Bedrock Erosion Surfaces Record Former East Antarctic Ice Sheet Extent

Bedrock Erosion Surfaces Record Former East Antarctic Ice Sheet Extent
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基岩侵蚀表面创下前南极东部冰盖范围

DOI:
10.1029/2018gl077268
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发表时间:
2018
影响因子:
5.2
通讯作者:
DeConto, Robert M.
DeConto, Robert M.
中科院分区:
地球科学1区
文献类型:
--
作者:
Paxman, Guy J.;Jamieson, Stewart S.;Ferraccioli, Fausto;Bentley, Michael J.;Ross, Neil;Armadillo, Egidio;Gasson, Edward G.;Leitchenkov, German;DeConto, Robert M.

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东南极洲拥有巨大的冰下盆地,东南极洲冰盖(EAIS)可能在过去温暖的气候中退缩到这些盆地中。然而,退缩的程度仍然缺乏限制,这使得量化这些海洋盆地过去和预测未来对全球海平面上升的贡献具有挑战性。利用地形地貌分析和冰川下盆地的弯曲模拟,重建了渐新世—中新世暖期的冰缘。平坦的基岩高原表明,在渐新世-中新世的较长时期内,位于现代接地带内陆400-500公里处的冰盖边缘,相当于全球海平面上升了2米。我们的研究结果表明,如果未来发生大的东亚寒带退缩,均衡反弹将使高原表面成为大范围冰上升的播种点,从而限制了早期东亚寒带大规模的冰缘退缩。
East Antarctica hosts large subglacial basins into which the East Antarctic Ice Sheet (EAIS) likely retreated during past warmer climates. However, the extent of retreat remains poorly constrained, making quantifying past and predicted future contributions to global sea level rise from these marine basins challenging. Geomorphological analysis and flexural modeling within the Wilkes Subglacial Basin are used to reconstruct the ice margin during warm intervals of the Oligocene‐Miocene. Flat‐lying bedrock plateaus are indicative of an ice sheet margin positioned >400–500 km inland of the modern grounding zone for extended periods of the Oligocene‐Miocene, equivalent to a 2‐m rise in global sea level. Our findings imply that if major EAIS retreat occurs in the future, isostatic rebound will enable the plateau surfaces to act as seeding points for extensive ice rises, thus limiting extensive ice margin retreat of the scale seen during the early EAIS.
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