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| Titel |
Response of microbial decomposition to spin-up explains CMIP5 soil carbon range until 2100 |
| VerfasserIn |
J.-F. Exbrayat, A. J. Pitman, G. Abramowitz |
| 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 (2014-11-13), S.2683-2692 |
| Datensatznummer |
250115778
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| Publikation (Nr.) |
 copernicus.org/gmd-7-2683-2014.pdf |
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| Zusammenfassung |
| Soil carbon storage simulated by the Coupled Model Intercomparison Project
(CMIP5) models varies 6-fold for the present day. Here, we confirm earlier
work showing that this range already exists at the beginning of the CMIP5 historical
simulations. We additionally show that this range is largely determined by
the response of microbial decomposition during each model's spin-up procedure
from initialization to equilibration. The 6-fold range in soil carbon, once
established prior to the beginning of the historical period (and prior to the
beginning of a CMIP5 simulation), is then maintained through the present and
to 2100 almost unchanged even under a strong business-as-usual emissions
scenario. We therefore highlight that a commonly ignored part of CMIP5
analyses – the land surface state achieved through the spin-up procedure –
can be important for determining future carbon storage and land surface
fluxes. We identify the need to better constrain the outcome of the spin-up
procedure as an important step in reducing uncertainty in both projected soil
carbon and land surface fluxes in CMIP5 transient simulations. |
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