A decade of change in the hydraulic connection between an Antarctic epishelf lake and the ocean
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...
Published in: | Journal of Glaciology |
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Language: | English |
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2012
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Online Access: | https://eprints.utas.edu.au/16204/ https://eprints.utas.edu.au/16204/1/Coleman,_Richard_Jour_of_Glac_2012.pdf |
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ftunivtasmania:oai:eprints.utas.edu.au:16204 2023-05-15T13:22:00+02:00 A decade of change in the hydraulic connection between an Antarctic epishelf lake and the ocean Galton-Fenzi, BK Hunter, JR Coleman, R Young, ND 2012-10-11 application/pdf https://eprints.utas.edu.au/16204/ https://eprints.utas.edu.au/16204/1/Coleman,_Richard_Jour_of_Glac_2012.pdf en eng https://eprints.utas.edu.au/16204/1/Coleman,_Richard_Jour_of_Glac_2012.pdf Galton-Fenzi, BK, Hunter, JR, 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, vol. 58, no. 208 , pp. 223-228 , doi:10.3189/2012JoG10J206 <http://dx.doi.org/10.3189/2012JoG10J206>. cc_utas Article PeerReviewed 2012 ftunivtasmania https://doi.org/10.3189/2012JoG10J206 2020-05-30T07:30:08Z 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. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Journal of Glaciology University of Tasmania: UTas ePrints Antarctic East Antarctica Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) Beaver Lake ENVELOPE(68.295,68.295,-70.793,-70.793) Narrow Inlet ENVELOPE(163.700,163.700,-74.983,-74.983) Journal of Glaciology 58 208 223 228 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Galton-Fenzi, BK Hunter, JR Coleman, R Young, ND |
spellingShingle |
Galton-Fenzi, BK Hunter, JR Coleman, R Young, ND A decade of change in the hydraulic connection between an Antarctic epishelf lake and the ocean |
author_facet |
Galton-Fenzi, BK Hunter, JR Coleman, R Young, ND |
author_sort |
Galton-Fenzi, BK |
title |
A decade of change in the hydraulic connection between an Antarctic epishelf lake and the ocean |
title_short |
A decade of change in the hydraulic connection between an Antarctic epishelf lake and the ocean |
title_full |
A decade of change in the hydraulic connection between an Antarctic epishelf lake and the ocean |
title_fullStr |
A decade of change in the hydraulic connection between an Antarctic epishelf lake and the ocean |
title_full_unstemmed |
A decade of change in the hydraulic connection between an Antarctic epishelf lake and the ocean |
title_sort |
decade of change in the hydraulic connection between an antarctic epishelf lake and the ocean |
publishDate |
2012 |
url |
https://eprints.utas.edu.au/16204/ https://eprints.utas.edu.au/16204/1/Coleman,_Richard_Jour_of_Glac_2012.pdf |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) ENVELOPE(68.295,68.295,-70.793,-70.793) ENVELOPE(163.700,163.700,-74.983,-74.983) |
geographic |
Antarctic East Antarctica Amery Amery Ice Shelf Beaver Lake Narrow Inlet |
geographic_facet |
Antarctic East Antarctica Amery Amery Ice Shelf Beaver Lake Narrow Inlet |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Journal of Glaciology |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Shelf Journal of Glaciology |
op_relation |
https://eprints.utas.edu.au/16204/1/Coleman,_Richard_Jour_of_Glac_2012.pdf Galton-Fenzi, BK, Hunter, JR, 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, vol. 58, no. 208 , pp. 223-228 , doi:10.3189/2012JoG10J206 <http://dx.doi.org/10.3189/2012JoG10J206>. |
op_rights |
cc_utas |
op_doi |
https://doi.org/10.3189/2012JoG10J206 |
container_title |
Journal of Glaciology |
container_volume |
58 |
container_issue |
208 |
container_start_page |
223 |
op_container_end_page |
228 |
_version_ |
1766362807912103936 |