Vostok VK-FGT1 ice flow simulation Parrenin, F.; Rémy, F.; Ritz, C.; Siegert, M.J.; Jouzel, J. Parrenin, F. Rémy, F. Ritz, C. Siegert, M.J. Jouzel, J. earth science/paleoclimate/climate reconstructions|ice cores (depth,null,null,meter,null,climate reconstructions|ice cores,null,null,N,3G depth) earth science/paleoclimate/climate reconstructions|ice cores (gas age,null,null,calendar year before present,null,climate reconstructions|ice cores,null,null,N,calendar years before 1998 (drilling date)) earth science/paleoclimate/climate reconstructions|ice cores (ice age,null,null,calendar year before present,null,climate reconstructions|ice cores,null,null,N,calendar years before 1998 (drilling date)) earth science/paleoclimate/climate reconstructions|ice cores (surface temperature,null,null,degree Celsius,annual,climate reconstructions|ice cores,null,null,N,null) earth science/paleoclimate/climate reconstructions|ice cores (depth,null,null,meter,null,climate reconstructions|ice cores,null,null,N,depth in ice equivalent firn and bubbly ice have been compressed to have a uniform density) earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,centimeter per year,null,ice cores,null,null,N,ice accumulation rate) earth science/paleoclimate/ice cores (thinning function,bulk ice,null,dimensionless,null,ice cores,null,null,N,ratio of a layer thickness to its initial thickness) earth science/paleoclimate/ice cores (horizontal displacement,null,null,meter,null,ice cores,null,null,N,horizontal origin of the ice expressed in m downstream the beginning of the flow line (Ridge B)) earth science/paleoclimate/ice core earth science/paleoclimate/ice core (Vostok>LATITUDE -78.47>LONGITUDE 106.8) We have used new spaceborne (elevation) and airborne (ice thickness) data to constrain a 2D1/2 model of snow accumulation and ice flow along the Ridge B-Vostok station ice flow line (East Antarctica). We show that new evaluations of the ice flow line geometry (from the surface elevation), ice thickness (from low-frequency radar data), and basal melting and sliding change significantly the chronology of the Vostok ice core. This new Vostok dating model reconciles orbital and glaciological timescales and is in good agreement with the Dome Fuji glaciological timescale. At the same time, the new model shows significantly older ages than the previous GT4 timescale for the last glacial part, being thus in better agreement with the GRIP and GISP2 chronologies. STUDY NOTES: Ice age, gas age (computed with the Goujon, JGR, 2003 model), Accumulation, vertical thinning function, temperature and ice origin as produced by the VK-FGT1 ice flow simulation. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Parrenin, F. Investigator : Rémy, F. Investigator : Ritz, C. Investigator : Siegert, M.J. Investigator : Jouzel, J. 2012-10-15 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/13419 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/vostok2004flow.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/vostok2004flow.txt English https://www.ncdc.noaa.gov/paleo/study/13419 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/vostok/vostok2004flow.txt Parrenin, F., F. Rémy, C. Ritz, M.J. Siegert, and J. Jouzel. 2004. New modelling of the Vostok ice flow line and implication for the glaciological chronology of the Vostok ice core. Journal of Geophysical Research, Atmospheres, 109, D20102. DOI: 10.1029/2004JD004561 START YEAR: 715596 cal yr BP * END YEAR: 0 cal yr BP 106.8 -78.47 106.8 -78.47