Actively surging West Antarctic ice streams and their response characteristics
Actively surging West Antarctic ice streams and their response characteristics
复制标题
南极西部冰流活跃涌动及其响应特征
DOI：
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发表时间：
1997
影响因子：
2.9
通讯作者：
R. Bindschadler
中科院分区：
文献类型：
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作者：
R. Bindschadler
南极洲西部的B、D和E冰流都显示出冰层厚度变化的纵向模式，这与为冰川建模的持续涌流行为一致。测量的模式与任何其他情景的模型响应不一致，例如累积速率变化或冰架上的变化。冰流开始向内陆迁移是这种行为模式的要求。如果目前正在发生这样的激增，那么西南极冰盖的剩余寿命是1200-6000年。假设了一个持续50000年-12000年的完整的涌动期，需要一个相对较短的涌动期(持续16000-21000年)来完全消除西南极冰盖的最大范围。应用经典的冰川响应理论表明，冰流响应的扩散分量比冰川快得多，这使得对冰流的运动波或局部响应的识别变得不可能。
Ice Streams B, D and E, West Antarctica, all show a longitudinal pattern of ice thickness change that is consistent with ongoing surge behavior modeled for glaciers. The measured pattern is not consistent with model response of any other scenario such as accumulation-rate change or changes on the ice shelf. Inland migration of the ice-stream onset is a requirement of this behavior pattern. If such a surge is presently taking place, the remaining lifetime of the West Antarctic ice sheet is 1200–6000 years. A complete surge period lasting 50 000–120 000 years is hypothesized, with a relatively brief surge phase (lasting 16000–21 000 years) required to completely remove the West Antarctic ice sheet from its maximum extent. Applying classic glacier response theory demonstrates that the diffusive component of response is much faster for ice streams than for glaciers, making the identification of either kinematic waves or localized responses on ice streams unlikely.