Thawing Permafrost as a Nitrogen Fertiliser: Implications for Climate Feedbacks
Studies for the northern high latitudes suggest that, in the near term, increased vegetation uptake may offset permafrost carbon losses, but over longer time periods, permafrost carbon decomposition causes a net loss of carbon. Here, we assess the impact of a coupled carbon and nitrogen cycle on the...
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ftmdpi:oai:mdpi.com:/2504-3129/3/2/23/ 2023-08-20T04:04:54+02:00 Thawing Permafrost as a Nitrogen Fertiliser: Implications for Climate Feedbacks Eleanor Burke Sarah Chadburn Chris Huntingford agris 2022-06-03 application/pdf https://doi.org/10.3390/nitrogen3020023 EN eng Multidisciplinary Digital Publishing Institute https://dx.doi.org/10.3390/nitrogen3020023 https://creativecommons.org/licenses/by/4.0/ Nitrogen; Volume 3; Issue 2; Pages: 353-375 permafrost nitrogen climate feedback carbon feedback earth system model carbon soils nitrogen cycle carbon cycle Text 2022 ftmdpi https://doi.org/10.3390/nitrogen3020023 2023-08-01T05:16:10Z Studies for the northern high latitudes suggest that, in the near term, increased vegetation uptake may offset permafrost carbon losses, but over longer time periods, permafrost carbon decomposition causes a net loss of carbon. Here, we assess the impact of a coupled carbon and nitrogen cycle on the simulations of these carbon fluxes. We present results from JULES-IMOGEN—a global land surface model coupled to an intermediate complexity climate model with vertically resolved soil biogeochemistry. We quantify the impact of nitrogen fertilisation from thawing permafrost on the carbon cycle and compare it with the loss of permafrost carbon. Projections show that the additional fertilisation reduces the high latitude vegetation nitrogen limitation and causes an overall increase in vegetation carbon uptake. This is a few Petagrams of carbon (Pg C) by year 2100, increasing to up to 40 Pg C by year 2300 for the RCP8.5 concentration scenario and adds around 50% to the projected overall increase in vegetation carbon in that region. This nitrogen fertilisation results in a negative (stabilising) feedback on the global mean temperature, which could be equivalent in magnitude to the positive (destabilising) temperature feedback from the loss of permafrost carbon. This balance depends on the future scenario and initial permafrost carbon. JULES-IMOGEN describes one representation of the changes in Arctic carbon and nitrogen cycling in response to climate change. However there are uncertainties in the modelling framework, model parameterisation and missing processes which, when assessed, will provide a more complete picture of the balance between stabilising and destabilising feedbacks. Text Arctic Climate change permafrost MDPI Open Access Publishing Arctic Jules ENVELOPE(140.917,140.917,-66.742,-66.742) Nitrogen 3 2 353 375 |
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Open Polar |
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MDPI Open Access Publishing |
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ftmdpi |
language |
English |
topic |
permafrost nitrogen climate feedback carbon feedback earth system model carbon soils nitrogen cycle carbon cycle |
spellingShingle |
permafrost nitrogen climate feedback carbon feedback earth system model carbon soils nitrogen cycle carbon cycle Eleanor Burke Sarah Chadburn Chris Huntingford Thawing Permafrost as a Nitrogen Fertiliser: Implications for Climate Feedbacks |
topic_facet |
permafrost nitrogen climate feedback carbon feedback earth system model carbon soils nitrogen cycle carbon cycle |
description |
Studies for the northern high latitudes suggest that, in the near term, increased vegetation uptake may offset permafrost carbon losses, but over longer time periods, permafrost carbon decomposition causes a net loss of carbon. Here, we assess the impact of a coupled carbon and nitrogen cycle on the simulations of these carbon fluxes. We present results from JULES-IMOGEN—a global land surface model coupled to an intermediate complexity climate model with vertically resolved soil biogeochemistry. We quantify the impact of nitrogen fertilisation from thawing permafrost on the carbon cycle and compare it with the loss of permafrost carbon. Projections show that the additional fertilisation reduces the high latitude vegetation nitrogen limitation and causes an overall increase in vegetation carbon uptake. This is a few Petagrams of carbon (Pg C) by year 2100, increasing to up to 40 Pg C by year 2300 for the RCP8.5 concentration scenario and adds around 50% to the projected overall increase in vegetation carbon in that region. This nitrogen fertilisation results in a negative (stabilising) feedback on the global mean temperature, which could be equivalent in magnitude to the positive (destabilising) temperature feedback from the loss of permafrost carbon. This balance depends on the future scenario and initial permafrost carbon. JULES-IMOGEN describes one representation of the changes in Arctic carbon and nitrogen cycling in response to climate change. However there are uncertainties in the modelling framework, model parameterisation and missing processes which, when assessed, will provide a more complete picture of the balance between stabilising and destabilising feedbacks. |
format |
Text |
author |
Eleanor Burke Sarah Chadburn Chris Huntingford |
author_facet |
Eleanor Burke Sarah Chadburn Chris Huntingford |
author_sort |
Eleanor Burke |
title |
Thawing Permafrost as a Nitrogen Fertiliser: Implications for Climate Feedbacks |
title_short |
Thawing Permafrost as a Nitrogen Fertiliser: Implications for Climate Feedbacks |
title_full |
Thawing Permafrost as a Nitrogen Fertiliser: Implications for Climate Feedbacks |
title_fullStr |
Thawing Permafrost as a Nitrogen Fertiliser: Implications for Climate Feedbacks |
title_full_unstemmed |
Thawing Permafrost as a Nitrogen Fertiliser: Implications for Climate Feedbacks |
title_sort |
thawing permafrost as a nitrogen fertiliser: implications for climate feedbacks |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2022 |
url |
https://doi.org/10.3390/nitrogen3020023 |
op_coverage |
agris |
long_lat |
ENVELOPE(140.917,140.917,-66.742,-66.742) |
geographic |
Arctic Jules |
geographic_facet |
Arctic Jules |
genre |
Arctic Climate change permafrost |
genre_facet |
Arctic Climate change permafrost |
op_source |
Nitrogen; Volume 3; Issue 2; Pages: 353-375 |
op_relation |
https://dx.doi.org/10.3390/nitrogen3020023 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/nitrogen3020023 |
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Nitrogen |
container_volume |
3 |
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2 |
container_start_page |
353 |
op_container_end_page |
375 |
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