Deglacial history of the Pensacola Mountains, Antarctica from glacial geomorphology and cosmogenic nuclide surface exposure dating
Deglacial history of the Pensacola Mountains, Antarctica from glacial geomorphology and cosmogenic nuclide surface exposure dating
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从冰川地貌和宇宙成因核素表面暴露测年来看南极洲彭萨科拉山脉的冰消历史
DOI：
10.1016/j.quascirev.2016.09.028
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发表时间：
2017
影响因子：
4
通讯作者：
Bentley M
中科院分区：
文献类型：
--
作者：
Bentley M
南极冰盖的退缩历史对于理解快速冰川消退，以及约束冰川均衡调整建模所需的数值冰盖模型和冰负荷模型是重要的。关于末次冰盛期威德尔海海湾的冰积程度及其随后的冰消历史，存在着特别的争论。在这里，我们提供了一个新的数据集的地貌观测和宇宙成因的核素表面暴露年龄的不稳定的样品，限制冰消历史的彭萨科拉山脉，毗邻今天的基金会冰流和学院冰川南部威德尔海海湾。我们发现至少有两个冰川的证据，其中第一个是相对古老和温暖的基础上，和最近的冷基础的冰川。在最近的冰川期，威廉姆斯山的冰层至少增厚了450米，布拉格山的冰层至少增厚了380米。逐步变薄，从这些网站正在进行的10万年BP和冰达到目前的水平，2.5万年BP，大致类似于相对温和的变薄的历史，在南部埃尔斯沃思山脉。变薄的历史是一致的，但并不强制要求，晚全新世撤退的接地线比现在的配置更小，最近已经假设的基础上冰盖和冰川均衡模型。数据还表明，具有复杂暴露历史的碎屑是普遍存在的，碎屑回收是高度依赖于网站。这些新的数据提供了限制重建的后退历史的前扩大基金会冰流，来自使用数值流带模型。
The retreat history of the Antarctic Ice Sheet is important for understanding rapid deglaciation, as well as to constrain numerical ice sheet models and ice loading models required for glacial isostatic adjustment modelling. There is particular debate about the extent of grounded ice in the Weddell Sea embayment at the Last Glacial Maximum, and its subsequent deglacial history. Here we provide a new dataset of geomorphological observations and cosmogenic nuclide surface exposure ages of erratic samples that constrain the deglacial history of the Pensacola Mountains, adjacent to the present day Foundation Ice Stream and Academy Glacier in the southern Weddell Sea embayment. We show there is evidence of at least two glaciations, the first of which was relatively old and warm-based, and a more recent cold-based glaciation. During the most recent glaciation ice thickened by at least 450 m in the Williams Hills and at least 380 m on Mt Bragg. Progressive thinning from these sites was well underway by 10 ka BP and ice reached present levels by 2.5 ka BP, and is broadly similar to the relatively modest thinning histories in the southern Ellsworth Mountains. The thinning history is consistent with, but does not mandate, a Late Holocene retreat of the grounding line to a smaller-than-present configuration, as has been recently hypothesized based on ice sheet and glacial isostatic modelling. The data also show that clasts with complex exposure histories are pervasive and that clast recycling is highly site-dependent. These new data provide constraints on a reconstruction of the retreat history of the formerly-expanded Foundation Ice Stream, derived using a numerical flowband model.
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DOI：
--
发表时间：
2002
期刊：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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K. Matsuoka;R. Hindmarsh;G. Moholdt;M. J. Bentley;H. Pritchard;Joel Brown;H. Conway;R. Drews;G. Durand;D. Goldberg;T. Hattermann;J. Kingslake;J. Lenaerts;C. Martín;R. Mulvaney;K. Nicholls;F. Pattyn;N. Ross;T. Scambos;P. Whitehouse
DOI：
--
发表时间：
2014
期刊：
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作者：
Y. Suganuma;H. Miura;Zondervan Albert;J. Okuno
通讯作者：
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