Comparison of equilibrium and transient responses to CO2 increase in eight state-of-the-art climate models. Yokohata, T., Emori, S., Nozawa, T., Ogura, T., Kawamiya, M., Tsushima, Y., Suzuki, T., Yukimoto, S., Abe-Ouchi, A., Hasumi, H., Sumi, A., & Kimoto, M. Tellus A: Dynamic Meteorology and Oceanography, 60(5):946–961, January, 2008.
Comparison of equilibrium and transient responses to CO2 increase in eight state-of-the-art climate models [link]Paper  doi  abstract   bibtex   
We compared the climate response of doubled CO2 equilibrium experiments (2 × CO2) by atmosphere–slab ocean coupled general circulation models (ASGCMs) and that of 1% per year CO2 increase experiments (1%CO2 by atmosphere–ocean coupled general circulation models (AOGCMs) using eight state-of-the-art climate models. Climate feedback processes in 2 × CO2 are different from those in 1%CO2, and the equilibrium climate sensitivity (T2×) in 2 × CO2 is different from the effective climate sensitivity (T2×,eff) in 1%CO2. The difference between T2× and T2×,eff is from −1.3 to 1.6 K, a large part of which can be explained by the difference in the ice-albedo and cloud feedback. The largest contribution is cloud SW feedback, and the difference in cloud SW feedback for 2 × CO2 and 1%CO2 could be determined by the distribution of the SAT anomaly which causes differences in the atmospheric thermal structure. An important factor which determines the difference in ice-albedo feedback is the initial sea ice distribution at the Southern Ocean, which is generally overestimated in 2 × CO2 as compared to 1%CO2 and observation. Through the comparison of climate feedback processes in 2 × CO2 and 1%CO2, the possible behaviour of the time evolution of T2×,eff is discussed.
@article{yokohata_comparison_2008,
	title = {Comparison of equilibrium and transient responses to {CO}2 increase in eight state-of-the-art climate models},
	volume = {60},
	issn = {1600-0870},
	url = {https://www.tandfonline.com/doi/full/10.1111/j.1600-0870.2008.00345.x},
	doi = {10.1111/j.1600-0870.2008.00345.x},
	abstract = {We compared the climate response of doubled CO2 equilibrium experiments (2 × CO2) by atmosphere–slab ocean coupled general circulation models (ASGCMs) and that of 1\% per year CO2 increase experiments (1\%CO2 by atmosphere–ocean coupled general circulation models (AOGCMs) using eight state-of-the-art climate models. Climate feedback processes in 2 × CO2 are different from those in 1\%CO2, and the equilibrium climate sensitivity (T2×) in 2 × CO2 is different from the effective climate sensitivity (T2×,eff) in 1\%CO2. The difference between T2× and T2×,eff is from −1.3 to 1.6 K, a large part of which can be explained by the difference in the ice-albedo and cloud feedback. The largest contribution is cloud SW feedback, and the difference in cloud SW feedback for 2 × CO2 and 1\%CO2 could be determined by the distribution of the SAT anomaly which causes differences in the atmospheric thermal structure. An important factor which determines the difference in ice-albedo feedback is the initial sea ice distribution at the Southern Ocean, which is generally overestimated in 2 × CO2 as compared to 1\%CO2 and observation. Through the comparison of climate feedback processes in 2 × CO2 and 1\%CO2, the possible behaviour of the time evolution of T2×,eff is discussed.},
	language = {en},
	number = {5},
	urldate = {2017-06-10},
	journal = {Tellus A: Dynamic Meteorology and Oceanography},
	author = {Yokohata, Tokuta and Emori, Seita and Nozawa, Toru and Ogura, Tomoo and Kawamiya, Michio and Tsushima, Yoko and Suzuki, Tatsuo and Yukimoto, Seiji and Abe-Ouchi, Ayako and Hasumi, Hiroyasu and Sumi, Akimasa and Kimoto, Masahide},
	month = jan,
	year = {2008},
	keywords = {GA, Untagged},
	pages = {946--961}
}

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