The Key Factors Controlling the Seasonality of Planetary Climate

Abstract

Several different factors influence the seasonal cycle of a planet. This study uses a general circulation model and an energy balance model (EBM) to assess the parameters that govern the seasonal cycle. We define two metrics to describe the seasonal cycle, ${\varphi }_s$, the latitudinal shift of the maximum temperature, and $\Delta T$, the maximum seasonal temperature variation amplitude. We show that alongside the expected dependence on the obliquity and orbital period, where seasonality generally strengthens with an increase in these parameters, the seasonality depends in a nontrivial way on the rotation rate. While the seasonal amplitude decreases as the rotation rate slows down, the latitudinal shift, ${\varphi }_s$, shifts poleward. A similar result occurs in a diffusive EBM with increasing diffusivity. These results suggest that the influence of the rotation rate on the seasonal cycle stems from the effect of the rotation rate on the atmospheric heat transport.

References in corpus (9)

• Atmospheric dynamics of Earth-like tidally locked aquaplanets
• Atmospheric dynamics of terrestrial exoplanets over a wide range of orbital and atmospheric parameters
• Effects of Extreme Obliquity Variations on the Habitability of Exoplanets
• Atmospheres on Nonsynchronized Eccentric-tilted Exoplanets I: Dynamical Regimes
• Uranus in Northern Mid-Spring: Persistent Atmospheric Temperatures and Circulations Inferred from Thermal Imaging
• An axisymmetric limit for the width of the Hadley cell on planets with large obliquity and long seasonality
• Tropical and Extratropical General Circulation with a Meridional Reversed Temperature Gradient as Expected in a High Obliquity Planet
• The emergence of a summer hemisphere jet in planetary atmospheres
• Weak Seasonality on Temperate Exoplanets Around Low-mass Stars

Cited by in corpus (2)

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