A simplified permafrost-carbon model for long-term climate studies with the CLIMBER-2 coupled earth system model
We present the development and validation of a simplified permafrost-carbon mechanism for use with the land surface scheme operating in the CLIMBER-2 earth system model. The simplified model estimates the permafrost fraction of each grid cell according to the balance between modelled cold (below 0 °...
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ftcopernicus:oai:publications.copernicus.org:gmd26069 2023-05-15T17:55:27+02:00 A simplified permafrost-carbon model for long-term climate studies with the CLIMBER-2 coupled earth system model Crichton, K. A. Roche, D. M. Krinner, G. Chappellaz, J. 2018-09-27 application/pdf https://doi.org/10.5194/gmd-7-3111-2014 https://gmd.copernicus.org/articles/7/3111/2014/ eng eng doi:10.5194/gmd-7-3111-2014 https://gmd.copernicus.org/articles/7/3111/2014/ eISSN: 1991-9603 Text 2018 ftcopernicus https://doi.org/10.5194/gmd-7-3111-2014 2020-07-20T16:24:50Z We present the development and validation of a simplified permafrost-carbon mechanism for use with the land surface scheme operating in the CLIMBER-2 earth system model. The simplified model estimates the permafrost fraction of each grid cell according to the balance between modelled cold (below 0 °C) and warm (above 0 °C) days in a year. Areas diagnosed as permafrost are assigned a reduction in soil decomposition rate, thus creating a slow accumulating soil carbon pool. In warming climates, permafrost extent reduces and soil decomposition rates increase, resulting in soil carbon release to the atmosphere. Four accumulation/decomposition rate settings are retained for experiments within the CLIMBER-2(P) model, which are tuned to agree with estimates of total land carbon stocks today and at the last glacial maximum. The distribution of this permafrost-carbon pool is in broad agreement with measurement data for soil carbon content. The level of complexity of the permafrost-carbon model is comparable to other components in the CLIMBER-2 earth system model. Text permafrost Copernicus Publications: E-Journals Geoscientific Model Development 7 6 3111 3134 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
We present the development and validation of a simplified permafrost-carbon mechanism for use with the land surface scheme operating in the CLIMBER-2 earth system model. The simplified model estimates the permafrost fraction of each grid cell according to the balance between modelled cold (below 0 °C) and warm (above 0 °C) days in a year. Areas diagnosed as permafrost are assigned a reduction in soil decomposition rate, thus creating a slow accumulating soil carbon pool. In warming climates, permafrost extent reduces and soil decomposition rates increase, resulting in soil carbon release to the atmosphere. Four accumulation/decomposition rate settings are retained for experiments within the CLIMBER-2(P) model, which are tuned to agree with estimates of total land carbon stocks today and at the last glacial maximum. The distribution of this permafrost-carbon pool is in broad agreement with measurement data for soil carbon content. The level of complexity of the permafrost-carbon model is comparable to other components in the CLIMBER-2 earth system model. |
format |
Text |
author |
Crichton, K. A. Roche, D. M. Krinner, G. Chappellaz, J. |
spellingShingle |
Crichton, K. A. Roche, D. M. Krinner, G. Chappellaz, J. A simplified permafrost-carbon model for long-term climate studies with the CLIMBER-2 coupled earth system model |
author_facet |
Crichton, K. A. Roche, D. M. Krinner, G. Chappellaz, J. |
author_sort |
Crichton, K. A. |
title |
A simplified permafrost-carbon model for long-term climate studies with the CLIMBER-2 coupled earth system model |
title_short |
A simplified permafrost-carbon model for long-term climate studies with the CLIMBER-2 coupled earth system model |
title_full |
A simplified permafrost-carbon model for long-term climate studies with the CLIMBER-2 coupled earth system model |
title_fullStr |
A simplified permafrost-carbon model for long-term climate studies with the CLIMBER-2 coupled earth system model |
title_full_unstemmed |
A simplified permafrost-carbon model for long-term climate studies with the CLIMBER-2 coupled earth system model |
title_sort |
simplified permafrost-carbon model for long-term climate studies with the climber-2 coupled earth system model |
publishDate |
2018 |
url |
https://doi.org/10.5194/gmd-7-3111-2014 https://gmd.copernicus.org/articles/7/3111/2014/ |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
eISSN: 1991-9603 |
op_relation |
doi:10.5194/gmd-7-3111-2014 https://gmd.copernicus.org/articles/7/3111/2014/ |
op_doi |
https://doi.org/10.5194/gmd-7-3111-2014 |
container_title |
Geoscientific Model Development |
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7 |
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6 |
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3111 |
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3134 |
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1766163393162510336 |