Preprints
https://doi.org/10.5194/tc-2018-113
https://doi.org/10.5194/tc-2018-113
26 Jun 2018
 | 26 Jun 2018
Status: this preprint was under review for the journal TC but the revision was not accepted.

The role of a mid-air collision in drifting snow

Shuming Jia, Zhengshi Wang, and Shumin Li

Abstract. Drifting snow, a common two-phase flow movement in high and cold areas, contributes greatly to the mass and energy balance of glacier and ice sheets and further affects the global climate system. Mid-air collisions occur frequently in high-concentration snow flows; however, this mechanism is rarely considered in current models of drifting snow. In this work, a three-dimensional model of drifting snow with consideration of inter-particle collisions is established; this model enables the investigation of the role of a mid-air collision mechanism in openly drifting snow. It is found that the particle collision frequency increases with the particle concentration and friction velocity, and the blown snow with a mid-air collision effect produces more realistic transport fluxes since inter-particle collision can enhance the particle activity under the same condition. However, the snow saltation mass flux basically shows a cubic dependency with friction velocity, which distinguishes it from the quadratic dependence of blown sand movement. Moreover, the snow saltation flux is found to be largely sensitive to the particle size distribution since the suspension snow may restrain the saltation movement. This research could improve our understanding of the role of the mid-air collision mechanism in natural drifting snow.

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Shuming Jia, Zhengshi Wang, and Shumin Li
 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
Shuming Jia, Zhengshi Wang, and Shumin Li
Shuming Jia, Zhengshi Wang, and Shumin Li

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Short summary
Drifting snow largely changes the mass and energy balance of polar ice sheets. Inter-particle collisions in drifting snow, previously neglected, is studied by tracking trajectories of snow particles. Mid-air collision effect enhances the particle activity, and thus produces a more realistic transport flux. Suspension snows may also restrain the saltation movement due to the reduction of wind speed higher in the air. Interactions between suspension and saltation movements should be considered.