New modeling of the Vostok ice flow line and implication for the glaciological chronology of the Vostok ice core
New modeling of the Vostok ice flow line and implication for the glaciological chronology of the Vostok ice core
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DOI：
10.1029/2004jd004561
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发表时间：
2004-10
影响因子：
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通讯作者：
F. Parrenin;F. Rémy;C. Ritz;M. Siegert;J. Jouzel
中科院分区：
文献类型：
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作者：
F. Parrenin;F. Rémy;C. Ritz;M. Siegert;J. Jouzel
[1]我们已经使用新的航天器（海拔）和航空（冰厚度）数据，以约束雪积累和冰流沿着山脊B-东方站冰流线（东南极洲）的2D 1/2模型。我们表明，新的评估冰流线的几何形状（从表面高程），冰厚度（从低频雷达数据），和基底融化和滑动显着改变东方冰芯的年表。这个新的东方号测年模型调和了轨道和冰川时间尺度，并与富士圆顶冰川时间尺度非常一致。与此同时，新的模型显示了比以前的GT 4时间尺度更老的末次冰期部分的年龄，因此与GRIP和GISP 2年表更一致。
[1] 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.