Punctuated equilibrium of the surface above subglacial Lake Vostok in antarctica |
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| Authors: | V M Kotlyakov L N Vasiliev A B Kachalin M Yu Moskalevskii A S Tyuflin |
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| Institution: | (1) NASA Goddard Space Flight Center, Greenbelt, MD, USA;(2) Center for Space Research, University of Texas at Austin, Austin, TX, USA |
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| Abstract: | Progress in understanding the surface dynamics above the subglacial Lake Vostok is achieved owing to use of the ICESat satellite
laser elevation measurements, which enabled us to determine surface fluctuations with precision up to 3 cm. A new idea on
punctuated equilibrium of the surface above Lake Vostok is elaborated; this idea is concluded in irregular, sharp vertical
displacements of the ice surface by up to 40 cm. Deformation of the surface is accompanied with a common raising or lowering,
and with local vertical displacements up to 20 cm in amplitude. It has been proved experimentally that snow transport on the
surface above the lake causes only redistribution of snow and forms fractal structures that do not have any effect on surface
deformation. The form of the surface is not an inclined plane due to many bends that are particularly related to ice flowing
on the lake water area. |
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