We thank Peter Gent for helpful discussions on this manuscript, and Keith Lindsay, Scott Weese, and Lawrence Buja for assistance in the configuration, integration, and analysis of the experiments. This study is based on model integrations that were performed by NCAR and CRIEPI with support and facilities provided by NSF, DOE, MEXT, and ESC/JAMSTEC.
Bitz, C. M., P. R. Gent, R. A. Woodgate, M. M. Holland, and R. Lindsay, 2006: The influence of sea ice on ocean heat uptake in response to increasing CO2. J. Climate, 19 , 2437–2450.
Bleck, R., and S. Sun, 2004: Diagnostics of the thermohaline circulation in a coupled climate model. Global Planet. Change, 40 , 233–248.
Broecker, W. S., 1997: Thermohaline circulation, the Achilles heel of our climate system: Will man-made CO2 upset the current balance? Science, 278 , 1582–1588.
Collins, W. D., and Coauthors, 2006b: The formulation and atmospheric simulation of the Communty Atmosphere Model version 3 (CAM3). J. Climate, 19 , 2144–2161.
Cubasch, U., and Coauthors, 2001: Projections of future climate change. Climate Change 2001: The Scientific Basis, J. T. Houghton et al., Eds. Cambridge University Press, 525–582.
Dickinson, R. E., K. W. Oleson, G. Bonan, F. Hoffman, P. Thornton, M. Vertenstein, Z-L. Zhang, and X. Zeng, 2006: The Community Land Model and its climate statistics as a component of the Community Climate System Model. J. Climate, 19 , 2302–2324.
Dickson, R. R., and J. Brown, 1994: The production of North Atlantic Deep Water: Sources, rates, and pathways. J. Geophys. Res, 99 , C6. 12319–12341.
Dixon, K. W., T. L. Delworth, M. J. Spelman, and R. J. Stouffer, 1999: The influence of transient surface fluxes on the North Atlantic overturning in a coupled GCM climate change experiment. Geophys. Res. Lett, 26 , 2749–2752.
Doney, S. C., W. G. Large, and F. O. Bryan, 1998: Surface ocean fluxes and water-mass transformation rates in the coupled NCAR Climate System Model. J. Climate, 11 , 1420–1441.
Gent, P. R., 2001: Will the North Atlantic Ocean thermohaline circulation weaken during the 21st century? Geophys. Res. Lett, 28 , 1023–1026.
Gent, P. R., and G. Danabasoglu, 2004: Heat uptake and the thermohaline circulation in the Community Climate System Model, version 2. J. Climate, 17 , 4058–4069.
Hack, J. J., J. Caron, G. Danabasoglu, K. Oleson, C. Bitz, and J. E. Truesdale, 2006: CCSM3–CAM3 climate simulation sensitivity to changes in horizontal resolution. J. Climate, 19 , 2267–2289.
Holland, M. M., C. M. Bitz, E. C. Hunke, W. H. Lipscomb, and J. L. Schramm, 2006: Influence of the sea ice thickness distribution on polar climate in CCSM3. J. Climate, 19 , 2398–2414.
Hu, A., G. A. Meehl, and W. Han, 2004: Detecting thermohaline circulation changes from ocean properties in a coupled model. Geophys. Res. Lett, 31 .L13204, doi:10.1029/2004GL020218.
Kiehl, J. T., C. A. Shields, J. J. Hack, and W. Collins, 2006: The climate sensitivity of the Community Climate System Model: CCSM3. J. Climate, 19 , 2584–2596.
Latif, M., E. Roecknet, U. Mikolajewicz, and R. Voss, 2000: Tropical stabilizations of the thermohaline circulation in a greenhouse warming simulation. J. Climate, 13 , 1809–1813.
Manabe, S., and R. J. Stouffer, 1994: Multiple-century response of a coupled ocean–atmosphere model to an increase of atmospheric carbon dioxide. J. Climate, 7 , 5–23.
Mikolajewicz, U., and R. Voss, 2000: The role of individual air-sea flux components in CO2-induced changes of the ocean's circulation and climate. Climate Dyn, 16 , 627–642.
Raper, S. C. B., J. M. Gregory, and R. J. Stouffer, 2002: The role of climate sensitivity and ocean heat uptake on AOGCM transient temperature response. J. Climate, 15 , 124–130.
Saenko, O. A., M. Eby, and A. J. Weaver, 2004: The effect of sea-ice extent in the North Atlantic on the stability of the thermohaline circulation in global warming experiments. Climate Dyn, 22 , 689–699.
Sarmiento, J. L., T. M. Hughes, R. J. Stouffer, and S. Manabe, 1998: Simulated response of the ocean carbon cycle to anthropogenic climate warming. Nature, 393 , 245–249.
Schweckendiek, U., and J. Willebrand, 2005: Mechanisms affecting the overturning response in global warming simulations. J. Climate, 18 , 4925–4936.
Smith, R., and P. Gent, 2004: Reference manual for the Parallel Ocean Program (POP): Ocean component of the Community Climate System Model (CCSM2.0 and 3.0). Tech. Rep. LAUR-02-2484, Los Alamos National Laboratory, Los Alamos, NM, 75 pp. [Available online at http://www.ccsm.ucar.edu/models/ccsm3.0/pop/doc/manual.pdf.].
Steele, M., R. Morely, and W. Ermold, 2001: PHC: A global hydrography with a high-quality Arctic Ocean. J. Climate, 14 , 2079–2087.
Stocker, T. F., and A. Schmittner, 1997: Influence of CO2 emissions rates on the stability of the thermohaline circulation. Nature, 388 , 862–865.
Thorpe, R. B., J. M. Gregory, T. C. Johns, R. A. Wood, and J. F. B. Mitchell, 2001: Mechanisms determining the Atlantic thermohaline circulation response to greenhouse gas forcing in a non-flux-adjusted coupled climate model. J. Climate, 14 , 3102–3116.
Wood, R. A., A. Keen, J. Mitchell, and J. Gregory, 1999: Changing spatial structure of the thermohaline circulation in response to atmospheric CO2 forcing in a climate model. Nature, 399 , 572–575.
Wood, R. A., M. Velinga, and R. Thorpe, 2003: Global warming and thermohaline circulation stability. Philos. Trans. Roy. Soc. London, 361A , 1961–1975.