HR: 0800h
AN: U31B-0303    [Abstracts]
TI: Mass Balance of the ice Sheet Above the Southern Part of Subglacial Lake Vostok Based on Field Observations
AU: Richter, A
EM: richter@ipg.geo.tu-dresden.de
AF: TU Dresden, Institut fuer Planetare Geodaesie, Dresden, 01062, Germany
AU: Popov, S
EM: spopov67@yandex.ru
AF: Polar Marine Geosurvey Expedition, ul. Pobeda 24, St. Petersburg, 188512, Russian Federation
AU: * Dietrich, R
EM: dietrich@IPG.geo.tu-dresden.de
AF: TU Dresden, Institut fuer Planetare Geodaesie, Dresden, 01062, Germany
AU: Lukin, V
EM: lukin@aari.nw.ru
AF: Arctic and Antarctic Research Institute, ul. Beringa 38, St. Petersburg, 199397, Russian Federation
AU: Fritsche, M
EM: fritsche@IPG.geo.tu-dresden.de
AF: TU Dresden, Institut fuer Planetare Geodaesie, Dresden, 01062, Germany
AU: Lipenkov, V
EM: lipenkov@aari.nw.ru
AF: Arctic and Antarctic Research Institute, ul. Beringa 38, St. Petersburg, 199397, Russian Federation
AU: Yuskevich, A
EM: aero@agspb.ru
AF: Aerogeodeziya, ul. Bukharestskaya, St. Petersburg, 192102, Russian Federation
AU: Wendt, J
EM: jwendt@cecs.cl
AF: Centro de Estudios Cientificos, Av. Arturo Prat 514, Valdivia, 5110466, Chile
AU: Senatorov, A
EM: aero@agspb.ru
AF: Aerogeodeziya, ul. Bukharestskaya, St. Petersburg, 192102, Russian Federation
AU: Masolov, V
EM: masolov@polarex.spb.ru
AF: Polar Marine Geosurvey Expedition, ul. Pobeda 24, St. Petersburg, 188512, Russian Federation
AB: In the Antarctic field season 2001/2002, geodetic GPS markers were installed in and around Vostok station and observed for the first time. In the following field season, these observations were repeated. During the field season 2006/2007, a third observation campaign was carried out. These repeated in-situ measurements provide the basis for the precise determination of the local flow direction and velocity of the ice sheet, as well as height change rates for the GPS markers. The changes of the internal geometry between the markers were used for a strain analysis in order to quantify the convergence/divergence and acceleration of the ice flow around Vostok station. We present our results on mass balance state of both the floating ice sheet and the subglacial water body. For this purpose, we combined the marker displacements determined by geodetic means with representative surface accumulation rates and precise ice thickness data from ground-based radar-echo sounding. Due to the hydrostatic equilibrium of the floating ice some conclusions are valid for the entire lake area.
DE: 0762 Mass balance (1218, 1223)
DE: 0776 Glaciology (1621, 1827, 1863)
SC: Union [U]
MN: 2007 Fall Meeting