Submarine landforms reveal varying rates and styles of deglaciation in North-West Greenland fjords
Submarine landforms reveal varying rates and styles of deglaciation in North-West Greenland fjords
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海底地貌揭示了格陵兰岛西北部峡湾不同的冰川消融速度和类型
DOI：
10.1016/j.margeo.2017.08.003
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发表时间：
2018
期刊：
影响因子：
2.9
通讯作者：
Batchelor C
中科院分区：
文献类型：
--
作者：
Batchelor C
需要了解格陵兰冰盖以前的结构和动态，以便为现代观测提供背景，限制数值模型，并预测冰盖未来可能对气候变化的反应。而以前的地球物理调查西北格陵兰边缘的重点是完整的冰川和冰消地貌的绘图中到外架，相对较少的是知道最近的冰盖动态内架和峡湾。我们目前的条带测深数据从内大陆架和峡湾西北格陵兰岛。流线型的冰下地貌，包括冰雕基岩和大型冰川线理，揭示了晚第四纪冰流通过峡湾和内部大陆架的方向。地形是横向于前冰流的方向，包括小退缩冰碛，主要冰碛脊和接地区楔，显示前仍然站在接地区的位置在区域冰川消退和终端readvances连接到小冰期。海底冰川地貌在峡湾内部的分布表明，西北格陵兰岛的出口冰川经历了不同的速度和风格的冰退缩在晚全新世，这可能主要是由峡湾水深控制。当代水深< 350米的内峡湾包含一系列小的后退冰碛，这表明接地冰缘的缓慢后退。水深> 350 m的峡湾内通常不存在小型退缩冰碛，这被解释为在全新世晚期经历了更快速的冰退缩。
An understanding of the former configuration and dynamics of the Greenland Ice Sheet is needed to provide a context for modern observations, to constrain numerical models and to predict the likely future ice-sheet response to climatic change. Whereas previous geophysical investigations of the North-West Greenland margin have focused on the mapping of full-glacial and deglacial landforms on the mid to outer shelf, relatively little is known about more recent ice-sheet dynamics on the inner shelf and in the fjords. We present swath-bathymetric data from the inner shelf and fjords of North-West Greenland. Streamlined subglacial landforms, including ice-sculpted bedrock and mega-scale glacial lineations, reveal the direction of Late Quaternary ice flow through fjords and across the inner shelf. Landforms that are transverse to the former ice-flow direction, including small recessional moraines, major moraine ridges and grounding-zone wedges, show the locations of former still-stands in the grounding zone during regional deglaciation and terminus readvances linked to the Little Ice Age. The distribution of submarine glacial landforms in the inner fjords suggests that the outlet glaciers of North-West Greenland experienced varying rates and styles of ice retreat during the late Holocene, which was probably controlled mainly by fjord water depth. Inner fjords that have contemporary water depths of < 350 m contain series of small recessional moraines, which indicate the slow retreat of a grounded ice margin. Small recessional moraines are generally absent from inner fjords with water depths of > 350 m, which are interpreted to have experienced more rapid ice retreat during the late Holocene.
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影响因子：
2.3
作者：
Bennike, O;Björck, S
通讯作者：
Björck, S
影响因子：
--
作者：
G. Oakey;J. Chalmers
通讯作者：
G. Oakey;J. Chalmers
DOI：
--
发表时间：
2000
期刊：
影响因子：
--
作者：
M. Canals;R. Urgeles;A. Calafat
通讯作者：
A. Calafat
影响因子：
4
作者：
Arndt, Jan Erik;Jokat, Wilfried;Dorschel, Boris
通讯作者：
Dorschel, Boris
格陵兰西北部梅尔维尔湾变质基岩地形近海和陆上冰川形成特征的高分辨率测绘
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
F. Freire;R. Gyllencreutz;S. Greenwood;L. Mayer;Arnar Egilsson;T. Thorsteinsson;M. Jakobsson
通讯作者：
M. Jakobsson