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Observations of Turbulence Beneath Sea Ice in Southern McMurdo Sound, Antarctica : Volume 6, Issue 2 (07/07/2009)

By Stevens, C. L.

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Book Id: WPLBN0004021050
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Observations of Turbulence Beneath Sea Ice in Southern McMurdo Sound, Antarctica : Volume 6, Issue 2 (07/07/2009)  
Author: Stevens, C. L.
Volume: Vol. 6, Issue 2
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Robinson, N. J., Haskell, T. G., M. William, M. J., & Stevens, C. L. (2009). Observations of Turbulence Beneath Sea Ice in Southern McMurdo Sound, Antarctica : Volume 6, Issue 2 (07/07/2009). Retrieved from http://worldlibrary.net/


Description
Description: National Institute for Water and Atmospheric Research (NIWA), Greta Point Wellington, New Zealand. The first turbulence profiler observations beneath land fast sea ice which is directly adjacent to an Antarctic ice shelf are described. The stratification in the 325 m deep water column consisted of a layer of supercooled water in the upper 40 m lying above a quasi-linearly stratified water column with a sharp step in density at mid-depth. Turbulent energy dissipation rates were on average 3×10−8 m2 s−3 with peak bin-averaged values reaching 4×10−7 m2 s−3. The local dissipation rate per unit area was estimated to be 10 mWm−2 on average with a peak of 50 mWm−2. These values are consistent with a moderate baroclinic response to the tides. The small-scale turbulent energetics lie on the boundary between isotropy and buoyancy-affected. This will likely influence the formation and aggregation of frazil ice crystals within the supercooled layer. An estimate of the vertical diffusivity of mass KΡ yields a coefficient of around 10−3 m2 s−1. Combining this estimate of KΡ with available observations of average and maximum currents suggests the layer of supercooled water can persist for a distance of ~20 km from the front of the McMurdo Ice Shelf.

Summary
Observations of turbulence beneath sea ice in southern McMurdo Sound, Antarctica

Excerpt
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