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Properties of methane clouds on Titan: Results from microphysical modeling
Author(s) -
Barth Erika L.,
Toon Owen B.
Publication year - 2004
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2004gl019825
Subject(s) - titan (rocket family) , supersaturation , methane , troposphere , cirrus , atmospheric sciences , barotropic fluid , environmental science , condensation , cloud condensation nuclei , meteorology , astrobiology , physics , geology , climatology , chemistry , thermodynamics , aerosol , organic chemistry
Observations indicate methane in Titan's atmosphere may be both highly supersaturated and condensed in clouds. In this paper, we present simulations of methane clouds which show that supersaturation and condensation can be compatible given certain conditions. Cloud formation is limited by lack of suitable nuclei as it is for terrestrial cirrus. The simulations suggest much of the troposphere contains optically thin clouds composed of methane which have formed on ethane coated cores. Optically thick methane clouds form in regions where atmospheric dynamics pushes the supersaturation beyond a threshold value. Horizontal quasi‐barotropic motions are more likely to drive the supersaturation creating these clouds than are vertical motions.