Large-Eddy Simulations of Vertical Vortex Formation in the Terrestrial and Martian Convective Boundary Layers |
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Authors: | Babak T Gheynani Peter A Taylor |
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Institution: | (1) Centre for Research in Earth and Space Science, York University, Toronto, ON, Canada |
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Abstract: | Large-eddy simulations (LES) of the Martian and terrestrial convective boundary layers (CBL) are performed to compare the
physical characteristics of simulated convective vertical vortices to those of observed dust devils and vortices. Martian
and terrestrial CBLs are outwardly found to have similar structures and turbulence statistics based on primary mechanisms
for the transfer of energy from the insolated surface. Applying the heating effect of radiative flux divergence in the Martian
atmosphere caused differences in atmospheric vertical profiles in the surface and mixed layers of Mars. In general, the Martian
boundary layer is found to be roughly four times deeper than Earth’s, indicating that convection on Mars is more intense than
that on Earth due to a lower atmospheric density. Performing fine-resolution simulations in quiescent atmospheres of the two
planets, it is found that the general vorticity development in all cases is similar and that the Martian vorticity columns
extend six times higher and are 10 times wider than those on Earth. The accuracy of the simulated vortices as compared with
observed physical characteristics is discussed. This study is a necessary part of a larger effort for the Phoenix Mars mission
and examines the possible formation and maintenance mechanisms for vertical vortices in the Martian convective boundary layer
at the Phoenix lander site. |
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