Fully Developed Superrotation Driven by the Mean Meridional Circulation in a Venus GCM
Fully Developed Superrotation Driven by the Mean Meridional Circulation in a Venus GCM
复制标题
金星 GCM 中平均经向环流驱动的充分发展的超自转
DOI：
10.1029/2018gl080917
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Yoshihisa Matsuda
中科院分区：
文献类型：
--
作者：
Norihiko Sugimoto;Masahiro Takagi;Yoshihisa Matsuda
完全发达的超旋转是第一次在非常长期的模拟与动态金星大气环流模式（GCM）驱动的纬向平均分量的realisticsolar加热。从一个静止的状态开始，温度分布，包括一个低的静态稳定度层在低云层，快速超旋转的纬向流~100米/秒的建立后，500地球年。在这个实验中，平均纬向环流是负责产生的超旋转，因为热潮汐，地形，辐射过程和云物理的影响被排除在本模拟。敏感性实验表明，垂直涡动粘滞系数小于0.02m2/s是快速超旋出现的必要条件。低静稳定度层也通过云层中斜压/正压不稳定性的角动量输送强烈影响高纬度急流的超旋转。
Fully developed superrotation is reproduced for the first time in very long term simulations with a dynamical Venus general circulation model (GCM) driven by a zonally averaged component of therealisticsolar heating only. Starting from a motionless state with temperature distribution including a low static stability layer in the lower cloud layer, the fast superrotating zonal flow of ~100 m/s is established after 500 Earth years. In this experiment, the mean meridional circulation is responsible for generating the superrotation, because effects of thermal tides, topography, radiation process, and cloud physics are excluded in the present simulations. Sensitivity experiments indicate that the vertical eddy viscosity smaller than 0.02 m2/s is necessary for the fast superrotation to appear. The low static stability layer also strongly affects the superrotation with high‐latitude jets through angular momentum transport by baroclinic/barotropic instability in the cloud layer.