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Influence of Venus topography on the zonal wind and albedo at cloud top level : The role of stationary gravity waves

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Abstract

Based on the analysis of UV images (at 365 nm) of Venus cloud top (altitude 67±2 km) collected with VMC (Venus Monitoring Camera) on board Venus Express (VEX), it is found that the zonal wind speed south of the equator (from 5°S to 15°s) shows a con- spicuous variation (from -101 to -83 m/s) with geo- graphic longitude of Venus, correlated with the un- derlying relief of Aphrodite Terra. We interpret this pattern [1] as the result of stationary gravity waves produced at ground level by the up lift of air when the horizontal wind encounters a mountain slope. These waves can propagate up to cloud top level, break there and transfer their momentum to the zonal flow.
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Dates and versions

insu-01298368 , version 1 (05-04-2016)

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  • HAL Id : insu-01298368 , version 1

Cite

Jean-Loup Bertaux, Emmanuel Marcq, Igor V. Khatunstsev, Wojciech J. Markiewicz, Alain Hauchecorne, et al.. Influence of Venus topography on the zonal wind and albedo at cloud top level : The role of stationary gravity waves. International Venus Conference 2016, Apr 2016, Oxford, United Kingdom. ⟨insu-01298368⟩
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