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The Climate Sensitivity of the Community Climate System Model Version 3 (CCSM3)

Kiehl, Jeffrey T., Shields, Christine A., Hack, James J., Collins, William D.·2006·Journal of Climate

Abstract

The climate sensitivity of the Community Climate System Model (CCSM) is described in terms of the equilibrium change in surface temperature due to a doubling of carbon dioxide in a slab ocean version of the Community Atmosphere Model (CAM) and the transient climate response, which is the surface temperature change at the point of doubling of carbon dioxide in a 1% yr−1 CO2 simulation with the fully coupled CCSM. For a fixed atmospheric horizontal resolution across model versions, we show that the equilibrium sensitivity has monotonically increased across CSM1.4, CCSM2, to CCSM3 from 2.01° to 2.27° to 2.47°C, respectively. The transient climate response for these versions is 1.44° to 1.09° to 1.48°C, respectively. Using climate feedback analysis, it is shown that both clear-sky and cloudy-sky processes have contributed to the changes in transient climate response. The dependence of these sensitivities on horizontal resolution is also explored. The equilibrium sensitivity of the high-resolution (T85) version of CCSM3 is 2.71°C, while the equilibrium response for the low-resolution model (T31) is 2.32°C. It is shown that the shortwave cloud response of the high-resolution version of the CCSM3 is anomalous compared to the low- and moderate-resolution versions.

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Metadata

Authors
Kiehl, J. T., Shields, C. A., Hack, J. J., & Collins, W. D.
Venue
Journal of Climate
Published
2006-06-01
Volume
19
Issue
11
Pages
2584-2596
ISSN
  • 0894-8755 (ISSN-L)
  • 1520-0442
OpenAlex
W2091319132
Cited by
175
References
1
FWCI
18.25
Type
journal article
Language
en
Open access
closed

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