A general circulation model ensemble study of the atmospheric circulation of Venus

A general circulation model ensemble study of the atmospheric circulation of Venus
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金星大气环流的大气环流模式集合研究

DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Richardson
M. Richardson
中科院分区：
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文献类型：
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作者：
Christopher Lee;M. Richardson

文献摘要

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本文描述了三个数值模型动力核心对类金星力和摩擦的响应。每个动力核心模拟赤道风速为 35 ± 10 m/s 的超级旋转大气环流，通过离开赤道区域的水平传播涡流并在那里引起动量收敛来维持。我们参考超级旋转赤道流的产生来讨论平均环流和涡流之间的平衡。讨论并显示了极地区域水平涡流和垂直涡流之间的平衡，以在射流上方产生间接翻转环流。这种间接翻转可能与金星大气中极偶极子的观测区域有关。计算每个动力核心的能量和动量储备，并根据大气环流模型 (GCM) 诊断明确的源和汇。将强“海绵层”阻尼对静止的影响与涡流阻尼进行比较，发现显着改变顶部“海绵层”内的动量平衡，但不会显着影响大气主体的超级旋转。计算了Lorenz (1955)的能量循环，表明环流以平均势能和平均动能库之间的能量转换为主，平均动能库和涡流动能库之间以正压能量转换为主。我们建议在大气环流分析的基础上对 GCM 参数化进行修改，并讨论数值参数化对模拟大气的影响。
The response of three numerical model dynamical cores to Venus-like forcing and friction is described in this paper. Each dynamical core simulates a super-rotating atmospheric circulation with equatorial winds of 35 ± 10 m/s, maintained by horizontally propagating eddies leaving the equatorial region and inducing a momentum convergence there. We discuss the balance between the mean circulation and eddies with reference to the production of a super-rotating equatorial flow. The balance between the horizontal eddies and vertical eddies in the polar region is discussed and shown to produce an indirect overturning circulation above the jet. The indirect overturning may be related to the observed region of the polar dipole in the Venus atmosphere. Reservoirs of energy and momentum are calculated for each dynamical core and explicit sources and sinks are diagnosed from the general circulation model (GCM). The effect of a strong “sponge layer” damping to rest is compared with eddy damping and found to change significantly the momentum balance within the top “sponge layer” but does not significantly affect the super-rotation of the bulk of the atmosphere. The Lorenz (1955) energy cycle is calculated and the circulation is shown to be dominated by energy conversion between the mean potential energy and mean kinetic energy reservoirs, with barotropic energy conversion between the mean kinetic energy and eddy kinetic energy reservoirs. We suggest modifications to the GCM parameterizations on the basis of our analysis of the atmospheric circulation and discuss the effect of numerical parameterizations on the simulated atmosphere.