Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.u23c0074m&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #U23C-0074
Other
3346 Planetary Meteorology (5445, 5739), 5220 Hydrothermal Systems And Weathering On Other Planets, 5455 Origin And Evolution, 5480 Volcanism (6063, 8148, 8450), 6295 Venus
Scientific paper
Venus is, in bulk, nearly Earth's twin, yet the tectonic styles of the two planets are radically different. Suggested explanations for this extreme difference have invoked the lack of liquid water on Venus, the greater degree of crustal differentiation on Venus, and recently, the effect of the elevated surface temperature on convective stresses. These explanations generally involve an interaction between the state of the atmosphere/hydrosphere and the state of the mantle. Atmospheric evolution models have long considered the interaction between different reservoirs, including the mantle, but have never considered the feedback between rates of mantle processes and volatile recycling rates. Coupled atmospheric- hydrosphere-mantle dynamics models will be presented that explore the relationships between water recycling, mantle viscosities, lithospheric stresses, melt production rates and plate yielding. The models include two-dimensional solutions of mantle flow that include water-dependent viscosity and solidus behavior, volatile recycling and outgassing, and a parameterized greenhouse atmosphere with both carbon dioxide and water reservoirs. The complex system of feedbacks yields multiple equilibira and quasi-stable oscillatory states.
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