Calving and rifting on the McMurdo Ice Shelf, Antarctica
Calving and rifting on the McMurdo Ice Shelf, Antarctica
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DOI：
10.1017/aog.2017.12
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发表时间：
2017-07-01
影响因子：
2.9
通讯作者：
Macayeal, Douglas R.
中科院分区：
文献类型：
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作者：
Banwell, Alison F.;Willis, Ian C.;Macayeal, Douglas R.
2016 年 3 月 2 日，几座小型的梯形板状冰山从麦克默多冰架的临海前部崩解，先前不活跃的裂谷扩大并扩展了约 3 公里，相当于其先前长度的 25%，为未来约 14 公里(2) 冰山的崩解奠定了基础。在这些事件发生后的 24 小时内，所有剩余的稳定冰架的陆地海冰都破裂了。这些事件由附近斯科特基地的延时摄像机目睹，并利用附近的地震和自动气象站数据、卫星图像和随后的地面观测将其置于背景中。尽管无法明确确定崩解和裂谷的确切触发因素，但地震记录显示，从南极洲以外的风暴源传播到麦克默多海峡的长周期（>10秒）海涌和高能、本地来源的短周期海涌的叠加组。
On 2 March 2016, several small en echelon tabular icebergs calved from the seaward front of the McMurdo Ice Shelf, and a previously inactive rift widened and propagated by similar to 3 km, similar to 25% of its previous length, setting the stage for the future calving of a similar to 14 km(2) iceberg. Within 24 h of these events, all remaining land-fast sea ice that had been stabilizing the ice shelf broke-up. The events were witnessed by time-lapse cameras at nearby Scott Base, and put into context using nearby seismic and automatic weather station data, satellite imagery and subsequent ground observation. Although the exact trigger of calving and rifting cannot be identified definitively, seismic records reveal superimposed sets of both long-period (>10 s) sea swell propagating into McMurdo Sound from storm sources beyond Antarctica, and high-energy, locally-sourced, short-period (