Large obliquity-paced Antarctic ice-volume fluctuations suggest melting by atmospheric and ocean warming during late Oligocene

Large obliquity-paced Antarctic ice-volume fluctuations suggest melting by atmospheric and ocean warming during late Oligocene
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南极冰量的大倾角波动表明渐新世晚期大气和海洋变暖导致冰量融化

DOI:
10.1038/s43247-023-00864-9
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发表时间:
2023
影响因子:
7.9
通讯作者:
Brzelinski S
Brzelinski S
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Brzelinski S

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晚渐新世(约27.8-23 My ago)提供了一个研究高CO2,比现在更温暖和单极(南极)冰川状态下过去气候变化的机会。在这里,我们提出了新的高分辨率地球化学记录保存完好的底栖有孔虫的晚渐新世,一个间隔,南极冰盖的大小和稳定性有争议。我们的记录表明,四个生命周期的冰川-间冰期循环与冰量的变化高达~70%的现代南极冰盖。晚渐新世冰期-间冰期旋回的冰量变化幅度与上新世晚期和更新世早期相当。间冰期的冰量估计值很小,足以容纳一个陆基南极冰盖,但对于研究的四个冰川中的三个,我们的计算意味着冰盖可能会超越南极海岸线到大陆架上。我们的研究结果表明,在渐新世晚期比现在温暖的气候条件下,南极冰盖容易受到自下而上(海洋)和自上而下(大气)变暖的影响而融化。
The late Oligocene (~27.8–23 My ago) offers an opportunity to study past climate variability under high-CO2, warmer-than-present and the unipolar (Antarctic) glaciated state. Here, we present new high-resolution geochemical records from exquisitely well-preserved benthic foraminifera for the late Oligocene, an interval for which Antarctic ice-sheet size and stability are debated. Our records indicate four obliquity-paced glacial-interglacial cycles with ice-volume changes of up to ~70% of the modern Antarctic ice-sheet. The amplitude of ice-volume change during these late Oligocene glacial-interglacial cycles is comparable to that of the late Pliocene and early Pleistocene. Ice-volume estimates for interglacials are small enough to be accommodated by a land-based Antarctic ice-sheet but, for three of the four glacials studied, our calculations imply that ice sheets likely advanced beyond the Antarctic coastline onto the shelves. Our findings suggest an Antarctic ice-sheet vulnerable to melting driven by both bottom-up (ocean) and top-down (atmospheric) warming under late Oligocene warmer-than-present climate conditions.
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