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The response of the subglacial Lake Vostok, Antarctica, to tidal and atmospheric pressure forcing
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The response of the subglacial Lake Vostok, Antarctica, to tidal and atmospheric pressure forcing

Author: Anja Wendt Affiliation: Dresden University of Technology, Institut für Planetare Geodäsie, 01062 Dresden, Germany. E-mail: awendt@ipg.geo.tu-dresden.deReinhard Dietrich Affiliation: Dresden University of Technology, Institut für Planetare Geodäsie, 01062 Dresden, Germany. E-mail: awendt@ipg.geo.tu-dresden.deJens Wendt Affiliation: Dresden University of Technology, Institut für Planetare Geodäsie, 01062 Dresden, Germany. E-mail: awendt@ipg.geo.tu-dresden.deMathias Fritsche Affiliation: Dresden University of Technology, Institut für Planetare Geodäsie, 01062 Dresden, Germany. E-mail: awendt@ipg.geo.tu-dresden.deValery Lukin Affiliation: Arctic and Antarctic Research Institute, Russian Antarctic Expedition, ul. Beringa 38, 199397 St. Petersburg, Russia; et al; All authors
Edition/Format: Article Article : English
Publication:Geophysical Journal International, v161 n1 (April 2005): 41-49
Other Databases: WorldCatWorldCat
Summary:
Lake Vostok is the largest subglacial lake in Antarctica. We show that as a result of its size tidal and atmospheric pressure forcings are large enough to induce vertical displacements of the ice surface above the lake. These effects have been modelled assuming equilibrium tides and an inverse barometer response based on mass conservation. Differences in the tidal potential on the area of the lake result in height  Read more...
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Document Type: Article
All Authors / Contributors: Anja Wendt Affiliation: Dresden University of Technology, Institut für Planetare Geodäsie, 01062 Dresden, Germany. E-mail: awendt@ipg.geo.tu-dresden.de; Reinhard Dietrich Affiliation: Dresden University of Technology, Institut für Planetare Geodäsie, 01062 Dresden, Germany. E-mail: awendt@ipg.geo.tu-dresden.de; Jens Wendt Affiliation: Dresden University of Technology, Institut für Planetare Geodäsie, 01062 Dresden, Germany. E-mail: awendt@ipg.geo.tu-dresden.de; Mathias Fritsche Affiliation: Dresden University of Technology, Institut für Planetare Geodäsie, 01062 Dresden, Germany. E-mail: awendt@ipg.geo.tu-dresden.de; Valery Lukin Affiliation: Arctic and Antarctic Research Institute, Russian Antarctic Expedition, ul. Beringa 38, 199397 St. Petersburg, Russia; Alexander Yuskevich Affiliation: Aerogeodeziya, ul. Bukharestskaya 8, 192102 St. Petersburg, Russia; Andrey Kokhanov Affiliation: Aerogeodeziya, ul. Bukharestskaya 8, 192102 St. Petersburg, Russia; Anton Senatorov Affiliation: Aerogeodeziya, ul. Bukharestskaya 8, 192102 St. Petersburg, Russia; Kazuo Shibuya Affiliation: National Institute of Polar Research, Polar Research Resources Center, Kaga, 1-19-10, Itabashi-ku, 173-8515 Tokyo, Japan; Koichiro Doi Affiliation: National Institute of Polar Research, Polar Research Resources Center, Kaga, 1-19-10, Itabashi-ku, 173-8515 Tokyo, Japan; et al
ISSN:0956-540X
Language Note: English
Unique Identifier: 5153567481
Notes: Accepted 2004 December 23. Received 2004 November 17; in original form 2004 July 5
Number of Figures: 11
Number of Tables: 5
Number of Formulas: 8
Number of References: 42
Awards:
Other Titles: Tides and IBE in Lake Vostok/Antarctica
Responsibility: A. Wendt et al.

Abstract:

Lake Vostok is the largest subglacial lake in Antarctica. We show that as a result of its size tidal and atmospheric pressure forcings are large enough to induce vertical displacements of the ice surface above the lake. These effects have been modelled assuming equilibrium tides and an inverse barometer response based on mass conservation. Differences in the tidal potential on the area of the lake result in height changes with amplitudes of a few millimetres for the largest diurnal and semidiurnal tides with maximum values at the southern end of the lake. Air pressure differences above the lake cause a differential inverse barometer effect (IBE) with resulting height changes of up to 40 mm on timescales from days to weeks. Both effects could be verified by differential Global Positioning System (GPS) observations in the southern part of the lake during the 2001/2002 and 2002/2003 summer seasons. The measured amplitudes and phases of the main constituents correspond to the respective values of the differential equilibrium tides. ERS-1& 2 tandem interferograms of 1996 were used to analyse the spatial pattern of the surface displacement. For the southern part of the lake, these measurements reveal a bulge with a wide flexure zone of varying amplitude but a similar geometry. A quasi-simultaneous pair of interferograms from the northern and the southern part of the lake respectively, demonstrates surface height changes of opposite sign in both areas. Therefore, it can be concluded that the associated water redistribution as a result of tides and changing atmospheric pressure forms an additional component of the overall water circulation in the lake.

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