Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins
Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences of the United States...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/6180 2023-05-15T14:46:08+02:00 Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins Feng, Xiaojuan Vonk, Jorien E. van Dongen, Bart E. Gustafsson, Orjan Semiletov, Igor P. Dudarev, Oleg V. Wang, Zhiheng Montlucon, Daniel B. Wacker, Lukas Eglinton, Timothy I. 2013-07 application/pdf https://hdl.handle.net/1912/6180 en_US eng https://doi.org/10.1073/pnas.1307031110 https://hdl.handle.net/1912/6180 Fluvial mobilization Compound-specific 14C Hydrogeographic control Preprint 2013 ftwhoas https://doi.org/10.1073/pnas.1307031110 2022-05-28T22:58:56Z Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences of the United States of America 110 (2013): 14168–14173, doi:10.1073/pnas.1307031110. 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 versus 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. As 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 1985-2004. These findings suggest that, while partly masked by surface-carbon export, climate-change-induced mobilization of old permafrost carbon is well under way in the Arctic. The ISSS program is supported by the Knut and Alice Wallenberg Foundation, the Far Eastern Branch of the Russian Academy of Sciences, the Swedish Research Council, the US National Oceanic and ... Report Arctic Climate change permafrost Thermokarst Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Proceedings of the National Academy of Sciences 110 35 14168 14173 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Fluvial mobilization Compound-specific 14C Hydrogeographic control |
spellingShingle |
Fluvial mobilization Compound-specific 14C Hydrogeographic control Feng, Xiaojuan Vonk, Jorien E. van Dongen, Bart E. Gustafsson, Orjan Semiletov, Igor P. Dudarev, Oleg V. Wang, Zhiheng Montlucon, Daniel B. Wacker, Lukas Eglinton, Timothy I. Differential mobilization of terrestrial carbon pools in Eurasian Arctic river basins |
topic_facet |
Fluvial mobilization Compound-specific 14C Hydrogeographic control |
description |
Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences of the United States of America 110 (2013): 14168–14173, doi:10.1073/pnas.1307031110. 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 versus 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. As 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 1985-2004. These findings suggest that, while partly masked by surface-carbon export, climate-change-induced mobilization of old permafrost carbon is well under way in the Arctic. The ISSS program is supported by the Knut and Alice Wallenberg Foundation, the Far Eastern Branch of the Russian Academy of Sciences, the Swedish Research Council, the US National Oceanic and ... |
format |
Report |
author |
Feng, Xiaojuan Vonk, Jorien E. van Dongen, Bart E. Gustafsson, Orjan Semiletov, Igor P. Dudarev, Oleg V. Wang, Zhiheng Montlucon, Daniel B. Wacker, Lukas Eglinton, Timothy I. |
author_facet |
Feng, Xiaojuan Vonk, Jorien E. van Dongen, Bart E. Gustafsson, Orjan Semiletov, Igor P. Dudarev, Oleg V. Wang, Zhiheng Montlucon, 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 |
publishDate |
2013 |
url |
https://hdl.handle.net/1912/6180 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change permafrost Thermokarst |
genre_facet |
Arctic Climate change permafrost Thermokarst |
op_relation |
https://doi.org/10.1073/pnas.1307031110 https://hdl.handle.net/1912/6180 |
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 |
_version_ |
1766317392189718528 |