Polar Frontal Migration in the Warm Late Pliocene: Diatom Evidence From the Wilkes Land Margin, East Antarctica
Polar Frontal Migration in the Warm Late Pliocene: Diatom Evidence From the Wilkes Land Margin, East Antarctica
复制标题
温暖的上新世晚期的极锋迁移：来自东南极洲威尔克斯陆缘的硅藻证据
DOI：
10.1002/2017pa003225
复制
发表时间：
2018
影响因子：
3.5
通讯作者：
C. Riesselman
中科院分区：
文献类型：
--
作者：
B. Taylor;C. Riesselman
上新世晚期是地球历史上将全球气温维持在预测的21世纪变暖范围内的最近一段时间，为我们在即将到来的世纪可能遇到的变化提供了一个有吸引力的类比。已发表的全球重建和气候模型发现，在上新世晚期3.3-3.0 Ma期间，大气CO2浓度最后达到400 ppm时，夏季平均海面温度相对于现代有+2°的异常。在这里，我们提出了一个新的硅藻为基础的重建上新世间冰期海面条件从IODP网站U1361，在东南极大陆隆起。我们发现，开放的海洋条件在上新世中期变得越来越多的海冰从3.6-3.2马，在北方冰川作用的开始。这种冷却趋势被南极极锋的暂时向南迁移所打断，在单一的间冰期-海洋同位素阶段KM 3（3.17-3.15 Ma）期间，U1361沐浴在亚南极沃茨中，之后海冰又回来了。在此基础上，我们重新审视了早期的重建，以探索南大洋/冰冻圈系统对上新世晚期温暖峰值的响应。通过将现代年代地层框架应用于这些低分辨率重建，我们在南大洋太平洋部分的其他四个岩心中确定了相同的锋面迁移，记录了温暖气候关键间隔期间极锋的主要迁移。这些新的结果表明，Km 3是在人为变暖的背景下测试冰盖稳定性的关键间隔。
The late Pliocene is the most recent interval in Earth's history to sustain global temperatures within the range of warming predicted for the 21st century, providing an appealing analog for the changes we might encounter in the coming century. Published global reconstructions and climate models find an average +2° summer sea surface temperature anomaly relative to modern during the 3.3–3.0 Ma interval of the late Pliocene, when atmospheric CO2 concentrations last reached 400 ppm. Here we present a new diatom‐based reconstruction of Pliocene interglacial sea surface conditions from IODP Site U1361, on the East Antarctic continental rise. We find that open ocean conditions in the mid‐Pliocene became increasingly influenced by sea ice from 3.6–3.2 Ma, prior to the onset of Northern Hemisphere glaciation. This cooling trend was interrupted by a temporary southward migration of the Antarctic Polar Front, bathing U1361 in subantarctic waters during a single interglacial—marine isotope stage KM3 (3.17–3.15 Ma)—after which sea ice returned. Building on the identification of this single outlier interglacial, we have revisited earlier reconstructions to explore the response of the Southern Ocean/cryosphere system to peak late Pliocene warmth. By applying a modern chronostratigraphic framework to those low‐resolution reconstructions, we identify the same frontal migration in four other cores in the Pacific sector of the Southern Ocean, documenting a major migration of the polar front during a key interval of warm climate. These new results suggest that KM3 is a crucial interval to test ice sheet stability in the context of anthropogenic warming.
登录
查看更多内容
影响因子：
18.3
作者：
Greenbaum, J. S.;Blankenship, D. D.;Siegert, M. J.
通讯作者：
Siegert, M. J.
影响因子：
--
作者：
L. Tauxe;C. Stickley;S. Sugisaki;P. Bijl;S. Bohaty;H. Brinkhuis;C. Escutia;J. Flores;A. Houben;M. Iwai;F. Jiménez-Espejo;R. McKay;S. Passchier;J. Pross;C. Riesselman;U. Röhl;F. Sangiorgi;K. Welsh;A. Klaus;Annick Fehr;J. Bendle;R. Dunbar;J. Gonzàlez;T. Hayden;K. Katsuki;M. Olney;S. Pekar;P. Shrivastava;T. Flierdt;T. Williams;M. Yamane
通讯作者：
L. Tauxe;C. Stickley;S. Sugisaki;P. Bijl;S. Bohaty;H. Brinkhuis;C. Escutia;J. Flores;A. Houben;M. Iwai;F. Jiménez-Espejo;R. McKay;S. Passchier;J. Pross;C. Riesselman;U. Röhl;F. Sangiorgi;K. Welsh;A. Klaus;Annick Fehr;J. Bendle;R. Dunbar;J. Gonzàlez;T. Hayden;K. Katsuki;M. Olney;S. Pekar;P. Shrivastava;T. Flierdt;T. Williams;M. Yamane
影响因子：
5.3
作者：
Lunt, Daniel J.;Haywood, Alan M.;Loptson, Claire A.
通讯作者：
Loptson, Claire A.
DOI：
10.1098/rsta.2010.0317
发表时间：
2011-03-13
影响因子：
5
作者：
Haywood, Alan M.;Ridgwell, Andy;Williams, Mark
通讯作者：
Williams, Mark