Radiative-dynamical Model of Jupiter’s Quasi-quadrennial Oscillation

Abstract

We present a simulation of Jupiter’s quasi-quadrennial oscillation (QQO) in a 2D radiative-dynamical model. Launching an eastward Kelvin wave and a westward Rossby-gravity wave in the lower boundary, we successfully generate a 4 yr-period oscillation in the equatorial stratosphere. The momentum flux of waves initiates overlying easterly–westerly wind jets descending in altitude with the maximum temperature variation of ±5 K near 10 hPa at the equator. The tropical stratospheric region is dominated by upwelling and downwelling circulation cells induced by the QQO, affecting the midlatitude where stratospheric aerosols enrich. The simulation results are consistent with the previous satellite and ground-based observations in the low latitudes and provide the ability to examine the QQO’s influence in Jupiter’s extratropical stratosphere. The QQO influence further extends into the upper troposphere, forming a weak anticorrelation with the stratosphere oscillation in agreement with the result from 40 yr of telescope observations.

Keywords

• Jupiter
• Atmospheric circulation
• Planetary atmospheres
• Planetary science
• Planetary dynamics
• Solar system gas giant planets