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A decade of change in the hydraulic connection between an Antarctic epishelf lake and the ocean
journal contribution
posted on 2023-05-17, 10:37 authored by Benjamin Galton-FenziBenjamin Galton-Fenzi, John HunterJohn Hunter, Richard ColemanRichard Coleman, Neal YoungNeal YoungObservations 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.
History
Publication title
Journal of GlaciologyVolume
58Issue
208Pagination
223-228ISSN
0022-1430Department/School
Institute for Marine and Antarctic StudiesPublisher
Int Glaciol SocPlace of publication
Lensfield Rd, Cambridge, England, Cb2 1ErRights statement
Copyright 2011 International Glaciological SocietyRepository Status
- Restricted