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Flow and Mixing Around a Glacier Tongue : Volume 7, Issue 4 (11/08/2010)

By Stevens, C. L.

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Book Id: WPLBN0003976733
Format Type: PDF Article :
File Size: Pages 29
Reproduction Date: 2015

Title: Flow and Mixing Around a Glacier Tongue : Volume 7, Issue 4 (11/08/2010)  
Author: Stevens, C. L.
Volume: Vol. 7, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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M. William, M. J., Stewart, C. L., Robinson, N. J., Stevens, C. L., & Haskell, T. G. (2010). Flow and Mixing Around a Glacier Tongue : Volume 7, Issue 4 (11/08/2010). Retrieved from

Description: National Institute for Water and Atmospheric Research (NIWA), Greta Point Wellington, New Zealand. A glacier tongue floating in the coastal ocean presents a significant obstacle to the local flow and influences oceanic mixing and transport processes. Here ocean shear microstructure observations at a glacier tongue side-wall show tidally-induced flow pulses and vortices as well as concomitant mixing. Flow speeds within the pulses reached around three times that of the ambient tidal flow amplitude and generated vertical velocity shear as large as 3×10−3 s−1. During the maximum flow period turbulent energy dissipation rates reached a maximum of 10−5 m2 s−3, around three decades greater than local background levels. This is in keeping with estimates of the gradient Richardson Number which dropped to around unity. Associated vertical diffusivities are higher that expected from parameterization, possibly reflecting the proximity of the cryotopography.

Flow and mixing around a glacier tongue

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