Generic frequency dependence for the atmospheric tidal torque of terrestrial planets

Auclair-Desrotour, Pierre; Leconte, Jérémy; Mergny, Cyril

doi:10.1051/0004-6361/201834685

Cited by 14 publications

(6 citation statements)

References 63 publications

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“…For each configuration, we run simulations with various values of tidal potential (0, U max , and U 10 max ´). With a zero potential value, we turn off the gravitational tides, so that by comparing simulations, we can separate the effects of gravitational tides from other waves, such as thermal tides that dominate the surface pressure field of planets in synchronous rotation (Leconte et al 2015;Auclair-Desrotour et al 2019).…”

Section: Setupmentioning

confidence: 99%

Atmospheric Gravitational Tides of Earth-like Planets Orbiting Low-mass Stars

et al. 2022

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Temperate terrestrial planets orbiting low-mass stars are subject to strong tidal forces. The effects of gravitational tides on the solid planet and that of atmospheric thermal tides have been studied, but the direct impact of gravitational tides on the atmosphere itself has so far been ignored. We first develop a simplified analytic theory of tides acting on the atmosphere of a planet. We then implement gravitational tides into a general circulation model of a static-ocean planet in a short-period orbit around a low-mass star—the results agree with our analytic theory. Because atmospheric tides and solid-body tides share a scaling with the semimajor axis, we show that there is a maximum amplitude of the atmospheric tide that a terrestrial planet can experience while still having a solid surface; Proxima Centauri b is the poster child for a planet that could be geophysically Earth-like but with atmospheric tides more than 500× stronger than Earth’s. In this most extreme scenario, we show that atmospheric tides significantly impact the planet’s meteorology—but not its climate. Two possible modest climate impacts are enhanced longitudinal heat transport and cooling of the lowest atmospheric layers. The strong radiative forcing of such planets dominates over gravitational tides, unlike moons of cold giant planets, such as Titan. We speculate that atmospheric tides could be climatologically important on planets where the altitude of maximal tidal forcing coincides with the altitude of cloud formation and that the effect could be detectable for non-Earth-like planets subject to even greater tides.

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Section: Setupmentioning

confidence: 99%

Atmospheric Gravitational Tides of Earth-like Planets Orbiting Low-mass Stars

et al. 2022

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“…Due to timescale of the convection and clouds dynamics, the LMD generic CRM uses an online radiative transfer and is therefore a category 3 LES (according to the terminology described in Section 2.4 of Spiga et al 2016). The LMD generic physics model is a versatile package that has been used on various studies with the LMDz 3D dynamical core from low irradiated planets terrestrial planets such as Archean Earth (Charnay et al 2013), Early Mars (Forget et al 2013;Wordsworth et al 2013;Turbet et al 2017aTurbet et al , 2020Turbet & Forget 2019), Snowball Earth-like planets or exoplanets (Turbet et al 2017b), as well as for terrestrial exoplanets receiving a similar flux than Earth (Wordsworth et al 2011;Bolmont et al 2016;Turbet et al 2016Turbet et al , 2018Auclair-Desrotour et al 2019), and for terrestrial exoplanets receiving relatively high irradiation such as future Earth (Leconte et al 2013b) or tidally locked exoplanets (Leconte et al 2013a). The LMD generic physics model has also been used to simulate the atmosphere of solar system giant planets (Spiga et al 2020) and warm-Neptune-like exoplanets (Charnay et al 2015a(Charnay et al , 2015b.…”

Section: Coupling With Complete Laboratoire De Météorologiementioning

confidence: 99%

3D Convection-resolving Model of Temperate, Tidally Locked Exoplanets

Lefèvre

Turbet

Pierrehumbert

2021

ApJ

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A large fraction of known terrestrial-size exoplanets located in the habitable zone of M-dwarfs are expected to be tidally locked. Numerous efforts have been conducted to study the climate of such planets, using in particular 3D global climate models (GCMs). One of the biggest challenges in simulating such an extreme environment is to properly represent the effects of sub-grid convection. Most GCMs use either a simplistic convective-adjustment parameterization or sophisticated (e.g., mass flux scheme) Earth-tuned parameterizations. One way to improve the representation of convection is to study convection using numerical convection-resolving models (CRMs), with a fine spatial resolution. In this study, we developed a CRM coupling the non-hydrostatic dynamical core Advanced Research Weather-Weather Research and Forecast model with the radiative transfer and cloud/precipitation models of the Laboratoire de Météorologie Dynamique generic climate model to study convection and clouds on tidally locked planets, with a focus on Proxima b. Simulations were performed for a set of three surface temperatures (corresponding to three different incident fluxes) and two rotation rates, assuming an Earth-like atmosphere. The main result of our study is that while we recover the prediction of GCMs that (low-altitude) cloud albedo increases with increasing stellar flux, the cloud feedback is much weaker due to transient aggregation of convection leading to low partial cloud cover.

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“…Due to timescale of the convection and clouds dynamics, the LMD Generic CRM uses an online raditive transfer and is therefore a category 3 LES (according to the terminology described in section 2.4 of Spiga et al, 2016). The LMD Generic physics is a versatile package that was used on various studies with the LMDz 3-D dynamical core from low irradiated planets terrestrial planets such as Archean Earth (Charnay et al, 2013) , Early Mars (Forget et al, 2013;Wordsworth et al, 2013;Turbet et al, 2017a;Turbet and Forget, 2019;Turbet et al, 2020), Snowball Earth-like planets or exoplanets (Turbet et al, 2017b) ; as well as for terrestrial exoplanets receiving a similar flux than Earth (Wordsworth et al, 2011;Bolmont et al, 2016;Turbet et al, 2016Turbet et al, , 2018Auclair-Desrotour et al, 2019) ; and for terrestrial exoplanets receiving relatively high irradiation such as future Earth (Leconte et al, 2013a) or tidally locked exoplanets (Leconte et al, 2013b). The LMD Generic physics was also used to simulate the atmosphere of solar system giant planets (Spiga et al, 2020) and warm-Neptune-like exoplanets (Charnay et al, 2015a,b).…”

Section: Coupling With Complete Lmd Generic Gcm Physical Packagesmentioning

confidence: 99%

3D convection-resolving model of temperate, tidally-locked exoplanets

Lefèvre,

Turbet,

Pierrehumbert

2021

Preprint

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A large fraction of known terrestrial-size exoplanets located in the Habitable Zone of M-dwarfs are expected to be tidally-locked. Numerous efforts have been conducted to study the climate of such planets, using in particular 3-D Global Climate Models (GCM). One of the biggest challenges in simulating such an extreme environment is to properly represent the effects of sub-grid convection. Most GCMs use either a simplistic convective-adjustment parametrization or sophisticated (e.g., mass flux scheme) Earth-tuned parametrizations. One way to improve the representation of convection is to study convection using Convection Resolving numerical Models (CRMs), with an fine spatial resolution . In this study, we developed a CRM coupling the non-hydrostatic dynamical core WRF with the radiative transfer and cloud/precipitation models of the LMD-Generic climate model to study convection and clouds on tidally-locked planets, with a focus on Proxima b. Simulations were performed for a set of 3 surface temperatures (corresponding to three different incident fluxes) and 2 rotation rates, assuming an Earth-like atmosphere. The main result of our study is that while we recover the prediction of GCMs that (low-altitude) cloud albedo increases with increasing stellar flux, the cloud feedback is much weaker due to transient aggregation of convection leading to low partial cloud cover.

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Generic frequency dependence for the atmospheric tidal torque of terrestrial planets

Cited by 14 publications

References 63 publications

Atmospheric Gravitational Tides of Earth-like Planets Orbiting Low-mass Stars

Atmospheric Gravitational Tides of Earth-like Planets Orbiting Low-mass Stars

3D Convection-resolving Model of Temperate, Tidally Locked Exoplanets

3D convection-resolving model of temperate, tidally-locked exoplanets

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