Implications of a Radiative Zone on Jupiter’s Gravity Field and Atmospheric Dynamics

Recent measurements from the Juno spacecraft have revived interest in the possible existence of a radiative zone within Jupiter's atmosphere. If such a layer exists, it would create a stably stratified region, estimated to extend up to 2000 km, challenging the traditional view of a predominantly convective envelope associated with the planet’s zonal jet streams, which penetrate approximately 3000 km. In this study, we explore the potential effects of this radiative zone on Jupiter’s jet stream properties and gravity field. Combining gravity measurement constraints with numerical simulations of a shallow atmospheric model representative of Jupiter, we investigate the dynamical implications of a radiative layer. Our analysis evaluates how the presence of this zone could alter atmospheric dynamics, offering new insights into the planet’s internal structure and questioning the hypothesis of a fully convective dynamical layer. Additionally, through gravity data analysis, we assess whether the existence of such a radiative zone is feasible within Jovian conditions. These findings highlight the importance of considering layered atmospheric models in planetary data interpretation. Moreover, the presence of a radiative zone could be a common feature in other planetary systems and exoplanets, underscoring the need for further research into planetary atmospheres and interiors and their broader implications for planetary science.