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Titan, Mars and Earth : Entropy production by latitudinal heat transport
Author(s) -
Lorenz Ralph D.,
Lunine Jonathan I.,
Withers Paul G.,
McKay Christopher P.
Publication year - 2001
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 - 10.1029/2000gl012336
Subject(s) - titan (rocket family) , mars exploration program , astrobiology , entropy production , atmospheric sciences , planet , environmental science , geology , latitude , geophysics , physics , astronomy , geodesy , thermodynamics
Temperature contrasts between warm tropics and cool high latitudes depends on how efficiently heat is transported by the atmosphere (and oceans) from the tropics. This heat transport is generally assumed to be proportional to atmospheric pressure, but we show with a simple model that this prediction fails by orders of magnitude for Mars and Titan. However, a basic principle, previously postulated for the Earth, does successfully predict the heat flows and zonal temperatures of Mars and Titan. The circulation predicted by this Maximum Entropy Production (MEP) principle is consistent with Titan's observed zonal structure and the winds and CO 2 frost cycle on Mars. The principle makes powerful predictions where detailed information is lacking, such as on the early Earth and on possibly habitable extrasolar planets.