Assessing effects of permafrost thaw on C fluxes based on multiyear modeling across a permafrost thaw gradient at Stordalen, Sweden
Northern peatlands in permafrost regions contain a large amount of organic carbon (C) in the soil. Climate warming and associated permafrost degradation are expected to have significant impacts on the C balance of these ecosystems, but the magnitude is uncertain. We incorporated a permafrost model,...
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Online Access: | https://doi.org/10.5194/bg-11-4753-2014 https://www.biogeosciences.net/11/4753/2014/ |
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ftcopernicus:oai:publications.copernicus.org:bg24124 2023-05-15T17:55:19+02:00 Assessing effects of permafrost thaw on C fluxes based on multiyear modeling across a permafrost thaw gradient at Stordalen, Sweden Deng, J. Li, C. Frolking, S. Zhang, Y. Bäckstrand, K. Crill, P. 2018-09-27 application/pdf https://doi.org/10.5194/bg-11-4753-2014 https://www.biogeosciences.net/11/4753/2014/ eng eng doi:10.5194/bg-11-4753-2014 https://www.biogeosciences.net/11/4753/2014/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bg-11-4753-2014 2019-12-24T09:54:14Z Northern peatlands in permafrost regions contain a large amount of organic carbon (C) in the soil. Climate warming and associated permafrost degradation are expected to have significant impacts on the C balance of these ecosystems, but the magnitude is uncertain. We incorporated a permafrost model, Northern Ecosystem Soil Temperature (NEST), into a biogeochemical model, DeNitrification-DeComposition (DNDC), to model C dynamics in high-latitude peatland ecosystems. The enhanced model was applied to assess effects of permafrost thaw on C fluxes of a subarctic peatland at Stordalen, Sweden. DNDC simulated soil freeze–thaw dynamics, net ecosystem exchange of CO 2 (NEE), and CH 4 fluxes across three typical land cover types, which represent a gradient in the process of ongoing permafrost thaw at Stordalen. Model results were compared with multiyear field measurements, and the validation indicates that DNDC was able to simulate observed differences in seasonal soil thaw, NEE, and CH 4 fluxes across the three land cover types. Consistent with the results from field studies, the modeled C fluxes across the permafrost thaw gradient demonstrate that permafrost thaw and the associated changes in soil hydrology and vegetation not only increase net uptake of C from the atmosphere but also increase the annual to decadal radiative forcing impacts on climate due to increased CH 4 emissions. This study indicates the potential of utilizing biogeochemical models, such as DNDC, to predict the soil thermal regime in permafrost areas and to investigate impacts of permafrost thaw on ecosystem C fluxes after incorporating a permafrost component into the model framework. Text permafrost Subarctic Copernicus Publications: E-Journals Stordalen ENVELOPE(7.337,7.337,62.510,62.510) Biogeosciences 11 17 4753 4770 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Northern peatlands in permafrost regions contain a large amount of organic carbon (C) in the soil. Climate warming and associated permafrost degradation are expected to have significant impacts on the C balance of these ecosystems, but the magnitude is uncertain. We incorporated a permafrost model, Northern Ecosystem Soil Temperature (NEST), into a biogeochemical model, DeNitrification-DeComposition (DNDC), to model C dynamics in high-latitude peatland ecosystems. The enhanced model was applied to assess effects of permafrost thaw on C fluxes of a subarctic peatland at Stordalen, Sweden. DNDC simulated soil freeze–thaw dynamics, net ecosystem exchange of CO 2 (NEE), and CH 4 fluxes across three typical land cover types, which represent a gradient in the process of ongoing permafrost thaw at Stordalen. Model results were compared with multiyear field measurements, and the validation indicates that DNDC was able to simulate observed differences in seasonal soil thaw, NEE, and CH 4 fluxes across the three land cover types. Consistent with the results from field studies, the modeled C fluxes across the permafrost thaw gradient demonstrate that permafrost thaw and the associated changes in soil hydrology and vegetation not only increase net uptake of C from the atmosphere but also increase the annual to decadal radiative forcing impacts on climate due to increased CH 4 emissions. This study indicates the potential of utilizing biogeochemical models, such as DNDC, to predict the soil thermal regime in permafrost areas and to investigate impacts of permafrost thaw on ecosystem C fluxes after incorporating a permafrost component into the model framework. |
format |
Text |
author |
Deng, J. Li, C. Frolking, S. Zhang, Y. Bäckstrand, K. Crill, P. |
spellingShingle |
Deng, J. Li, C. Frolking, S. Zhang, Y. Bäckstrand, K. Crill, P. Assessing effects of permafrost thaw on C fluxes based on multiyear modeling across a permafrost thaw gradient at Stordalen, Sweden |
author_facet |
Deng, J. Li, C. Frolking, S. Zhang, Y. Bäckstrand, K. Crill, P. |
author_sort |
Deng, J. |
title |
Assessing effects of permafrost thaw on C fluxes based on multiyear modeling across a permafrost thaw gradient at Stordalen, Sweden |
title_short |
Assessing effects of permafrost thaw on C fluxes based on multiyear modeling across a permafrost thaw gradient at Stordalen, Sweden |
title_full |
Assessing effects of permafrost thaw on C fluxes based on multiyear modeling across a permafrost thaw gradient at Stordalen, Sweden |
title_fullStr |
Assessing effects of permafrost thaw on C fluxes based on multiyear modeling across a permafrost thaw gradient at Stordalen, Sweden |
title_full_unstemmed |
Assessing effects of permafrost thaw on C fluxes based on multiyear modeling across a permafrost thaw gradient at Stordalen, Sweden |
title_sort |
assessing effects of permafrost thaw on c fluxes based on multiyear modeling across a permafrost thaw gradient at stordalen, sweden |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-11-4753-2014 https://www.biogeosciences.net/11/4753/2014/ |
long_lat |
ENVELOPE(7.337,7.337,62.510,62.510) |
geographic |
Stordalen |
geographic_facet |
Stordalen |
genre |
permafrost Subarctic |
genre_facet |
permafrost Subarctic |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-11-4753-2014 https://www.biogeosciences.net/11/4753/2014/ |
op_doi |
https://doi.org/10.5194/bg-11-4753-2014 |
container_title |
Biogeosciences |
container_volume |
11 |
container_issue |
17 |
container_start_page |
4753 |
op_container_end_page |
4770 |
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1766163234114502656 |