An extensive subglacial lake and canyon system in Princess Elizabeth Land, East Antarctica
An extensive subglacial lake and canyon system in Princess Elizabeth Land, East Antarctica
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DOI：
10.1130/g37220.1
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发表时间：
2016-02-01
期刊：
影响因子：
5.8
通讯作者：
Siegert, Martin J.
中科院分区：
文献类型：
--
作者：
Jamieson, Stewart S. R.;Ross, Neil;Siegert, Martin J.
南极洲东部伊丽莎白公主地（PEL）的冰下景观由于缺乏冰厚度测量而知之甚少。这是有问题的，因为它对理解冰盖动态和景观和气候演变的重要性。为了解决这个问题，我们描述了冰盖下的地形，假设卫星图像中的冰面表达式与大规模的冰下特征。我们发现的证据表明，一个大的，以前未被发现的冰下排水网络隐藏在冰盖下的PEL。我们解释了一个离散的功能，是140 × 20公里的平面形式，和多个狭窄的蜿蜒的功能，延伸超过一个距离类似于1100公里。我们假设，这些都是构造控制，并涉及到一个大的冰下盆地，其中包含一个深水湖在内部的PEL连接到一系列的长，深峡谷。1公里深的峡谷的存在被证实在一些地方的无线电回声探测数据，排水分析表明，这些峡谷将直接冰下融水之间的海岸韦斯特福尔山和西冰架。
The subglacial landscape of Princess Elizabeth Land (PEL) in East Antarctica is poorly known due to a paucity of ice thickness measurements. This is problematic given its importance for understanding ice sheet dynamics and landscape and climate evolution. To address this issue, we describe the topography beneath the ice sheet by assuming that ice surface expressions in satellite imagery relate to large-scale subglacial features. We find evidence that a large, previously undiscovered subglacial drainage network is hidden beneath the ice sheet in PEL. We interpret a discrete feature that is 140 x 20 km in plan form, and multiple narrow sinuous features that extend over a distance of similar to 1100 km. We hypothesize that these are tectonically controlled and relate to a large subglacial basin containing a deep-water lake in the interior of PEL linked to a series of long, deep canyons. The presence of 1-km-deep canyons is confirmed at a few localities by radio-echo sounding data, and drainage analysis suggests that these canyons will direct subglacial meltwater to the coast between the Vestfold Hills and the West Ice Shelf.