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
中科院分区:
文献类型:
--
作者:
Brzelinski S
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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影响因子:
3.5
作者:
A. Troedson;J. Smellie
通讯作者:
J. Smellie
影响因子:
5.3
作者:
A. Tripati;R. Eagle;A. Morton;J. Dowdeswell;Katie L. Atkinson;Y. Bahé;C. Dawber;E. Khadun;Ruth M.H. Shaw;O. Shorttle;L. Thanabalasundaram
通讯作者:
A. Tripati;R. Eagle;A. Morton;J. Dowdeswell;Katie L. Atkinson;Y. Bahé;C. Dawber;E. Khadun;Ruth M.H. Shaw;O. Shorttle;L. Thanabalasundaram
影响因子:
1.1
作者:
M. Petrizzo;Greta Leoni;R. Speijer;B. D. Bernardi;F. Felletti
通讯作者:
F. Felletti
DOI:
10.1073/pnas.2004209117
发表时间:
2020
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
作者:
Wilson;Fiebig;Repschläger;Friedrich
通讯作者:
Friedrich
影响因子:
64.8
作者:
Naish, T.;Powell, R.;Williams, T.
通讯作者:
Williams, T.