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Airborne radar survey above Vostok region, east-central Antarctica: ice thickness and Lake Vostok geometry

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Abstract:

During the 1999-2000 Italian Expedition, an airborne radar survey was performed along 12 transects across Lake Vostok, Antarctica, and its western and eastern margins. Ice thickness, subglacial elevation and the precise location of lake boundaries were determined. Radar data confirm the geometry derived from previous surveys, but with some slight differences. We measured a length of up to 260 km, a maximum width of 81km and an area of roughly 14 000 km2. Along the major axis, from north to south, the ice thickness varies from 3800 to 4250 m, with a decreasing gradient. From west to east the ice thickness is fairly constant, except for two narrow strips located on the western and eastern margins, where it increases with high thickening rate. Over the lake the surface elevation increases from 3476 m a.s.l. (south) to 3525 (north), with a decreasing gradient, while the lake surface elevation decreases from -315 to -750 m a.s.l., with a decreasing gradient (absolute value). The ice- surface and lake-ceiling slopes suggest that the lake is in a state of hydrostatic equilibrium.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/172756502781831656

Publication date: January 1, 2002

More about this publication?
  • The Journal of Glaciology is published six times per year. It accepts submissions from any discipline related to the study of snow and ice. All articles are peer reviewed. The Journal is included in the ISI Science Citation Index.
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