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The Aqua-Planet Experiment (APE): CONTROL SST Simulation

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Title: The Aqua-Planet Experiment (APE): CONTROL SST Simulation
Authors: Blackburn, Michael Browse this author
Williamson, David L. Browse this author
Nakajima, Kensuke Browse this author →KAKEN DB
Ohfuchi, Wataru Browse this author →KAKEN DB
Takahashi, Yoshiyuki O. Browse this author →KAKEN DB
Hayashi, Yoshi-Yuki Browse this author
Nakamura, Hisashi Browse this author →KAKEN DB
Ishiwatari, Masaki Browse this author →KAKEN DB
Mcgregor, John L. Browse this author
Borth, Hartmut Browse this author
Wirth, Volkmar Browse this author
Keywords: comparison of atmospheric general circulation models (GCMs)
idealized model configuration
global energy buget
tropical wave spectrum
Issue Date: Sep-2013
Publisher: Meteorological soc japan
Journal Title: Journal of the meteorological society of japan
Volume: 91A
Start Page: 17
End Page: 56
Publisher DOI: 10.2151/jmsj.2013-A02
Abstract: Climate simulations by 16 atmospheric general circulation models (AGCMs) are compared on an aqua-planet, a water-covered Earth with prescribed sea surface temperature varying only in latitude. The idealised configuration is designed to expose differences in the circulation simulated by different models. Basic features of the aqua-planet climate are characterised by comparison with Earth. The models display a wide range of behaviour. The balanced component of the tropospheric mean flow, and mid-latitude eddy covariances subject to budget constraints, vary relatively little among the models. In contrast, differences in damping in the dynamical core strongly influence transient eddy amplitudes. Historical uncertainty in modelled lower stratospheric temperatures persists in APE. Aspects of the circulation generated more directly by interactions between the resolved fluid dynamics and parameterized moist processes vary greatly. The tropical Hadley circulation forms either a single or double inter-tropical convergence zone (ITCZ) at the equator, with large variations in mean precipitation. The equatorial wave spectrum shows a wide range of precipitation intensity and propagation characteristics. Kelvin mode-like eastward propagation with remarkably constant phase speed dominates in most models. Westward propagation, less dispersive than the equatorial Rossby modes, dominates in a few models or occurs within an eastward propagating envelope in others. The mean structure of the ITCZ is related to precipitation variability, consistent with previous studies. The aqua-planet global energy balance is unknown but the models produce a surprisingly large range of top of atmosphere global net flux, dominated by differences in shortwave reflection by clouds. A number of newly developed models, not optimised for Earth climate, contribute to this. Possible reasons for differences in the optimised models are discussed. The aqua-planet configuration is intended as one component of an experimental hierarchy used to evaluate AGCMs. This comparison does suggest that the range of model behaviour could be better understood and reduced in conjunction with Earth climate simulations. Controlled experimentation is required to explore individual model behaviour and investigate convergence of the aqua-planet climate with increasing resolution.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 石渡 正樹

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