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The influence of an Antarctic glacier tongue on near-field ocean circulation and mixing

Citation

Stevens, CL and McPhee, MG and Forrest, AL and Leonard, GH and Stanton, T and Haskell, TG, The influence of an Antarctic glacier tongue on near-field ocean circulation and mixing, Journal of Geophysical Research: Oceans, 119, (4) pp. 2344-2362. ISSN 2169-9291 (2014) [Refereed Article]


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Copyright Statement

Copyright 2014 American Geophysical Union

DOI: doi:10.1002/2013JC009070

Abstract

In situ measurements of flow and stratification in the vicinity of the Erebus Glacier Tongue, a 12 km long floating Antarctic glacier, show the significant influence of the glacier. Three ADCPs (75, 300, and 600 kHz) were deployed close (<50 m) to the sidewall of the glacier in order to capture near-field flow distortion. Scalar (temperature and conductivity) and shear microstructure profiling captured small-scale vertical variability. Flow magnitudes exceeded 0.3 m s21 through a combination of tidal flow (8 cm s21) and a background/residual flow (410 cm s21) flowing to the NW. Turbulence was dominated by deeper mixing during spring tide, likely indicative of the role of bathymetric variation which locally forms an obstacle as great as the glacier. During the neap tide, near-surface mixing was as energetic as that seen in the spring tide, suggesting the presence of buoyancy-driven near-surface flows. Estimates of integrated dissipation rate suggest that these floating extensions of the Antarctic ice sheet alter energy budgets through enhanced dissipation, and thus influence coastal near-surface circulation.

Item Details

Item Type:Refereed Article
Keywords:ice tongues, mixing, turbulence
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical Oceanography
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Environment not elsewhere classified
Author:Forrest, AL (Dr Alexander Forrest)
ID Code:91376
Year Published:2014
Web of Science® Times Cited:4
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2014-05-15
Last Modified:2017-11-30
Downloads:0

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