Phase Shift of Planetary Waves and Wave--Jet Resonance on Tidally Locked Planets

Abstract

Recent studies found that atmospheric superrotation (i.e., west-to-east winds over the equator) on tidally locked planets can modify the phase of planetary waves. But, a clear relationship between the superrotation and the magnitude of the phase shift was not examined. In this study, we re-investigate this problem using a two-dimensional (2D) linear shallow water model with a specified uniform zonal flow. We find that the degree of the phase shift is a monotonic but nonlinear function of the strength of the mean flow, and the phase shift has two limits of -$\pi$ and +$\pi$. The existence of these limits can be explained using the energy balance of the whole system. We further show that a resonance between the Rossby wave and the mean flow occurs when the speed of an eastward jet approaches to the westward phase speed of the Rossby wave, or a resonance between the Kelvin wave and the mean flow happens when the speed of a westward jet approaches to the eastward phase speed of the Kelvin wave. The resonance mechanism is the same as that found in the previous studies on Earth and hot Jupiters. Moreover, in the spin-up period of a 3D global atmospheric general circulation simulation for tidally locked rocky planet, we also find these two phenomena: phase shift and wave--jet resonance. This study improves the understanding of wave--mean flow interactions on tidally locked planets.

References in corpus (28)

• A map of the day-night contrast of the extrasolar planet HD 189733b
• Atmospheric Circulation and Tides of "51Peg b-like" Planets
• Equatorial superrotation on tidally locked exoplanets
• Stabilizing Cloud Feedback Dramatically Expands the Habitable Zone of Tidally Locked Planets
• Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy
• Doppler Signatures of the Atmospheric Circulation on Hot Jupiters
• Atmospheric Circulation of Hot Jupiters: Dayside-Nightside Temperature Differences
• Atmospheric Heat Redistribution on Hot Jupiters
• Atmospheric dynamics of Earth-like tidally locked aquaplanets
• Atmospheric Dynamics of Hot Exoplanets
• The 4.5 $\mu$m full-orbit phase curve of the hot Jupiter HD 209458b
• Atmospheric dynamics of terrestrial exoplanets over a wide range of orbital and atmospheric parameters
• Habitable Climate Scenarios for Proxima Centauri b With a Dynamic Ocean
• Demarcating circulation regimes of synchronously rotating terrestrial planets within the habitable zone
• Atmospheric Dynamics of Hot Giant Planets and Brown Dwarfs
• Phase curves of WASP-33b and HD 149026b and a New Correlation Between Phase Curve Offset and Irradiation Temperature
• 3D Structures of equatorial waves and the resulting superrotation in the atmosphere of a tidally locked hot Jupiter
• Effects of Bulk Composition on The Atmospheric Dynamics on Close-in Exoplanets
• Connecting the dots II: Phase changes in the climate dynamics of tidally locked terrestrial exoplanets
• Wave-Mean Flow Interactions in the Atmospheric Circulation of Tidally Locked Planets
• NIR-Driven Moist Upper Atmospheres of Synchronously Rotating Temperate Terrestrial Exoplanets
• Ocean Dynamics and the Inner Edge of the Habitable Zone for Tidally Locked Terrestrial Planets
• The Climates of Other Worlds: A Review of the Emerging Field of Exoplanet Climatology
• Analytical Models of Exoplanetary Atmospheres. I. Atmospheric Dynamics via the Shallow Water System
• The thermal phase curve offset on tidally- and non-tidally-locked exoplanets: A shallow water model
• Atmospheric bistability and abrupt transitions to superrotation: wave-jet resonance and Hadley cell feedbacks
• The Equatorial Jet Speed on Tidally Locked Planets: I -- Terrestrial Planets
• Sensitivity of the Atmospheric Water Cycle within the Habitable Zone of a Tidally-Locked, Earth-like Exoplanet

Cited by in corpus (7)

• The TRAPPIST-1 Habitable Atmosphere Intercomparison (THAI). Part I: Dry Cases -- The fellowship of the GCMs
• Traveling planetary-scale waves cause cloud variability on tidally locked aquaplanets
• Atmospheric Overturning Circulation on Dry, Tidally-locked Rocky Planets is Mainly Driven by Radiative Cooling
• The GLEAMing of the first supermassive black holes: II. A new sample of high-redshift radio galaxy candidates
• Lorenz Energy Cycle: Another Way to Understand the Atmospheric Circulation on Tidally Locked Terrestrial Planets
• HST WFC3/Grism Observations of the Candidate Ultra-High-Redshift Radio Galaxy GLEAM J0917-0012
• Asymmetry and Variability in the Transmission Spectra of Tidally Locked Habitable Planets