ice caps Archives

Mass of surface water in the collapsed state as a function of the stellar flux S∗ and the background surface pressure pdry (A), and a function of S∗ and the CO2 concentration fCO2 (B). In panel(A), fCO2 = 376 ppmv; in panel(B), pdry = 1 bar. Gray dashed curves in both panels mark the boundaries of runaway greenhouse state where no surface water can exist, and red stars correspond to the example shown in Figure 2. -- astro-ph.EP

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Exoplanets, -moons, -comets, Habitable Zones, Status Report, Venus, Water/Hycean Worlds & Oceanography

Retention Of Surface Water On Tidally Locked Rocky Planets In The Venus Zone Around M Dwarfs

by Keith CowingMay 20, 2025May 20, 2025

Terrestrial planets within the Venus zone surrounding M dwarf stars can retain surface ice caps on the perpetual dark side if atmospheric heat transport is inefficient, (as suggested by previous […]

CO2 reservoir sizes of the atmosphere (Patm) (a–c), and the fractional habitability (fhab) (d–f) calculated with respect to different obliquity and total exchangeable reservoir size (Ptot) under present solar luminosity (a, d), different solar luminosity and Ptot under an obliquity of 10˚ (b, e), and different obliquity and Ptot under solar luminosity of 0.75 times relative to the present value (c,f). The region “NP only” represents the solution with the permanent ice only at the north pole. The Patm values shown in a, b, and c are the maximum value that is possible in each condition. -- astro-ph.EP

Atmospheres, Climate, Weather, Biogeochemical Cycles & Geobiology, Biosignatures & Paleobiology, Gaia - Planetary Perspectives, Habitable Zones, Mars, Status Report

Behaviors of Martian CO2-driven Dry Climate System and Conditions for Atmospheric Collapses

by Keith CowingNovember 14, 2024November 14, 2024

The present Martian climate is characterized by a cold and dry environment with a thin atmosphere of carbon dioxides (CO2).

ice caps

Retention Of Surface Water On Tidally Locked Rocky Planets In The Venus Zone Around M Dwarfs

Behaviors of Martian CO2-driven Dry Climate System and Conditions for Atmospheric Collapses

Thermal Evolution of Lava Planets Across System Ages: Predictions for Hell of a Survey

Thioacetaldehyde (CH3CHS) On Interstellar Ices: A Key Molecule To Unravel Two Chemical Dichotomies In The ISM

Interstellar Disparity: N- vs O-bearing Molecules: A Multidisciplinary Perspective across Interstellar Environments

Water Cloud and Chemical Modulations in the Coldest Brown Dwarf

A Binary Flux Calibrator Reveals the Scientific Potential of Short-integration JWST MIRI Imaging to Directly Detect sub-Jupiter Exoplanets