The 120th AICS Cafe
Date and Time: Wed. Sep. 13, 2017, 15:30-16:30
Place: Workshop room (6th floor) at AICS
Title: High-resolution simulation of the Venusian atmospheric circulation
Speaker: Hiroki Kashimura (Center for Planetary Science (CPS), Kobe University)
Presentation Language: Japanese
Presentation Material: Japanese
Venus is sometimes called Earth's twin, because the planetary radius and the surface gravity of both are almost the same. On the other hand, the rotation period of Venus is very long as 243 Earth days, in other words the solid part is rotating slowly. However, the Venusian atmosphere rotates around the planetary-rotation axis in about 4 Earth days, about 60 times faster than its solid part. This fast zonal wind is called 4-day circulation or superrotation. To explore and reveal the mechanism of the atmospheric superrotation of Venus, numerical simulations with global atmospheric models have been performed.
In this presentation, we review the simulation researches of the Venusian atmospheric circulation and show recent results of our high-resolution simulation. In particular, we focus on the planetary-scale streak structure suggested by the latest observation by the Venus Climate Orbiter/AKATSUKI, and discuss its mechanism.