Ice surface lowering of Skelton Glacier, Transantarctic Mountains, since the Last Glacial Maximum: Implications for retreat of grounded ice in the western Ross Sea
Ice surface lowering of Skelton Glacier, Transantarctic Mountains, since the Last Glacial Maximum: Implications for retreat of grounded ice in the western Ross Sea
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自末次盛冰期以来跨南极山脉斯克尔顿冰川的冰面降低：对罗斯海西部接地冰消退的影响
DOI：
10.1016/j.quascirev.2020.106305
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发表时间：
2020
影响因子：
4
通讯作者：
T. Fujioka
中科院分区：
文献类型：
--
作者：
Jacob T. H. Anderson;G. Wilson;R. S. Jones;D. Fink;T. Fujioka
量化东南极冰盖（EAIS）在最后一次冰消期海平面上升的贡献是复杂的限制冰盖模型的机会有限。冰原岛峰，Escalade峰，提供了一个衡量过去的冰面海拔变化和整个末次冰期周期的行为。地貌制图、地质证据和Escalade峰的10Be宇宙成因核素暴露测年，为自末次盛冰期（LGM）以来的南极雪顿河冰面历史提供了新的限制。Escalade峰东缘的海拔剖面表明，LGM期间，Escalton Névé的冰面至少比现在高出50米，可能超过120米。相比之下，表面暴露年龄从一套内冰碛（蓝冰冰碛）相邻的Escalade峰不提供独立的冰面高程的限制，但可能会提供一个间接的约束时间变薄，由于挖除消融过程。内冰碛的最大简单暴露年龄表明，冰面消融开始于19.2 ka，但Escalade峰的大部分冰面下降可能发生在19.15 ka之后，并在19.6 ka达到现今的冰位。这些研究结果表明，缓慢流动的内陆网站EAIS出口冰川，如南部Névé，经历了最小的冰面高程变化，因为LGM和记录EAIS出口冰川和西部罗斯海撤退签名，而不是广泛的罗斯海撤退。冰面下降很可能是由于罗斯湾西部的地面冰退缩，导致罗斯顿冰川的支撑作用减少，并被拉入罗斯海。
Quantifying the contribution of the East Antarctic Ice Sheet (EAIS) to sea-level rise during the last deglaciation is complicated by the limited opportunities to constrain ice-sheet models. The nunatak, Escalade Peak, provides a gauge for past ice surface elevation changes and behaviour throughout the last glacial cycle. Geomorphological mapping, geological evidence and10Be cosmogenic-nuclide exposure dating at Escalade Peak, provide new constraints on the ice surface history of the Skelton Névé since the Last Glacial Maximum (LGM). An elevation transect from the eastern margin of Escalade Peak indicates that the ice surface of the Skelton Névé was at least 50 m and perhaps >120 m higher than present during the LGM. In contrast, surface-exposure ages from a suite of inner moraines (blue-ice moraines) adjacent to Escalade Peak do not provide independent ice surface elevation constraints, but may provide an indirect constraint on the timing of thinning due to exhumation-ablation processes. Maximum simple exposure ages from the inner moraines suggest ice surface ablation was initiated by 19.2 ka, but the majority of ice surface lowering at Escalade Peak likely occurred after ∼15 ka and reached the present-day ice level at ∼6 ka. These findings suggest that slow flowing inland sites of EAIS outlet glaciers, such as southern Skelton Névé, experienced minimal ice surface elevation change since the LGM and record an EAIS outlet glacier and western Ross Sea retreat signature rather than widespread Ross Sea retreat. The ice surface lowering is likely to have been in response to retreat of the grounded ice in the western Ross Embayment causing a reduction in buttressing of the Skelton Glacier and draw down into the Ross Sea.
麦克默多海峡（南极洲）罗斯海流的来源及其对中第四纪到末次盛冰期冰川迁移的影响：来自岩相数据的新证据
影响因子：
2.8
作者：
Perotti, Matteo;Zurli, Luca;Sandroni, Sonia;Cornamusini, Gianluca;Talarico, Franco
通讯作者：
Talarico, Franco
DOI：
10.1016/j.palaeo.2011.01.027
发表时间：
2012-06
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
C. Fogwill;A. Hein;M. J. Bentley;D. Sugden
通讯作者：
C. Fogwill;A. Hein;M. J. Bentley;D. Sugden
DOI：
10.5194/esurf-4-515-2016
发表时间：
2015-11
期刊：
--
影响因子：
--
作者：
M. Westoby;S. Dunning;J. Woodward;A. Hein;S. Marrero;Kate Winter;D. Sugden
通讯作者：
M. Westoby;S. Dunning;J. Woodward;A. Hein;S. Marrero;Kate Winter;D. Sugden