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Venusian Applications of 3D Convection Modeling

Show simple item record Bonaccorso, Timary “Annie” 2012-09-17T22:29:25Z 2012-09-17T22:29:25Z 2011-08-15
dc.identifier.citation NASA Undergraduate Student Research Program (USRP), Pasadena, California, August 2011 en_US
dc.identifier.clearanceno 11-3612
dc.description.abstract This study models mantle convection on Venus using the 'cubed sphere' code OEDIPUS, which models one-sixth of the planet in spherical geometry. We are attempting to balance internal heating, bottom mantle viscosity, and temperature difference across Venus' mantle, in order to create a realistic model that matches with current planetary observations. We also have begun to run both lower and upper mantle simulations to determine whether layered (as opposed to whole-mantle) convection might produce more efficient heat transfer, as well as to model coronae formation in the upper mantle. Upper mantle simulations are completed using OEDIPUS' Cartesian counterpart, JOCASTA. This summer's central question has been how to define a mantle plume. Traditionally, we have defined a hot plume the region with temperature at or above 40% of the difference between the maximum and horizontally averaged temperature, and a cold plume as the region with 40% of the difference between the minimum and average temperature. For less viscous cases (1020 Pa∙s), the plumes generated by that definition lacked vigor, displaying buoyancies 1/100th of those found in previous, higher viscosity simulations (1021 Pa∙s). As the mantle plumes with large buoyancy flux are most likely to produce topographic uplift and volcanism, the low viscosity cases' plumes may not produce observable deformation. In an effort to eliminate the smallest plumes, we experimented with different lower bound parameters and temperature percentages. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2011. en_US
dc.subject Venus en_US
dc.subject convection en_US
dc.subject mantle plumes en_US
dc.title Venusian Applications of 3D Convection Modeling en_US
dc.type Student Report en_US
dc.subject.NASATaxonomy Lunar and Planetary Science and Exploration en_US

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