Glacial geomorphology of Marguerite Bay Palaeo-Ice stream, western Antarctic Peninsula

Glacial geomorphology of Marguerite Bay Palaeo-Ice stream, western Antarctic Peninsula
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南极半岛西部玛格丽特湾古冰流的冰川地貌

DOI:
10.1080/17445647.2013.829411
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发表时间:
2013
期刊:
影响因子:
2.2
通讯作者:
Livingstone S
Livingstone S
中科院分区:
地球科学3区
文献类型:
--
作者:
Livingstone S

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本文展示了南极半岛西部玛格丽特湾一条主要古冰流河床上 17,000 多个地貌的冰川地貌图。该地图是使用多次海洋研究巡航的各种地球物理数据集编制的。确定了八种冰川地貌类型:巨型冰川线状、峭壁和尾部、鲸背、凿刻、凹槽和流线型基岩、接地区楔形、冰下融水通道、沟壑和通道以及冰山冲刷。该地图代表了可供仔细研究的最完整的海洋冰流特征之一,这些数据对于重建以前的冰盖动力学、测试冰盖数值模型以及了解冰流下方冰下床形的形成具有很大潜力。特别是,他们记录了自末次盛冰期以来古冰流流动和退缩的复杂地床形态特征,其特征是相当大的空间变化,并受到底层地质的强烈影响。该地图的比例为 1: 750,000,设计为 A2 尺寸打印,覆盖面积为 128,420 平方公里。
This paper presents a glacial geomorphological map of over 17,000 landforms on the bed of a major palaeo-ice stream in Marguerite Bay, western Antarctic Peninsula. The map was compiled using various geophysical datasets from multiple marine research cruises. Eight glacial landform types are identified: mega-scale glacial lineations, crag-and-tails, whalebacks, gouged, grooved and streamlined bedrock, grounding-zone wedges, subglacial meltwater channels, gullies and channels, and iceberg scours. The map represents one of the most complete marine ice-stream signatures available for scrutiny, and these data hold much potential for reconstructing former ice sheet dynamics, testing numerical ice sheet models, and understanding the formation of subglacial bedforms beneath ice streams. In particular, they record a complex bedform signature of palaeo-ice stream flow and retreat since the last glacial maximum, characterised by considerable spatial variability and strongly influenced by the underlying geology. The map is presented at a scale of 1: 750,000, designed to be printed at A2 size, and encompasses an area of 128,420 km2.
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