Submarine Moraines in Southeast Greenland Fjords Reveal Contrasting Outlet-Glacier Behavior since the Last Glacial Maximum
Submarine Moraines in Southeast Greenland Fjords Reveal Contrasting Outlet-Glacier Behavior since the Last Glacial Maximum
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DOI：
10.1029/2019gl082556
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发表时间：
2019-03-28
影响因子：
5.2
通讯作者：
Millan, R.
中科院分区：
文献类型：
--
作者：
Batchelor, C. L.;Dowdeswell, J. A.;Millan, R.
了解格陵兰东南部出口冰川的过去行为对于理解和模拟格陵兰冰盖（GIS）对气候变化响应的空间差异是必要的。在这里，我们使用水深数据绘制了格陵兰岛东南部峡湾50多个主要冰碛的分布图。峡湾内的冰碛沿格陵兰岛东南部边缘分布广泛，65%的调查峡湾都有冰碛。我们首次发现了9个横跨Julianehab冰帽东部边缘约150公里长的中湾冰碛。相比之下，SE GIS中较深和较宽的峡湾通常没有中湾冰碛。格陵兰岛东南缘峡湾中部冰碛的变化分布揭示了末次冰消期东南GIS与东部朱利安内哈冰帽的差异，这可能反映了峡湾几何形状和海洋热暴露的差异。
Knowledge of the past behavior of the outlet glaciers of Southeast (SE) Greenland is necessary to understand and model spatial differences in the response of the Greenland Ice Sheet (GIS) to climatic changes. Here we use bathymetric data to map the distribution of more than 50 major moraines in SE Greenland fjords. Inner-fjord moraines are widespread along the SE Greenland margin, occurring in 65% of the surveyed fjords. We identify, for the first time, nine midfjord moraines that span the approximately 150-km-long eastern margin of the Julianehab Ice Cap. In contrast, midfjord moraines are generally absent from the deeper and wider fjords of the SE GIS. The variable distribution of midfjord moraines along the SE Greenland margin reveals contrasting behavior of the SE GIS and the eastern Julianehab Ice Cap during the last deglaciation, which probably reflects differences in fjord geometry and exposure to ocean heat.