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| Titel |
Bergen Earth system model (BCM-C): model description and regional climate-carbon cycle feedbacks assessment |
| VerfasserIn |
J. F. Tjiputra, K. Assmann, M. Bentsen, I. Bethke, O. H. Otterå, C. Sturm, C. Heinze |
| 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 ; 3, no. 1 ; Nr. 3, no. 1 (2010-02-12), S.123-141 |
| Datensatznummer |
250000798
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| Publikation (Nr.) |
 copernicus.org/gmd-3-123-2010.pdf |
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| Zusammenfassung |
| We developed a complex Earth system model by coupling terrestrial and oceanic
carbon cycle components into the Bergen Climate Model. For this study, we
have generated two model simulations (one with climate change inclusions and
the other without) to study the large scale climate and carbon cycle
variability as well as its feedback for the period 1850–2100. The
simulations are performed based on historical and future IPCC CO2 emission
scenarios. Globally, a pronounced positive climate-carbon cycle feedback is
simulated by the terrestrial carbon cycle model, but smaller signals are
shown by the oceanic counterpart. Over land, the regional climate-carbon
cycle feedback is highlighted by increased soil respiration, which exceeds
the enhanced production due to the atmospheric CO2 fertilization effect,
in the equatorial and northern hemisphere mid-latitude regions. For the
ocean, our analysis indicates that there are substantial temporal and spatial
variations in climate impact on the air-sea CO2 fluxes. This implies
feedback mechanisms act inhomogeneously in different ocean regions. In the
North Atlantic subpolar gyre, the simulated future cooling of SST improves
the CO2 gas solubility in seawater and, hence, reduces the strength of
positive climate carbon cycle feedback in this region. In most ocean regions,
the changes in the Revelle factor is dominated by changes in surface
pCO2, and not by the warming of SST. Therefore, the
solubility-associated positive feedback is more prominent than the buffer
capacity feedback. In our climate change simulation, the retreat of Southern
Ocean sea ice due to melting allows an additional ~20 Pg C uptake as
compared to the simulation without climate change. |
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