A Detailed Postglacial Retreat Chronology for the Lambert Glacier, East Antarctica

这一奖项是为了支持一年的资金，以制作更新世晚期高位和随后兰伯特冰川及其在南极洲的支流退缩的日期记录。这些冰川构成了东南极冰盖最大的流出系统之一，消耗了约10%的面积。宇宙成因的同位素将被用来测定两个地点的冰川最大冰川和更年轻的后退冰川的巨石的年龄；一个是在莫森悬崖的兰伯特冰川上，另一个是在门齐斯山的费希尔冰川上。这些地点是在1997/98年度绘制地图和抽样的。这项研究的目标是重建从最后一次冰盛期到现在的兰伯特盆地的冰面。特别是，对莫森冰川冰川序列的测年将制约兰伯特冰川本身的表面下降历史，表明这一巨大的出口冰川是迅速还是逐渐从冰川最大位置撤退。这项工作将补充普里兹湾海洋研究的证据，并将使人们能够与罗斯海地区的冰川消融进行比较。重建还将有助于确定兰伯特盆地的冰负荷历史，用于均衡回弹建模和大地测量研究。

This award is for support for one year of funding to produce a dated record of the late Pleistocene highstand and subsequent retreat of the Lambert Glacier and its tributaries in East Antarctica. These glaciers comprise one of the largest outflow systems in the East Antarctic ice sheet, draining ~ 10% of its area. Cosmogenic isotopes will be used to date boulders from glacial maximum moraines and younger retreat moraines at two sites; on the Lambert Glacier at the Mawson Escarpment, and on the Fisher Glacier, at Mt Menzies. These sites were mapped and sampled in 1997/98. The goal of this study is to produce an ice-surface reconstruction of the Lambert Basin from the last glacial maximum to present. In particular, dating the moraine sequence in the Mawson Escarpment will constrain the surface lowering history of the Lambert Glacier itself, indicating whether this giant outlet glacier withdrew rapidly or gradually from its glacial maximum position. This work will complement evidence from marine studies in Prydz Bay and will allow comparisons to be made with the deglaciation of the Ross Sea region. The reconstruction will also help to define the ice loading history of the Lambert Basin for isostatic rebound modeling and geodetic studies.