Observed rapid bedrock uplift in Amundsen Sea Embayment promotes ice-sheet stability
Observed rapid bedrock uplift in Amundsen Sea Embayment promotes ice-sheet stability
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DOI：
10.1126/science.aao1447
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发表时间：
2018-06-22
期刊：
影响因子：
56.9
通讯作者：
Wiens, Douglas A.
中科院分区：
文献类型：
--
作者：
Barletta, Valentina R.;Bevis, Michael;Wiens, Douglas A.
位于阿蒙森海湾（ASE）的西南极冰盖（WAIS）的海洋部分占全球海平面上升的冰冻圈贡献的四分之一，并且容易发生灾难性的崩溃。基岩对冰量损失的反应，即冰川均衡调整（GIA），被认为发生在10，000年的时间尺度上。我们使用了新的GPS测量，显示了ASE的快速（每年41毫米）上升，以估计下面地幔的粘度。我们发现了比全球平均值低得多的粘度（4 × 10（18）帕斯卡-秒），这将GIA的响应时间从数十年缩短到数百年。我们的研究结果需要向上修正冰质量损失的重力数据的10%，并增加了潜在的稳定性的WAIS对灾难性的崩溃。
The marine portion of the West Antarctic Ice Sheet (WAIS) in the Amundsen Sea Embayment (ASE) accounts for one-fourth of the cryospheric contribution to global sea-level rise and is vulnerable to catastrophic collapse. The bedrock response to ice mass loss, glacial isostatic adjustment (GIA), was thought to occur on a time scale of 10,000 years. We used new GPS measurements, which show a rapid (41 millimeters per year) uplift of the ASE, to estimate the viscosity of themantle underneath. We found amuch lower viscosity (4 x 10(18) pascal-second) than global average, and this shortens the GIA response time scale from tens to hundreds of years. Our finding requires an upward revision of ice mass loss from gravity data of 10% and increases the potential stability of the WAIS against catastrophic collapse.