A 'continuity-index' for assessing ice-sheet dynamics from radar-sounded internal layers
A 'continuity-index' for assessing ice-sheet dynamics from radar-sounded internal layers
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DOI：
10.1016/j.epsl.2012.04.034
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发表时间：
2012-06-15
影响因子：
5.3
通讯作者：
Vaughan, David G.
中科院分区：
文献类型：
--
作者：
Karlsson, Nanna B.;Rippin, David M.;Vaughan, David G.
极地冰盖的无线电回波探测(RES)揭示了广泛的内部分层。内部分层的连续性程度包含有关冰流场的关键信息，但以前对该参数的分析仅限于定性分类。在这里，我们提出了一种新的定量分析内层连续性的方法，称为连续性指数。当应用于西南极松岛冰川的数据时，新方法清楚地识别出与当前冰速场相对应的内部层的不连续连续体。这一分析进一步支持了主干和支流自内部分层沉积以来不太可能发生实质性迁移的观点。值得注意的是，我们分析内部层的新方法可以很容易地在RES数据集中移植，为以数据为导向的南极洲和格陵兰岛大片地区过去和现在的流动动态评估提供了希望。(C)2012爱思唯尔B.V.保留所有权利。
Radio-echo sounding (RES) of polar ice sheets reveals extensive internal layering. The degree of continuity of internal layering holds critical information about the ice-flow field, but previous analyses of this parameter have been limited to qualitative classifications. Here we present a new quantitative method for analyzing internal layer continuity named the continuity-index. When applied to data from Pine Island Glacier, West Antarctica, the new method clearly identifies a continuum of discontinuity of internal layers that corresponds with the current ice-velocity field. The analysis provides further support that the main trunk and tributaries are unlikely to have undergone substantial migration since the deposition of the internal layering. Significantly, our new method for analyzing internal layers is readily transferable across RES datasets, offering promise for data-led assessments of past and present flow dynamics across large areas of Antarctica and Greenland. (C) 2012 Elsevier B.V. All rights reserved.