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

该奖项是为了支持为期一年的资助，以制作晚更新世高地和随后东南极洲兰伯特冰川及其支流撤退的日期记录。这些冰川构成了南极东部冰原最大的流出系统之一，流出约占其面积的10%。宇宙成因同位素将用于测定两个地点的冰川最大值冰碛和较年轻的退缩冰碛的岩石年代；在莫森悬崖的兰伯特冰川和孟席斯山的费舍尔冰川上。这些地点已于1997/98年度绘制地图及抽样。本研究的目的是对兰伯特盆地从末次极大期到现在的冰面进行重建。特别是，对莫森断崖的冰碛序列进行定年，将约束兰伯特冰川本身的地表下降历史，表明这个巨大的出口冰川是迅速地还是逐渐地从其冰川最大位置退缩。这项工作将补充普里兹湾海洋研究的证据，并将与罗斯海地区的冰川消融进行比较。重建也将有助于确定兰伯特盆地的冰加载历史，以进行均衡反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.