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| Titel |
A simplified permafrost-carbon model for long-term climate studies with the CLIMBER-2 coupled earth system model |
| VerfasserIn |
K. A. Crichton, D. M. Roche, G. Krinner, J. Chappellaz |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 7, no. 6 ; Nr. 7, no. 6 (2014-12-18), S.3111-3134 |
| Datensatznummer |
250115802
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| Publikation (Nr.) |
 copernicus.org/gmd-7-3111-2014.pdf |
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| Zusammenfassung |
| 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. |
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