Glacial retreat in the Amundsen Sea sector, West Antarctica – first cosmogenic evidence from central Pine Island Bay and the Kohler Range
Glacial retreat in the Amundsen Sea sector, West Antarctica – first cosmogenic evidence from central Pine Island Bay and the Kohler Range
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西南极洲阿蒙森海区的冰川退缩——来自松岛湾中部和科勒山脉的第一个宇宙成因证据
DOI：
10.1016/j.quascirev.2014.05.010
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发表时间：
2014
影响因子：
4
通讯作者：
Spiegel
中科院分区：
文献类型：
--
作者：
Lindow;Castex;Wittmann;Johnson;Lisker;Spiegel
南极洲西部的阿蒙森海湾是南极洲西部冰盖变化最快的地区之一。松岛湾周围地区拥有南极洲流动最快的冰流，其特点是冰盖迅速变薄，地面线迅速后退。已发表的地表暴露数据仅限于少数孤立的冰原岛峰，因此难以评估该地区的长期冰川消退历史。为了解决这个问题，我们将现有的记录横向冰流撤退海洋沉积物芯与陆上冰川变薄东部玛丽伯德土地的两个关键领域：科勒范围和松岛湾。我们的10 Be表面暴露年龄是第一次从孤立的科勒范围，并表明，冰原岛峰有8.6和12.6万年之间成为无冰。这意味着最低长期平均变薄率为3.3 ± 0.3厘米/年，比根据卫星数据得出的近期变薄率低一个数量级。我们还提出了前到早期全新世10 Be表面暴露年龄从两个岛屿位于下游约80公里的松岛冰川冰架前约束的横向冰消历史在松岛湾地区。这项研究提供了深入了解当地的冰盖变化的意义，并表明，在阿蒙森海部门的末次冰期后的历史的特点是冰川变薄，以及在前至全新世早期的侧向退缩。
The Amundsen Sea Embayment of West Antarctica hosts one of the most rapidly changing sectors of the West Antarctic Ice Sheet. With the fastest-flowing ice streams in Antarctica, the region around Pine Island Bay is characterized by rapid ice-sheet thinning and grounding-line retreat. Published surface-exposure data are limited to a few isolated nunataks making it difficult to assess the long-term deglacial history of the area. To address this, we correlate existing records of lateral ice-stream retreat from marine sediment cores with onshore glacial thinning in two key areas of eastern Marie Byrd Land: the Kohler Range and Pine Island Bay. Our10Be surface-exposure ages are the first from the isolated Kohler Range and show that the nunataks there became ice-free between 8.6 and 12.6 ka. This implies a minimum long-term average thinning rate of 3.3 ± 0.3 cm/yr, which is one order of magnitude lower than recent rates based on satellite data. We also present pre- to early Holocene10Be surface-exposure ages from two islands located approximately 80 km downstream of the Pine Island Glacier ice-shelf front to constrain the lateral deglacial history in the Pine Island Bay area. This study provides insight into the significance of local ice sheet variations and suggests that the post-LGM history in the Amundsen Sea sector was characterized by glacial thinning as well as lateral retreat in pre- to early Holocene times.
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南极洲Reedy冰川晚第四纪演化
影响因子：
4
作者：
Claire Todd;J. Stone;H. Conway;B. Hall;G. Bromley
通讯作者：
G. Bromley
冰川地质学：冰盖和地貌
DOI：
--
发表时间：
1997
期刊：
影响因子：
--
作者：
N. Iverson
通讯作者：
N. Iverson
影响因子：
30.7
作者：
Favier, L.;Durand, G.;Le Brocq, A. M.
通讯作者：
Le Brocq, A. M.
影响因子：
18.3
作者：
Rignot, Eric;Bamber, Jonathan L.;Van Meijgaard, Erik
通讯作者：
Van Meijgaard, Erik
影响因子：
56.9
作者：
J. Stone;G. Balco;D. Sugden;M. Caffee;L. Sass;Seth G. Cowdery;C. Siddoway
通讯作者：
J. Stone;G. Balco;D. Sugden;M. Caffee;L. Sass;Seth G. Cowdery;C. Siddoway