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Attenuation of wind-induced pressure perturbations in alpine snow


Authors: STEPHEN A. DRAKE
Owners: CTEMPs OSU-UNR
Resource type:Composite Resource
Created:Dec 29, 2017 at 11:37 p.m.
Last updated: Apr 09, 2018 at 8:46 p.m. by CTEMPs OSU-UNR

Abstract

Windpumping has been identified as a process that could potentially enhance sublimation of surface snow at high forcing frequency and spawn air movement deeper in firn at lower frequencies. We performed an experiment to examine the relationship between high-frequency wind and pressure measurements within the top meter of an alpine snowpack and compared experimental results with two theoretical predictions. We find that both theoretical predictions underestimate high-frequency perturbation pressure attenuation with depth in the near-surface snowpack and the discrepancy between theory and measurement increases with perturbation pressure frequency. The impact of this result for near-surface snow is that potential enhanced sublimation will occur over a shallower snow depth than these two theories predict. Correspondingly, interstitial air mixing at depth in firn will be driven by lower frequencies than these two theories predict. While direct measurement of these energy-rich lower frequencies is beyond the scope of this paper, stationary pressure measurements validate the presence of a pressure field that could drive near-surface circulation.

Raw project data is available by contacting ctemps@unr.edu

Subject Keywords

windpumping,distributed temperature sensing,ice chronology,glacier meterology,DTS,snow ice surface processes,CTEMPs

How to cite

DRAKE, S. A. (2018). Attenuation of wind-induced pressure perturbations in alpine snow, HydroShare, http://www.hydroshare.org/resource/9725a0bee83f460d92555602ce0cc5a4

This resource is shared under the Creative Commons Attribution CC BY.

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Name Organization Address Phone Author Identifiers
STEPHEN A. DRAKE

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