Connected subglacial lake drainage beneath Thwaites Glacier, West Antarctica
Connected subglacial lake drainage beneath Thwaites Glacier, West Antarctica
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西南极洲思韦茨冰川下方相连的冰下湖排水系统
DOI：
10.5194/tc-11-451-2017
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
I. Joughin
中科院分区：
文献类型：
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作者：
Ben E. Smith;N. Gourmelen;A. Huth;I. Joughin
抽象的。我们提出了传统的和条带测高数据从CryoSat-2，揭示了一个系统的冰下湖泊，排水在2013年6月和2014年1月之间的Thwaites冰川，西南极洲（TWG）的中部。大部分的排水发生在不到6个月的时间里，三个湖泊之间有一个明显的连接，跨度超过130公里。对冰川床的水文势分析表明，有大量的小型封闭盆地，这些盆地应该能够捕获冰下融化产生的水，尽管观察到的大规模水运动表明，水有时会在局部逆着表观势梯度移动，至少在湖泊排水事件期间是这样。这表明，水文势图预测冰下水流的能力存在重大局限性。根据融化速率图的解释表明，这种类型的湖泊排水应该每20-80年发生一次，这取决于河床水流的连通性。虽然我们观察到TWG下游部分的加速就在湖泊排水开始之前，排水和冰川的任何速度变化之间没有明确的联系。
Abstract. We present conventional and swath altimetry data from CryoSat-2, revealing a system of subglacial lakes that drained between June 2013 and January 2014 under the central part of Thwaites Glacier, West Antarctica (TWG). Much of the drainage happened in less than 6 months, with an apparent connection between three lakes spanning more than 130 km. Hydro-potential analysis of the glacier bed shows a large number of small closed basins that should trap water produced by subglacial melt, although the observed large-scale motion of water suggests that water can sometimes locally move against the apparent potential gradient, at least during lake-drainage events. This shows that there are important limitations in the ability of hydro-potential maps to predict subglacial water flow. An interpretation based on a map of the melt rate suggests that lake drainages of this type should take place every 20–80 years, depending on the connectivity of the water flow at the bed. Although we observed an acceleration in the downstream part of TWG immediately before the start of the lake drainage, there is no clear connection between the drainage and any speed change of the glacier.
活跃的西南极冰下湖的边界条件：对冰盖下水储存的影响
DOI：
10.5194/tc-8-15-2014
发表时间：
2014
期刊：
The Cryosphere
影响因子：
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作者：
Siegert M
通讯作者：
Siegert M