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Martian mesoscale and microscale wind variability of relevance for dust lifting

Spiga, Aymeric and Lewis, Stephen R. (2010). Martian mesoscale and microscale wind variability of relevance for dust lifting. Mars, 5 pp. 146–158.

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Background: Mars si both a windy and dusty environment. Ariborne dust is a crucial climate component on Mars. It impacts atmospheric circulations at large-, meso- and micro-scales, which in turn control dust lifting from the surface and transport in the atmosphere. Dust lifting processes and feedbacks on atmospheric circulations are currently not well understood.
Method: Our purpose is to show how mesoscale models and large-eddy simulations help to explore small-scale circulation patterns which are potentially important for lifting dust into the atmosphere but which are unresolved by global climate models. We focus on variations of friction velocity, u*, relevant for dust lifting, in particular investigating maximum values and the spatial and temporal variability of u*.
Conclusion: Meteorological scales between 100 km and 10 km can be studied by high-resolution global circulation and limited-area mesoscale models, which both show strong topographic control of the daytime and nighttime near-surface winds. Scales below 10 km and 1 km are dominated by turbulent gusts and dust devils, two distinct convective boundary layer processes likely to lift dust from the surface. In low-latitude regions, boundary layer depth and friction velocity u* are correlated with surface altimetry. Further studies will be carried out to parameterize lifting by boundary layer processes and dust radiative effects once transported in the atmosphere.

Item Type: Journal Item
Copyright Holders: 2010 The Authors
ISSN: 1548-1921
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Space
Item ID: 25467
Depositing User: Stephen Lewis
Date Deposited: 15 Dec 2010 11:29
Last Modified: 10 Dec 2018 10:56
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