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research article

Decoupling of mass flux and turbulent wind fluctuations in drifting snow

Paterna, E.  
•
Crivelli, P.
•
Lehning, M.  
2016
Geophysical Research Letters

The wind-driven redistribution of snow has a significant impact on the climate and mass balance of polar and mountainous regions. Locally, it shapes the snow surface, producing dunes and sastrugi. Sediment transport has been mainly represented as a function of the wind strength, and the two processes assumed to be stationary and in equilibrium. The wind flow in the atmospheric boundary layer is unsteady and turbulent, and drifting snow may never reach equilibrium. Our question is therefore: what role do turbulent eddies play in initiating and maintaining drifting snow? To investigate the interaction between drifting snow and turbulence experimentally, we conducted several wind tunnel measurements of drifting snow over naturally deposited snow covers. We observed a coupling between snow transport and turbulent flow only in a weak saltation regime. In stronger regimes it self-organizes developing its own length scales and efficiently decoupling from the wind forcing.

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Type
research article
DOI
10.1002/2016Gl068171
Web of Science ID

WOS:000378339200044

Author(s)
Paterna, E.  
Crivelli, P.
Lehning, M.  
Date Issued

2016

Publisher

Amer Geophysical Union

Published in
Geophysical Research Letters
Volume

43

Issue

9

Start page

4441

End page

4447

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CRYOS  
Available on Infoscience
July 19, 2016
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/127696
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