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.

中文翻译：

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从雷达数据推断南极东部Roi Baudouin冰架的冰架通道形态中的大气和海洋学特征

南极洲周围的冰架可以为出口冰川提供反应力，并控制冰盖的质量损失。它们通常包含窄带的薄冰，称为冰架通道。冰架通道的形态可以通过表面凹陷来解释，并表现出流线的连接和偏转。使用冰流建模和雷达，我们研究了Roi Baudouin冰架中的冰架通道。它们与盛行的东风倾斜。在浅层雷达地层中，顺风和背斜叠层分别出现在上风和下风的下方。这些结构在水平和垂直方向上是连贯的，除了在冰架通道交界处附近，那里的格局在结构上随深度而变化。较深的层在基底切口附近截断。使用冰流建模，我们表明，地层学对大气变化的敏感性比对海洋变化的敏感性高约9倍。这是由于对浮选的持续调整。我们认为，浅层地层中的斜向-斜线对是由上风侧的优先积雪和顺风侧的风蚀引起的。这导致每年几米的冰架通道顺风偏转。深度可变结构表明通过基础融化形成了冰架通道结。我们得出的结论是，许多冰架通道播种在接地线上。它们的远海形态由冰动力学，海洋和大气在不同的长度尺度上形成。与大多数冰，大气和海洋模型所捕获的相比，这些过程的作用范围更小（以千米为单位），