Strength and variability of the Oligocene Southern Ocean surface temperature gradient

Strength and variability of the Oligocene Southern Ocean surface temperature gradient
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渐新世南大洋表面温度梯度的强度和变化

DOI:
10.1038/s43247-022-00666-5
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发表时间:
2022
影响因子:
7.9
通讯作者:
Bijl, Peter K.
Bijl, Peter K.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Hoem, Frida S.;Sauermilch, Isabel;Aleksinski, Adam K.;Huber, Matthew;Peterse, Francien;Sangiorgi, Francesca;Bijl, Peter K.

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渐新世南极大冰盖与威尔克斯陆地附近温暖的近海共存。在这里,我们通过重建渐新世澳大利亚-南极纬度海面温度梯度的强度和变化性,提供了一个更广阔的南大洋视角来看待这种温暖。我们基于渐新世TEX86的南澳大利亚近海海表面温度记录显示,尽管构造向北漂移,但整个海温条件都是温和的(20-29 °C)。澳大利亚和南极洲之间存在持续的海表面温度梯度(~5-10 °C),这种梯度在冰期期间增加。由于南极-近地冷却,海面温度梯度从~26 Ma开始增加。同时,底栖有孔虫氧同位素的下降预示着冰的消失/深海变暖。仅靠温室气体排放很难解释这些截然不同的模式。海面温度冷却的时间与德雷克航道加深的时间一致,并与海洋模型实验的结果相吻合,这些结果表明德雷克航道的开放使南极近端水域降温。我们的结论是,德雷克航道加深使南极海岸变冷,从而加强了南极的热隔离。
Large Oligocene Antarctic ice sheets co-existed with warm proximal waters offshore Wilkes Land. Here we provide a broader Southern Ocean perspective to such warmth by reconstructing the strength and variability of the Oligocene Australian-Antarctic latitudinal sea surface temperature gradient. Our Oligocene TEX86-based sea surface temperature record from offshore southern Australia shows temperate (20–29 °C) conditions throughout, despite northward tectonic drift. A persistent sea surface temperature gradient (~5–10 °C) exists between Australia and Antarctica, which increases during glacial intervals. The sea surface temperature gradient increases from ~26 Ma, due to Antarctic-proximal cooling. Meanwhile, benthic foraminiferal oxygen isotope decline indicates ice loss/deep-sea warming. These contrasting patterns are difficult to explain by greenhouse gas forcing alone. Timing of the sea surface temperature cooling coincides with deepening of Drake Passage and matches results of ocean model experiments that demonstrate that Drake Passage opening cools Antarctic proximal waters. We conclude that Drake Passage deepening cooled Antarctic coasts which enhanced thermal isolation of Antarctica.
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