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首页> 外文期刊>Journal of geophysical research. Earth Surface: JGR >Basal mechanics of ice streams: Insights from the stick-slip motion of Whillans Ice Stream, West Antarctica
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Basal mechanics of ice streams: Insights from the stick-slip motion of Whillans Ice Stream, West Antarctica

机译：冰流的基本力学：西南极Whillans冰流的粘滑运动的见解

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摘要

The downstream portion of Whillans Ice Stream, West Antarctica, moves primarily by stick-slip motion. The observation of stick-slip motion suggests that the bed is governed by velocity-weakening physics and that the basal physics is more unstable than suggested by laboratory studies. The stick-slip cycle of Whillans Ice Plain exhibits substantial variability in both the duration of sticky periods and in slip magnitude. To understand this variability, we modeled the forces acting on the ice stream during the stick phase of the stick-slip cycle. The ocean tides introduce changes in the rate at which stress is applied to the ice plain. Increased loading rates promote earlier failure and vice versa. Results show that the bed of Whillans Ice Stream strengthens over time (healing) during the quiescent intervals in the stick-slip cycle, with the bed weakening during slip events. The time-dependent strengthening of the ice plain bed following termination of slip events indicates that the strength of the bed may vary by up to 0.35 kPa during the course of a single day.
机译：西南极洲Whillans冰河的下游部分主要通过粘滑运动来移动。粘滑运动的观察表明，该床受速度弱化物理学支配，而基础物理学比实验室研究表明的更加不稳定。 Whillans冰原的粘滑周期在黏着期的持续时间和滑移量上都表现出很大的变化。为了理解这种可变性，我们对在粘滑循环的粘着阶段作用在冰流上的力进行了建模。洋潮引起了向冰原施加应力的速率的变化。增加的加载速率会促进早期故障，反之亦然。结果表明，Whillans冰流的床在粘滑周期的静止时间间隔内随着时间的流逝而增强（愈合），而在滑移事件中床减弱。滑移事件终止后，冰原床的时间依赖性增强表明，在一天的过程中，冰床的强度可能变化高达0.35 kPa。

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