Ice-shelf retreat drives recent Pine Island Glacier speedup.

Ice-shelf retreat drives recent Pine Island Glacier speedup.
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DOI:
10.1126/sciadv.abg3080
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发表时间:
2021-06
期刊:
影响因子:
13.6
通讯作者:
Barham M
Barham M
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Joughin I;Shapero D;Smith B;Dutrieux P;Barham M

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南极洲对海平面的最大贡献者随着其浮冰架的主要部分坍塌而进一步加速。过去几十年来,松岛冰川的加速发展使其成为南极洲海平面上升的最大贡献者。过去的加速很大程度上是由于接地线撤退,以应对海洋引起的变薄,减少冰架支撑。虽然从2009年到2017年底,速度保持相当稳定,但我们的哥白尼哨兵1A/B导出的速度数据显示,在过去3年中,速度增加了12%以上,与冰架后退19公里相吻合。我们使用冰流模型来模拟这种损失,发现加速产犊可以解释最近的加速,独立的接地线,融化驱动的过程负责过去的加速。如果冰架的快速退缩继续下去,它可能会进一步破坏冰川的稳定性,其速度远远快于由于表面或海洋融化过程而预期的速度。
Antarctica’s largest contributor to sea level has sped up further as a major section of its floating ice shelf collapsed. Speedup of Pine Island Glacier over the past several decades has made it Antarctica’s largest contributor to sea-level rise. The past speedup is largely due to grounding-line retreat in response to ocean-induced thinning that reduced ice-shelf buttressing. While speeds remained fairly steady from 2009 to late 2017, our Copernicus Sentinel 1A/B–derived velocity data show a >12% speedup over the past 3 years, coincident with a 19-km retreat of the ice shelf. We use an ice-flow model to simulate this loss, finding that accelerated calving can explain the recent speedup, independent of the grounding-line, melt-driven processes responsible for past speedups. If the ice shelf’s rapid retreat continues, it could further destabilize the glacier far sooner than would be expected due to surface- or ocean-melting processes.
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