Morphology and Dynamics of Ice Rises
Morphology and Dynamics of Ice Rises
复制标题
冰升的形态和动力学
DOI：
10.3189/s0022143000010261
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发表时间：
1980
影响因子：
3.4
通讯作者：
T. J. O. Sanderson
中科院分区：
文献类型：
--
作者：
P. J. Martin;T. J. O. Sanderson
摘要介绍了南极半岛东海岸四个冰隆的剖面调查。在巴特勒岛的速度测量也进行了。冰隆表现为冻结在平坦水平基岩上的微型冰帽，为研究冰流规律提供了一个简单的系统。变形主要是由于冰体的剪切作用。流速测量提供的流动定律值为n = 3.13±0.52。每一个冰脊的一边是冰架，另一边是公海。在远海，剖面图与稳态理论剖面图吻合得很好，温度为-13.5 °C，应力范围为0.5-1.3巴时，剖面图提供的值为。向冰架方向剖面变长，偏离理论剖面。这可能是由于冰架中的压缩应力导致接地线沿倾斜基岩向下迁移。在山顶区域没有发现明显的异常行为。
Abstract Profile surveys are presented of four ice rises on the east coast of the Antarctic Peninsula. On Butler Island velocity measurements were also made. The ice rises behave as miniature ice caps frozen to flat horizontal bedrock and provide a simple system for the study of laws of ice flow. Deformation is principally by shear through the ice mass. Velocity measurements provide a value of n = 3.13±0.52 for the flow law . Each ice rise is bounded on one side by ice shelf and on the other side by open sea. Towards open sea the profiles are found to agree well with steady-state theoretical profiles and they supply a value of for temperature – 13.5°C and stress range 0.5–1.3 bar. Towards ice shelf the profiles are elongated and they deviate from the theoretical profile. This may be due to compressive stress in the ice shelf causing migration of the grounding line down sloping bedrock. No significantly anomalous behaviour is found in the summit region.