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首页> 外文期刊>Journal of geophysical research. Planets >Sensitivities of General Circulation and Waves to Horizontal Subgrid-Scale Diffusion in Long-Term Time Integrations of a Dynamical Core for Venus
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Sensitivities of General Circulation and Waves to Horizontal Subgrid-Scale Diffusion in Long-Term Time Integrations of a Dynamical Core for Venus

机译:金星动力核心长期时间积分中一般环流和波对水平亚网格尺度扩散的敏感性

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摘要

Super-rotation and waves are sensitive to horizontal subgrid-scale fourth-order diffusion in long-term time integrations of a dynamical core under a Venus-like condition. The rigid-body rotation component of the super-rotation intensifies as the diffusion strengthens, and the fluid dynamic similarity of the nondimensional winds is found among the different diffusions. In the experiments with weak diffusion, the super-rotation is weak in the presence of strong poleward eddy heat flux, enhancing the downward angular momentum transport by the Eliassen-Palm (E-P) flux. In contrast, the strong super-rotation is developed, and both the poleward eddy heat and vertical E-P fluxes are weak in the strong horizontal diffusion experiments. Because the waves with high zonal wave numbers and poleward heat fluxes are strongly dissipated, the vertical E-P fluxes become weak and the contribution of subgrid-scale vertical diffusion becomes large in the momentum budget. As the horizontal diffusion strengthens, the phase velocities of the equatorial waves increase due to the faster background zonal flow (i.e., mean zonal flow). Although strong empirical diffusion produces strong super-rotation, it is still unknown whether it is valid. Thus, we must carefully assess the robustness of the super-rotation in the long-term simulation based on the sensitivity test of horizontal diffusion.
机译:Super-rotation和海浪很敏感水平subgrid-scale四阶扩散在长期时间集成的一个动力核心在金星那样的条件。super-rotation旋转组件加剧的扩散增强,无量纲的流体动力学相似风被发现在不同的扩散。与弱扩散实验super-rotation软弱的强大的存在向极艾迪热通量,提高下行由Eliassen-Palm角动量传输(E-P)通量。super-rotation开发,向极涡和垂直E-P热通量弱中强横向扩散实验。波数和向极热通量强烈消退,垂直E-P通量变得软弱,subgrid-scale的贡献垂直扩散成为大的势头预算。赤道波的相速度增加由于背景纬向流得越快(例如,平均纬向流)。经验扩散产生强烈super-rotation,这仍然是未知是否有效的。长期super-rotation的鲁棒性模拟敏感性测试的基础上横向扩散。

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