Atmospheric and Oceanographic Signatures in the Ice Shelf Channel Morphology of Roi Baudouin Ice Shelf, East Antarctica, Inferred From Radar Data
Atmospheric and Oceanographic Signatures in the Ice Shelf Channel Morphology of Roi Baudouin Ice Shelf, East Antarctica, Inferred From Radar Data
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根据雷达数据推断的东南极洲罗伊博杜安冰架冰架航道形态的大气和海洋特征
DOI：
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
K. Matsuoka
中科院分区：
文献类型：
--
作者：
R. Drews;C. Schannwell;T. Ehlers;R. Gladstone;F. Pattyn;K. Matsuoka
南极洲周围的冰架可以为出口冰川提供背应力，并控制冰盖质量损失。它们通常包含狭窄的薄冰带，称为冰架通道。冰架通道形态可以通过表面凹陷来解释，并显示出与流线的连接和偏转。使用冰流建模和雷达，我们研究在罗伊博杜安冰架的冰架通道。它们与盛行的东风斜向排列。在浅层雷达地层中，向斜和背斜叠加分别出现在上风侧和下风侧下方。结构是水平和垂直连贯的，除了附近的冰架通道交界处的模式随深度的结构变化。深层截形近基部切口。使用冰流模拟，我们表明，地层是109倍更敏感的大气变化比海洋的变化。这是由于不断向浮动调整。我们认为，浅层地层中的向斜-背斜对是由迎风侧的优先积雪和顺风侧的风蚀造成的。这导致冰架通道每年顺风偏转数米。深度变化的结构表明，形成的冰架通道连接底部融化。我们的结论是，许多冰架通道播种在接地线。它们的形态在更远的海面上由冰动力学、海洋和大气在不同的长度尺度上塑造。这些过程的作用比大多数冰，大气和海洋模型所捕获的更精细（亚公里）的尺度，但冰架通道的动力学可能对冰架稳定性有更广泛的影响。
Ice shelves around Antarctica can provide back stress for outlet glaciers and control ice sheet mass loss. They often contain narrow bands of thin ice termed ice shelf channels. Ice shelf channel morphology can be interpreted through surface depressions and exhibits junctions and deflections from flowlines. Using ice flow modeling and radar, we investigate ice shelf channels in the Roi Baudouin Ice Shelf. These are aligned obliquely to the prevailing easterly winds. In the shallow radar stratigraphy, syncline and anticline stacks occur beneath the upwind and downwind side, respectively. The structures are horizontally and vertically coherent, except near an ice shelf channel junction where patterns change structurally with depth. Deeper layers truncate near basal incisions. Using ice flow modeling, we show that the stratigraphy is ∼9 times more sensitive to atmospheric variability than to oceanic variability. This is due to the continual adjustment toward flotation. We propose that syncline‐anticline pairs in the shallow stratigraphy are caused by preferential snow deposition on the windward side and wind erosion at the downwind side. This drives downwind deflection of ice shelf channels of several meters per year. The depth variable structures indicate formation of an ice shelf channel junction by basal melting. We conclude that many ice shelf channels are seeded at the grounding line. Their morphology farther seaward is shaped on different length scales by ice dynamics, the ocean, and the atmosphere. These processes act on finer (subkilometer) scales than are captured by most ice, atmosphere, and ocean models, yet the dynamics of ice shelf channels may have broader implications for ice shelf stability.
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来自南极洲松岛冰川高分辨率 DEM 记录的冰架基础融化速率
DOI：
10.5194/tc-2018-209
发表时间：
2018
期刊：
The Cryosphere Discussions
影响因子：
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作者：
Shean, David E.;Joughin, Ian R.;Dutrieux, Pierre;Smith, Benjamin E.;Berthier, Etienne
通讯作者：
Berthier, Etienne
夏季地表融化通过增强通道化基底融化而使彼得曼冰川冰架变薄
影响因子：
3.4
作者：
WASHAM, PETER;NICHOLLS, KEITH W.;MÜNCHOW, ANDREAS;PADMAN, LAURIE
通讯作者：
PADMAN, LAURIE
影响因子：
5.2
作者：
Dutrieux, Pierre;Stewart, Craig;Steffen, Konrad
通讯作者：
Steffen, Konrad
影响因子：
30.7
作者：
Fuerst, Johannes Jakob;Durand, Gael;Gagliardini, Olivier
通讯作者：
Gagliardini, Olivier
影响因子：
3.4
作者：
Gladish, Carl V.;Holland, David M.;Price, Stephen F.
通讯作者：
Price, Stephen F.