[A-CG47] Dynamics of Oceanic and Atmospheric Waves, Vortices, and Circulations

[ACG47-P01] Numerical study of spontaneous gravity wave radiation in the Venus atmosphere (II)

*Norihiko Sugimoto^1,2, Yukiko Fujisawa², Nobumasa Komori², Hiroki Kashimura³, Masahiro Takagi⁴, Yoshi-Yuki Hayashi³ (1.Keio University, Department of Physics, 2.Keio University, Research and Education Center for Natural Sciences, 3.Kobe University, Graduate School of Science, 4.Kyoto Sangyo University, Faculty of Science)

Keywords:Venus atmosphere, Super rotation, General circulation model, Spontaneous gravity wave radiation

Fast zonal winds called super-rotation in the Venus atmosphere are one of the most difficult problems in the planetary sciences, because solid parts of Venus rotate very slowly. So far, we have carried out high-resolution numerical experiments using AFES-Venus, a Venus version of the Earth's atmospheric general circulation model AFES, which was optimized for the Earth Simulator, and have succeeded in reproducing and maintaining a realistic super-rotation. We have also developped a data assimilation system for the Venus atmosphere. In this presentation, we will report further results of an investigation into the excitation mechanism of small-scale gravity waves obtained using the AFES-Venus numerical experiment with the world's highest resolution.