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A decade of change in the hydraulic connection between an Antarctic epishelf lake and the ocean


Galton-Fenzi, BK and Hunter, JR and Coleman, R and Young, N, A decade of change in the hydraulic connection between an Antarctic epishelf lake and the ocean, Journal of Glaciology, 58, (208) pp. 223-228. ISSN 0022-1430 (2012) [Refereed Article]

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Copyright Statement

Copyright 2011 International Glaciological Society

DOI: doi:10.3189/2012JoG10J206


Observations of the water level in Beaver Lake, an epishelf lake in East Antarctica, show a regular tidal signal that is lagged and attenuated from the tides beneath the adjacent Amery Ice Shelf. The phase lag and amplitude attenuation can be created by a narrow inlet connection between Beaver Lake and the cavity beneath the Amery Ice Shelf. A forced linear damped oscillator is used to determine the inlet dimensions that are required to produce the observed phase lag and amplitude attenuation. The model shows that the observations are consistent with a tidal flow that is restricted by the drag created by flow in the narrow inlet. Analysis shows that the phase lag and amplitude attenuation of the tides in Beaver Lake has increased over the years 19912002, probably due to a thickening of the overlying ice shelf. The response is sensitive to subtle variations in the dimensions of the inlet.

Item Details

Item Type:Refereed Article
Keywords:epishelf lake, ice shelves, ocean, tides, Amery Ice Shelf, Antarctica
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Physical oceanography
Objective Division:Environmental Management
Objective Group:Management of Antarctic and Southern Ocean environments
Objective Field:Antarctic and Southern Ocean oceanic processes
UTAS Author:Galton-Fenzi, BK (Dr Ben Galton-Fenzi)
UTAS Author:Hunter, JR (Dr John Hunter)
UTAS Author:Coleman, R (Professor Richard Coleman)
UTAS Author:Young, N (Mr Neal Young)
ID Code:76073
Year Published:2012
Web of Science® Times Cited:6
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2012-02-27
Last Modified:2017-10-25

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