Interhemispheric Ice-Sheet Synchronicity During the Last Glacial Maximum
Interhemispheric Ice-Sheet Synchronicity During the Last Glacial Maximum
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DOI：
10.1126/science.1209299
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发表时间：
2011-12
期刊：
影响因子：
56.9
通讯作者：
M. Weber;P. Clark;W. Ricken;J. Mitrovica;S. Hostetler;G. Kuhn
中科院分区：
文献类型：
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作者：
M. Weber;P. Clark;W. Ricken;J. Mitrovica;S. Hostetler;G. Kuhn
东南极冰盖的一部分与北方冰盖同步进退。相对于北方半球冰盖，南极冰盖最后最大范围的时间仍然知之甚少。我们开发的威德尔海部门的东南极冰盖的年表，结合其他南极冰盖部门的年龄，表明前进和撤退的最大程度的日期内的不确定性同步与北方冰盖的大部分部门。南极物质平衡的表面气候强迫可能会导致相反的反应，即气候变暖会增加积累，但不会增加表面融化。我们的新数据支持遥相关，包括来自北方冰盖的海平面强迫，北大西洋深水形成的变化，以及伴随南极接地线的热通量，以同步半球冰盖。
Part of the East Antarctic Ice Sheet advanced and retreated in synchrony with Northern Hemispheric ice sheets. The timing of the last maximum extent of the Antarctic ice sheets relative to those in the Northern Hemisphere remains poorly understood. We develop a chronology for the Weddell Sea sector of the East Antarctic Ice Sheet that, combined with ages from other Antarctic ice-sheet sectors, indicates that the advance to and retreat from their maximum extent was within dating uncertainties synchronous with most sectors of Northern Hemisphere ice sheets. Surface climate forcing of Antarctic mass balance would probably cause an opposite response, whereby a warming climate would increase accumulation but not surface melting. Our new data support teleconnections involving sea-level forcing from Northern Hemisphere ice sheets and changes in North Atlantic deep-water formation and attendant heat flux to Antarctic grounding lines to synchronize the hemispheric ice sheets.