Scattering greenhouse effect of CO2 ice cloud and climate stability on early Mars
Year: 2006
Type: conference-paper
Abstract: The scattering greenhouse effect of CO2 ice cloud has been proposed as a mechanism to make the Martian climate warm enough to support flowing water under a faint young Sun. We construct a one-dimensional radiative model for the CO2-H2O atmosphere and analyze cloud stability on the basis of the numerical estimation of the ice condensation or evaporation rate in a cloud layer. Our numerical analysis suggests that a CO2 ice cloud layer is stabilized and the global mean surface temperature rises above melting point of H2O when the atmospheric pressure is larger than 1 bar and the column number density of cloud condensation nuclei is kept at nearby 10(exp 10) m(exp -2). A negative feedback mechanism between the particle size change and the radiative cooling may stabilize warm climate on early Mars.
Authors: 光田, 千紘, 横畠, 徳太, 倉本, 圭, Mitsuda, Chihiro, Yokohata, Tokuta, Kuramoto, Kiyoshi
Language: English
Subfield: Space and Planetary Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
SDG: Climate action
Open Access status: green
OpenAlex ID: W7015155234