General Circulation Models Archives

Frame of reference and system of coordinates. Blue arrows denote the Cartesian unit vectors (ex, ey, ez) associated with the frame of reference of the planet, R, and red arrows the unit vector basis (er, eθ, eφ) associated with the standard spherical coordinates pr, θ, φq, with r, θ, and φ being the radial coordinate, the colatitude, and the longitude, respectively. Also are shown the planet’s centre of mass, O, which serves as the origin of R, the planet radius, R, and the pressure height of the atmosphere, H!R. -- astro-ph.EP

An Analytical Framework For Atmospheric Tides On Rocky Planets. I. Formulation

by Keith CowingDecember 14, 2025December 14, 2025

Atmospheric thermal tides arise from the diurnal contrast in stellar irradiation. They exert a significant influence on the long-term rotational evolution of rocky planets because they can accelerate the planetary […]

Maximum reached by the imaginary part of the semidiurnal surface pressure component given by Eq. (2.4) as a function of the atmospheric opacity and radiative cooling frequency. The black solid and dashed lines define, from below, regions where the thermotidal response is sufficient to cancel the gravitational counterpart in the Precambrian (4587−538 Myr) and the late Paleozoic/early Mesozoic (350−250 Myr). The shaded areas indicate the contraints on αA and σ0 derived from observations and GCM simulations, along with the corresponding radiative timescales. The yellow and red arrows indicate the amplification factors needed to reach the Precambrian and Mesozoic/Paleozoic thresholds, respectively. The pink and green dots represent the GCM simulations of Wu et al. (2023), Fig. S4 (W23), and of Deitrick & Goldblatt (2024), Fig. 1 (DG24), respectively. Figure adapted from F24, Fig. 5. -- astro-ph.EP

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Exoplanets, -moons, -comets, Habitable Zones, Status Report

Thermal Tides On Rocky Planets Through A Novel Fully Analytical Solution

by Keith CowingOctober 22, 2024October 22, 2024

Thermal tides are atmospheric tides caused by variations in day-night insolation, similar to gravitational tides but with key differences.

General Circulation Models

An Analytical Framework For Atmospheric Tides On Rocky Planets. I. Formulation

Thermal Tides On Rocky Planets Through A Novel Fully Analytical Solution

Roman Space Telescope: Enabling Images Of Distant Worlds

NASA Solar System Exploration Research Virtual Institute (SSERVI) Cooperative Agreement Notice (NNH26ZDA016C) Final Text And Due Dates

Interstellar Aromatic Infrared Bands: IR Absorption Spectroscopy Of The Lowest Triplet State Of Naphthalene

The Highly Unusual Behavior And Chemical Composition Of Interstellar Comet 2I/Borisov

Volatile Depletion In Rocky Planets As A Chemical Fingerprint Of Hybrid Accretion