DOI: 10.1002/2017JE005385
Scopus记录号: 2-s2.0-85045516074
论文题名: Effects of Polar Indirect Circulation on Superrotation and Multiple Equilibrium in Long-Term AGCM Experiments With an Idealized Venus-Like Forcing: Sensitivity to Horizontal Resolution and Initial Condition
作者: Yamamoto M. ; Takahashi M.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期: 3 起始页码: 708
结束页码: 728
语种: 英语
英文关键词: general circulation
; multiple equilibrium state
; superrotation
; Venus
Scopus关键词: atmospheric general circulation model
; cloud cover
; experimental study
; Venus
英文摘要: A simplified model setup has been used in atmospheric general circulation models (AGCMs), to clarify the fluid dynamical process of terrestrial planets. In the present work, the research aim is to ascertain the dynamical effects of polar indirect circulation on superrotation and multiple equilibrium states in Venus-like planets. The model setup previously used for Venus AGCM intercomparison is applied to the Model for Interdisciplinary Research On Climate AGCM, and the horizontal resolution and initial conditions are altered in the long-term experiments. The structures of general circulation and planetary-scale waves in the T42 (Truncation wave number 42) experiment are similar to those in the T63 experiment. In the presence of the polar indirect circulation, the superrotational flow weakens in the cloud layer and its momentum is transported toward the lower atmosphere at high latitudes. In contrast, in the T21 experiment, because the polar indirect circulation is not fully resolved, the vertical momentum transport due to the indirect circulation is ineffective in the lower atmosphere, and thus, the cloud top superrotational flow becomes greater than those in the higher-resolution experiments. The multiple equilibrium states caused by different initial zonal flows appear in the T21 experiments, although they are not seen in the experiments of T42 and higher. Thus, the polar indirect circulation in the Gierasch-Rossow-Williams mechanism weakens the superrotational flow in the cloud layer and breaks the steady state multiplicity of the general circulation. ©2018. The Authors.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114361
Appears in Collections: 气候减缓与适应
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作者单位: Research Institute for Applied Mechanics, Kyushu University, Kasuga, Japan; National Institute for Environmental Studies, Tsukuba, Japan
Recommended Citation:
Yamamoto M.,Takahashi M.. Effects of Polar Indirect Circulation on Superrotation and Multiple Equilibrium in Long-Term AGCM Experiments With an Idealized Venus-Like Forcing: Sensitivity to Horizontal Resolution and Initial Condition[J]. Journal of Geophysical Research: Planets,2018-01-01,123(3)