Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw
Permafrost peatlands are biogeochemical hot spots in the Arctic as they store vast amounts of carbon. Permafrost thaw could release part of these long-term immobile carbon stocks as the greenhouse gases (GHGs) carbon dioxide (CO2) and methane (CH4) to the atmosphere, but how much, at which time-span...
Published in: | Global Change Biology |
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Main Authors: | , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
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2019
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Online Access: | https://pure.au.dk/portal/en/publications/1cfb8e7e-f652-4872-9277-3f4f048ead19 https://doi.org/10.1111/gcb.14574 http://www.scopus.com/inward/record.url?scp=85061985477&partnerID=8YFLogxK |
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ftuniaarhuspubl:oai:pure.atira.dk:publications/1cfb8e7e-f652-4872-9277-3f4f048ead19 2024-02-11T09:59:39+01:00 Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw Voigt, Carolina Marushchak, Maija E. Mastepanov, Mikhail Lamprecht, Richard E. Christensen, Torben R. Dorodnikov, Maxim Jackowicz-Korczyński, Marcin Lindgren, Amelie Lohila, Annalea Nykänen, Hannu Oinonen, Markku Oksanen, Timo Palonen, Vesa Treat, Claire C. Martikainen, Pertti J. Biasi, Christina 2019-05 https://pure.au.dk/portal/en/publications/1cfb8e7e-f652-4872-9277-3f4f048ead19 https://doi.org/10.1111/gcb.14574 http://www.scopus.com/inward/record.url?scp=85061985477&partnerID=8YFLogxK eng eng https://pure.au.dk/portal/en/publications/1cfb8e7e-f652-4872-9277-3f4f048ead19 info:eu-repo/semantics/restrictedAccess Voigt , C , Marushchak , M E , Mastepanov , M , Lamprecht , R E , Christensen , T R , Dorodnikov , M , Jackowicz-Korczyński , M , Lindgren , A , Lohila , A , Nykänen , H , Oinonen , M , Oksanen , T , Palonen , V , Treat , C C , Martikainen , P J & Biasi , C 2019 , ' Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw ' , Global Change Biology , vol. 25 , no. 5 , pp. 1746-1764 . https://doi.org/10.1111/gcb.14574 climate warming CO greenhouse gas mesocosm methane oxidation permafrost-carbon-feedback PALSA MIRE NORTHERN PEATLANDS CO2 ORGANIC-MATTER CLIMATE-CHANGE CO2 EXCHANGE CH4 FLUXES METHANE EMISSIONS WATER-TABLE TUNDRA SOILS EXTRACTION METHOD article 2019 ftuniaarhuspubl https://doi.org/10.1111/gcb.14574 2024-01-18T00:00:05Z Permafrost peatlands are biogeochemical hot spots in the Arctic as they store vast amounts of carbon. Permafrost thaw could release part of these long-term immobile carbon stocks as the greenhouse gases (GHGs) carbon dioxide (CO2) and methane (CH4) to the atmosphere, but how much, at which time-span and as which gaseous carbon species is still highly uncertain. Here we assess the effect of permafrost thaw on GHG dynamics under different moisture and vegetation scenarios in a permafrost peatland. A novel experimental approach using intact plant-soil systems (mesocosms) allowed us to simulate permafrost thaw under near-natural conditions. We monitored GHG flux dynamics via high-resolution flow-through gas measurements, combined with detailed monitoring of soil GHG concentration dynamics, yielding insights into GHG production and consumption potential of individual soil layers. Thawing the upper 10-15 cm of permafrost under dry conditions increased CO2 emissions to the atmosphere (without vegetation: 0.74 +/- 0.49 vs. 0.84 +/- 0.60 g CO2-C m(-2) day(-1); with vegetation: 1.20 +/- 0.50 vs. 1.32 +/- 0.60 g CO2-C m(-2) day(-1), mean +/- SD, pre- and post-thaw, respectively). Radiocarbon dating (C-14) of respired CO2, supported by an independent curve-fitting approach, showed a clear contribution (9%-27%) of old carbon to this enhanced post-thaw CO2 flux. Elevated concentrations of CO2, CH4, and dissolved organic carbon at depth indicated not just pulse emissions during the thawing process, but sustained decomposition and GHG production from thawed permafrost. Oxidation of CH4 in the peat column, however, prevented CH4 release to the atmosphere. Importantly, we show here that, under dry conditions, peatlands strengthen the permafrost-carbon feedback by adding to the atmospheric CO2 burden post-thaw. However, as long as the water table remains low, our results reveal a strong CH4 sink capacity in these types of Arctic ecosystems pre- and post-thaw, with the potential to compensate part of the permafrost CO2 losses over ... Article in Journal/Newspaper Arctic Arctic Climate change palsa permafrost Tundra Aarhus University: Research Arctic Global Change Biology 25 5 1746 1764 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
climate warming CO greenhouse gas mesocosm methane oxidation permafrost-carbon-feedback PALSA MIRE NORTHERN PEATLANDS CO2 ORGANIC-MATTER CLIMATE-CHANGE CO2 EXCHANGE CH4 FLUXES METHANE EMISSIONS WATER-TABLE TUNDRA SOILS EXTRACTION METHOD |
spellingShingle |
climate warming CO greenhouse gas mesocosm methane oxidation permafrost-carbon-feedback PALSA MIRE NORTHERN PEATLANDS CO2 ORGANIC-MATTER CLIMATE-CHANGE CO2 EXCHANGE CH4 FLUXES METHANE EMISSIONS WATER-TABLE TUNDRA SOILS EXTRACTION METHOD Voigt, Carolina Marushchak, Maija E. Mastepanov, Mikhail Lamprecht, Richard E. Christensen, Torben R. Dorodnikov, Maxim Jackowicz-Korczyński, Marcin Lindgren, Amelie Lohila, Annalea Nykänen, Hannu Oinonen, Markku Oksanen, Timo Palonen, Vesa Treat, Claire C. Martikainen, Pertti J. Biasi, Christina Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw |
topic_facet |
climate warming CO greenhouse gas mesocosm methane oxidation permafrost-carbon-feedback PALSA MIRE NORTHERN PEATLANDS CO2 ORGANIC-MATTER CLIMATE-CHANGE CO2 EXCHANGE CH4 FLUXES METHANE EMISSIONS WATER-TABLE TUNDRA SOILS EXTRACTION METHOD |
description |
Permafrost peatlands are biogeochemical hot spots in the Arctic as they store vast amounts of carbon. Permafrost thaw could release part of these long-term immobile carbon stocks as the greenhouse gases (GHGs) carbon dioxide (CO2) and methane (CH4) to the atmosphere, but how much, at which time-span and as which gaseous carbon species is still highly uncertain. Here we assess the effect of permafrost thaw on GHG dynamics under different moisture and vegetation scenarios in a permafrost peatland. A novel experimental approach using intact plant-soil systems (mesocosms) allowed us to simulate permafrost thaw under near-natural conditions. We monitored GHG flux dynamics via high-resolution flow-through gas measurements, combined with detailed monitoring of soil GHG concentration dynamics, yielding insights into GHG production and consumption potential of individual soil layers. Thawing the upper 10-15 cm of permafrost under dry conditions increased CO2 emissions to the atmosphere (without vegetation: 0.74 +/- 0.49 vs. 0.84 +/- 0.60 g CO2-C m(-2) day(-1); with vegetation: 1.20 +/- 0.50 vs. 1.32 +/- 0.60 g CO2-C m(-2) day(-1), mean +/- SD, pre- and post-thaw, respectively). Radiocarbon dating (C-14) of respired CO2, supported by an independent curve-fitting approach, showed a clear contribution (9%-27%) of old carbon to this enhanced post-thaw CO2 flux. Elevated concentrations of CO2, CH4, and dissolved organic carbon at depth indicated not just pulse emissions during the thawing process, but sustained decomposition and GHG production from thawed permafrost. Oxidation of CH4 in the peat column, however, prevented CH4 release to the atmosphere. Importantly, we show here that, under dry conditions, peatlands strengthen the permafrost-carbon feedback by adding to the atmospheric CO2 burden post-thaw. However, as long as the water table remains low, our results reveal a strong CH4 sink capacity in these types of Arctic ecosystems pre- and post-thaw, with the potential to compensate part of the permafrost CO2 losses over ... |
format |
Article in Journal/Newspaper |
author |
Voigt, Carolina Marushchak, Maija E. Mastepanov, Mikhail Lamprecht, Richard E. Christensen, Torben R. Dorodnikov, Maxim Jackowicz-Korczyński, Marcin Lindgren, Amelie Lohila, Annalea Nykänen, Hannu Oinonen, Markku Oksanen, Timo Palonen, Vesa Treat, Claire C. Martikainen, Pertti J. Biasi, Christina |
author_facet |
Voigt, Carolina Marushchak, Maija E. Mastepanov, Mikhail Lamprecht, Richard E. Christensen, Torben R. Dorodnikov, Maxim Jackowicz-Korczyński, Marcin Lindgren, Amelie Lohila, Annalea Nykänen, Hannu Oinonen, Markku Oksanen, Timo Palonen, Vesa Treat, Claire C. Martikainen, Pertti J. Biasi, Christina |
author_sort |
Voigt, Carolina |
title |
Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw |
title_short |
Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw |
title_full |
Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw |
title_fullStr |
Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw |
title_full_unstemmed |
Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw |
title_sort |
ecosystem carbon response of an arctic peatland to simulated permafrost thaw |
publishDate |
2019 |
url |
https://pure.au.dk/portal/en/publications/1cfb8e7e-f652-4872-9277-3f4f048ead19 https://doi.org/10.1111/gcb.14574 http://www.scopus.com/inward/record.url?scp=85061985477&partnerID=8YFLogxK |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Climate change palsa permafrost Tundra |
genre_facet |
Arctic Arctic Climate change palsa permafrost Tundra |
op_source |
Voigt , C , Marushchak , M E , Mastepanov , M , Lamprecht , R E , Christensen , T R , Dorodnikov , M , Jackowicz-Korczyński , M , Lindgren , A , Lohila , A , Nykänen , H , Oinonen , M , Oksanen , T , Palonen , V , Treat , C C , Martikainen , P J & Biasi , C 2019 , ' Ecosystem carbon response of an Arctic peatland to simulated permafrost thaw ' , Global Change Biology , vol. 25 , no. 5 , pp. 1746-1764 . https://doi.org/10.1111/gcb.14574 |
op_relation |
https://pure.au.dk/portal/en/publications/1cfb8e7e-f652-4872-9277-3f4f048ead19 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1111/gcb.14574 |
container_title |
Global Change Biology |
container_volume |
25 |
container_issue |
5 |
container_start_page |
1746 |
op_container_end_page |
1764 |
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1790595451018280960 |