Melting temperature changes during slip across subglacial cavities drive basal mass exchange

Melting temperature changes during slip across subglacial cavities drive basal mass exchange
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滑过冰下空腔期间的融化温度变化驱动基础质量交换

DOI:
10.1017/jog.2021.107
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发表时间:
2022
影响因子:
3.4
通讯作者:
Riverman, Kiya L.
Riverman, Kiya L.
中科院分区:
地球科学3区
文献类型:
--
作者:
Rempel, Alan W.;Meyer, Colin R.;Riverman, Kiya L.

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冰川滑动的重要性激发了大量描述冰、液态水和河床物质之间热机械相互作用的文献。早期认识到在融化温度梯度跨越小床障碍导致了集中研究regardion。对较大障碍物下游冰变形率的限制的认识突出了空化的作用,随后在冰下排水的描述中获得了突出地位。在这里,我们表明,融化温度的变化,伴随着正应力的变化沿着附近的空腔和其他宏观排水元素的滑动冰界面引起明显的过冷和基底质量交换。这为广泛观察到的富含碎屑的层状基底冰层提供了一种新的形成机制的基础。
The importance of glacier sliding has motivated a rich literature describing the thermomechanical interactions between ice, liquid water and bed materials. Early recognition of the gradient in melting temperature across small bed obstacles led to focused studies of regelation. An appreciation for the limits on ice deformation rates downstream of larger obstacles highlighted a role for cavitation, which has subsequently gained prominence in descriptions of subglacial drainage. Here, we show that the changes in melting temperature that accompany changes in normal stress along a sliding ice interface near cavities and other macroscopic drainage elements cause appreciable supercooling and basal mass exchange. This provides the basis of a novel formation mechanism for widely observed laminated debris-rich basal ice layers.
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DOI: --
发表时间: 1975
影响因子: 3.4
作者:
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