Southern Ocean warming and Wilkes Land ice sheet retreat during the mid-Miocene.
Southern Ocean warming and Wilkes Land ice sheet retreat during the mid-Miocene.
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中新世中期，南大洋变暖和威尔克斯在冰盖上撤退。
DOI：
10.1038/s41467-017-02609-7
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发表时间：
2018-01-22
影响因子：
16.6
通讯作者：
Brinkhuis H
中科院分区：
文献类型：
--
作者：
Sangiorgi F;Bijl PK;Passchier S;Salzmann U;Schouten S;McKay R;Cody RD;Pross J;van de Flierdt T;Bohaty SM;Levy R;Williams T;Escutia C;Brinkhuis H
观测和模式实验强调了海洋热在现在和过去地质时期迫使冰盖退缩中的重要性，但过去的海洋温度数据在冰盖近端位置几乎缺失。在这里，我们通过研究adsamlie海岸的沉积物岩心，记录了中新世中期（~17 - 1340万年前）Wilkes Land冰下盆地（东南极洲）的古海洋条件和稳定性。冰盖的内陆退缩、温带植被和温暖的少营养水域是中新世中期气候最佳（MCO; 17-14.8 Ma）的特征。在MCO之后，以海洋为基础的冰盖发生扩张，但在偶发性暖水入侵时对融化仍然敏感。我们的研究结果表明，中新世中期横跨南大洋的纬度温度梯度从未像现在这样。研究表明，海洋气候与南极大陆条件存在强烈的耦合，南极东部冰下盆地对海洋变暖高度敏感。海洋热量在迫使冰盖退缩方面是重要的，但过去来自近端冰盖位置的海洋温度数据很少。在这里，作者提出了中新世中期Wilkes Land冰下盆地的温度重建，并表明温暖的海水使冰盖退缩了17-14.8 Ma。
Observations and model experiments highlight the importance of ocean heat in forcing ice sheet retreat during the present and geological past, but past ocean temperature data are virtually missing in ice sheet proximal locations. Here we document paleoceanographic conditions and the (in)stability of the Wilkes Land subglacial basin (East Antarctica) during the mid-Miocene (~17–13.4 million years ago) by studying sediment cores from offshore Adélie Coast. Inland retreat of the ice sheet, temperate vegetation, and warm oligotrophic waters characterise the mid-Miocene Climatic Optimum (MCO; 17–14.8 Ma). After the MCO, expansion of a marine-based ice sheet occurs, but remains sensitive to melting upon episodic warm water incursions. Our results suggest that the mid-Miocene latitudinal temperature gradient across the Southern Ocean never resembled that of the present day. We demonstrate that a strong coupling of oceanic climate and Antarctic continental conditions existed and that the East Antarctic subglacial basins were highly sensitive to ocean warming. Ocean heat is important in forcing ice sheet retreat, yet past ocean temperature data from proximal ice sheet locations are sparse. Here, the authors present temperature reconstructions from the Wilkes Land subglacial basin during the mid-Miocene, and show that warm waters sustained ice sheet retreat 17–14.8 Ma.
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DOI：
10.1016/0031-0182(94)90251-8
发表时间：
1994-04-01
影响因子：
3
作者：
FLOWER, BP;KENNETT, JP
通讯作者：
KENNETT, JP
影响因子：
1.9
作者：
Bonnet, Sophie;de Vernal, Anne;Husum, Katrine
通讯作者：
Husum, Katrine
影响因子：
5.3
作者：
Hopmans, EC;Weijers, JWH;Schouten, S
通讯作者：
Schouten, S
影响因子：
4.9
作者：
Herold, N.;Huber, M.;Mueller, R. D.
通讯作者：
Mueller, R. D.
影响因子：
5.2
作者：
Hill, Daniel J.;Haywood, Alan M.;Bowman, Vanessa C.
通讯作者：
Bowman, Vanessa C.