Evidence for a Highly Dynamic West Antarctic Ice Sheet During the Pliocene

Evidence for a Highly Dynamic West Antarctic Ice Sheet During the Pliocene
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上新世期间南极西部冰盖高度动态的证据

DOI:
10.1029/2021gl093103
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发表时间:
2021
影响因子:
5.2
通讯作者:
Gohl K
Gohl K
中科院分区:
地球科学1区
文献类型:
--
作者:
Gohl K

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据推测,在过去的温暖时期(如上新世),南极西部冰原(WAIS)阿蒙森海部分的主要冰损失引发了冰原的崩塌。国际海洋发现计划(IODP)的379号探险队从大陆隆起的沉积物漂流中恢复了晚中新世到全新世的连续沉积物,从而可以评估晚中新世以来气候周期和趋势的沉积过程。通过与陆架的地震对比,我们解释了在上新世期间,通过频繁的地面冰的推进,将外陆架延伸了80公里的大规模进动序列。埋藏的接地带楔形表明,在从远征379记录推断的4.2-3.2 Ma的延长的上新世中期暖期期间,冰盖退缩甚至崩溃的时间延长了。这些结果表明,上新世期间,西海构造具有高度的动力,阿蒙森海边缘可能发生了重大的退缩事件。
Major ice loss in the Amundsen Sea sector of the West Antarctic Ice Sheet (WAIS) is hypothesized to have triggered ice sheet collapses during past warm periods such as those in the Pliocene. International Ocean Discovery Program (IODP) Expedition 379 recovered continuous late Miocene to Holocene sediments from a sediment drift on the continental rise, allowing assessment of sedimentation processes in response to climate cycles and trends since the late Miocene. Via seismic correlation to the shelf, we interpret massive prograding sequences that extended the outer shelf by 80 km during the Pliocene through frequent advances of grounded ice. Buried grounding zone wedges indicate prolonged periods of ice‐sheet retreat, or even collapse, during an extended mid‐Pliocene warm period from ∼4.2–3.2 Ma inferred from Expedition 379 records. These results indicate that the WAIS was highly dynamic during the Pliocene and major retreat events may have occurred along the Amundsen Sea margin.
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