Japan Geoscience Union Meeting 2019

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[J] Poster

A (Atmospheric and Hydrospheric Sciences ) » A-OS Ocean Sciences & Ocean Environment

[A-OS19] Dynamics of oceanic and atmospheric waves, vortices, and circulations

Mon. May 27, 2019 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall8, Makuhari Messe)

convener:Yuki Tanaka(Graduate School of Science, The University of Tokyo), Ryo Furue(APL/JAMSTEC), Yukiharu Hisaki(University of the Ryukyus), Norihiko Sugimoto(Keio University, Department of Physics)

[AOS19-P01] Atmospheric super rotation developed in a GCM (AFES-Venus)

*Norihiko Sugimoto1, Masahiro Takagi2, Yoshihisa Matsuda3 (1.Keio University, Department of Physics, 2.Kyoto Sangyo University, Department of Physics, 3.Tokyo Gakugei University, Department of Natural Sciences)

Keywords:General circulation, Super rotation, Venus

The generation mechanism of the atmospheric super rotation on Venus is one of the most important topics in the Earth and planetary sciences. Here we reproduced the fully developed super-rotation for the first time in a Venus general circulation model (GCM) driven by a zonally-averaged component of the realistic solar heating only. Our GCM enables us to perform long term simulations with medium resolution higher than those used in previous studies. It is newly found that mean meridional circulation driven by the realistic solar heating can generate the fully developed super-rotation of ~100 m s-1 with the vertical eddy viscosity smaller than 0.02 m2 s-1 (see below Figure). Existence of the range of the vertical eddy viscosity in which the fast super-rotation can be generated by the reasonable solar heating has broad implications for the atmospheric sciences in light of optimal parameters for the GCMs.

Fully developed super-rotation driven by the mean meridional circulation in a Venus GCM, Norihiko Sugimoto, Masahiro Takagi, and Yoshihisa Matsuda, Geophysical Research Letters, (2019), doi.org/10.1029/2018GL080917.