Rapid postglacial rebound amplifies global sea level rise following West Antarctic Ice Sheet collapse.
Rapid postglacial rebound amplifies global sea level rise following West Antarctic Ice Sheet collapse.
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DOI：
10.1126/sciadv.abf7787
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发表时间：
2021-04
期刊：
影响因子：
13.6
通讯作者：
Clark PU
中科院分区：
文献类型：
--
作者：
Pan L;Powell EM;Latychev K;Mitrovica JX;Creveling JR;Gomez N;Hoggard MJ;Clark PU
WAIS崩塌所暴露的海洋板块的快速抬升在过去放大了GMSL的上升，未来也会如此。大地测量学、地震学和地质学证据表明，南极洲西部的下面是低粘度的浅地幔。因此，随着西南极冰盖（WAIS）的海洋部分在过去的间冰期退缩，或将在未来退缩，暴露的基岩将迅速反弹，并将融水注入开阔的海洋。以前的研究表明，这对全球平均海平面（GMSL）上升的贡献很小，而且发生得很慢。我们挑战这一概念，海平面预测，结合外流机制和复杂的三维粘弹性地幔结构。在末次间冰期的情况下，WAIS崩塌对GMSL的贡献通常被认为是~3到4米，在崩塌后约1 000年内，外流机制对GMSL的额外变化贡献了~1米。使用未来WAIS崩溃的预测，我们还表明，外流可以大大放大GMSL上升估计在未来世纪。
Rapid uplift of marine sectors exposed by WAIS collapse amplified GMSL rise in the past and will do so in the future. Geodetic, seismic, and geological evidence indicates that West Antarctica is underlain by low-viscosity shallow mantle. Thus, as marine-based sectors of the West Antarctic Ice Sheet (WAIS) retreated during past interglacials, or will retreat in the future, exposed bedrock will rebound rapidly and flux meltwater out into the open ocean. Previous studies have suggested that this contribution to global mean sea level (GMSL) rise is small and occurs slowly. We challenge this notion using sea level predictions that incorporate both the outflux mechanism and complex three-dimensional viscoelastic mantle structure. In the case of the last interglacial, where the GMSL contribution from WAIS collapse is often cited as ~3 to 4 meters, the outflux mechanism contributes ~1 meter of additional GMSL change within ~1 thousand years of the collapse. Using a projection of future WAIS collapse, we also demonstrate that the outflux can substantially amplify GMSL rise estimates over the next century.
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