Threshold for sand mobility on Mars calibrated from seasonal variations of sand flux

F. Ayoub (), J.-P. Avouac, C.E. Newman, M.I. Richardson, A. Lucas, S. Leprince and N.T. Bridges
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F. Ayoub: California Institute of Technology
J.-P. Avouac: California Institute of Technology
C.E. Newman: Ashima Research, 600 South Lake Avenue, Suite 104, Pasadena, California 91106, USA
M.I. Richardson: Ashima Research, 600 South Lake Avenue, Suite 104, Pasadena, California 91106, USA
A. Lucas: California Institute of Technology
S. Leprince: California Institute of Technology
N.T. Bridges: 200-W230, Johns Hopkins University Applied Physics Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Coupling between surface winds and saltation is a fundamental factor governing geological activity and climate on Mars. Saltation of sand is crucial for both erosion of the surface and dust lifting into the atmosphere. Wind tunnel experiments along with measurements from surface meteorology stations and modelling of wind speeds suggest that winds should only rarely move sand on Mars. However, evidence for currently active dune migration has recently accumulated. Crucially, the frequency of sand-moving events and the implied threshold wind stresses for saltation have remained unknown. Here we present detailed measurements of Nili Patera dune field based on High Resolution Imaging Science Experiment images, demonstrating that sand motion occurs daily throughout much of the year and that the resulting sand flux is strongly seasonal. Analysis of the seasonal sand flux variation suggests an effective threshold for sand motion for application to large-scale model wind fields (1–100 km scale) of τs=0.01±0.0015 N m−2.

Date: 2014
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DOI: 10.1038/ncomms6096

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