Observations of flexural waves on the Erebus Ice Tongue, McMurdo Sound, Antarctica, and nearby sea ice
Observations of flexural waves on the Erebus Ice Tongue, McMurdo Sound, Antarctica, and nearby sea ice
复制标题
南极洲麦克默多海峡埃里伯斯冰舌和附近海冰上弯曲波的观测
作者：
V. Squire;W. Robinson;M. Meylan;T. Haskell
摘要本文介绍了南极洲麦克默多海峡埃里伯斯冰舌（EGT）弯曲振动的新应变数据，并在频域中进行了分析。这些数据是在1989年11月收集的，就在1990年3月冰舌最近一次崩解前3个月。在EGT和附近海冰上采集的应变测量结果中均发现了以50 s为中心的宽带振荡。振荡至少部分地以约65 ms-1的相速度在远离鼻状部朝向接地线的方向上传播，而不是完全由于EGT中的驻波图案。海冰和EGT之间的耦合模型，提出并比较合理，以及与数据。
Abstract New strain data relating to flexural oscillations of the Erebus Glacier Tongue (EGT), McMurdo Sound, Antarctica, are presented and are analysed in the frequency domain. The data were collected during November 1989, just 3 months prior to the most recent calving of the ice tongue which occurred in March 1990. A broad-band oscillation centred on 50 s is found in both the strain measurements collected on the EGT and those collected on the sea ice nearby. The oscillation is shown, at least in part, to be propagating with a phase velocity of approximately 65 ms−1 in a direction away from the snout towards the grounding line, rather than being wholly due to a standing-wave pattern in the EGT. A coupling model between the sea ice and the EGT is proposed and is shown to compare reasonably well with the data.