |
spellingShingle |
Physical Sciences Feng, Xiaojuan Vonk, Jorien E. van Dongen, Bart E. Gustafsson, Örjan Semiletov, Igor P. Dudarev, Oleg V. Wang, Zhiheng Montluçon, Daniel B. Wacker, Lukas Eglinton, Timothy I. Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins |
topic_facet |
Physical Sciences |
description |
Mobilization of Arctic permafrost carbon is expected to increase with warming-induced thawing. However, this effect is challenging to assess due to the diverse processes controlling the release of various organic carbon (OC) pools from heterogeneous Arctic landscapes. Here, by radiocarbon dating various terrestrial OC components in fluvially and coastally integrated estuarine sediments, we present a unique framework for deconvoluting the contrasting mobilization mechanisms of surface vs. deep (permafrost) carbon pools across the climosequence of the Eurasian Arctic. Vascular plant-derived lignin phenol 14C contents reveal significant inputs of young carbon from surface sources whose delivery is dominantly controlled by river runoff. In contrast, plant wax lipids predominantly trace ancient (permafrost) OC that is preferentially mobilized from discontinuous permafrost regions, where hydrological conduits penetrate deeper into soils and thermokarst erosion occurs more frequently. Because river runoff has significantly increased across the Eurasian Arctic in recent decades, we estimate from an isotopic mixing model that, in tandem with an increased transfer of young surface carbon, the proportion of mobilized terrestrial OC accounted for by ancient carbon has increased by 3–6% between 1985 and 2004. These findings suggest that although partly masked by surface carbon export, climate change-induced mobilization of old permafrost carbon is well underway in the Arctic. |
format |
Text |
author |
Feng, Xiaojuan Vonk, Jorien E. van Dongen, Bart E. Gustafsson, Örjan Semiletov, Igor P. Dudarev, Oleg V. Wang, Zhiheng Montluçon, Daniel B. Wacker, Lukas Eglinton, Timothy I. |
author_facet |
Feng, Xiaojuan Vonk, Jorien E. van Dongen, Bart E. Gustafsson, Örjan Semiletov, Igor P. Dudarev, Oleg V. Wang, Zhiheng Montluçon, Daniel B. Wacker, Lukas Eglinton, Timothy I. |
author_sort |
Feng, Xiaojuan |
title |
Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins |
title_short |
Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins |
title_full |
Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins |
title_fullStr |
Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins |
title_full_unstemmed |
Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins |
title_sort |
differential mobilization of terrestrial carbon pools in eurasian arctic river basins |
publisher |
National Academy of Sciences |
publishDate |
2013 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3761604 http://www.ncbi.nlm.nih.gov/pubmed/23940354 https://doi.org/10.1073/pnas.1307031110 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change permafrost Thermokarst |
genre_facet |
Arctic Climate change permafrost Thermokarst |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3761604 http://www.ncbi.nlm.nih.gov/pubmed/23940354 http://dx.doi.org/10.1073/pnas.1307031110 |
op_doi |
https://doi.org/10.1073/pnas.1307031110 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
110 |
container_issue |
35 |
container_start_page |
14168 |
op_container_end_page |
14173 |
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1766309060931485696 |