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


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Galton-Fenzi, BK and Hunter, JR and Coleman, R and Young, ND (2012) 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

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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 1991–2002, probably due to a thickening of the overlying ice
shelf. The response is sensitive to subtle variations in the dimensions of the inlet.

Item Type: Article
Journal or Publication Title: Journal of Glaciology
Page Range: pp. 223-228
ISSN: 0022-1430
Identification Number - DOI: 10.3189/2012JoG10J206
Additional Information:

Copyright 2012 IGS.

Date Deposited: 19 Mar 2013 01:03
Last Modified: 18 Nov 2014 04:49
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