Younger Dryas ice margin retreat in Greenland: new evidence from southwestern Greenland
Younger Dryas ice margin retreat in Greenland: new evidence from southwestern Greenland
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格陵兰岛新仙女木冰缘退缩：来自格陵兰岛西南部的新证据
DOI：
10.5194/cp-2020-57
复制
发表时间：
2020
影响因子：
4.3
通讯作者：
K. Kjær
中科院分区：
文献类型：
--
作者：
S. Funder;Anita L. Sørensen;N. K. Larsen;A. Bjørk;J. Briner;J. Olsen;A. Schomacker;L. Levy;K. Kjær
抽象的。迄今为止格陵兰岛冰川消融已进入最后阶段
当内架上的连续冰盖边缘转变为
我们生成了位于槽中的出口冰川以及中间无冰区域的
宇宙成因 10Be 起源于沿线六个离岛的基岩突起
格陵兰岛西南海岸绵延 300 公里的区域。尽管10Be
继承影响某些日期，年龄通常支持格陵兰岛
冰盖 (GrIS) 边缘在中期从内陆架后退
新仙女木期（YD）。已发布 10Be 和 14C 日期的记录
表明 GrIS 边际的这种历史在其他地区也能看到
格陵兰岛，但撤退的范围和速度差异很大，
有时甚至在邻近地区之间。年代顺序延长的地区
进入 Allerød 时期，冰缘没有明显变化
Allerød-YD 转变（格陵兰岛最北端除外）。相比之下，
陆架上的地貌（冰碛和接地区楔形物）已被
建议标明 YD 重新提前或长期冰缘仍保持不变
在中间的架子上。然而，这些功能主要是由
与冰芯温度记录中寒冷时期的相关性。
YD中后期冰缘退缩是由平流解释的
冰缘温暖的地下水和季节性的增加。
因此，我们的结果表明了气候-冰缘的复杂性
关系以及直接确定早期冰消期的迫切需要
格陵兰岛的历史。
Abstract. To date the final stage in deglaciation of the Greenland
shelf, when a contiguous ice sheet margin on the inner shelf transitioned to
outlet glaciers in troughs with intervening ice-free areas, we generated
cosmogenic 10Be dates from bedrock knobs on six outlying islands along
a stretch of 300 km of the southwestern Greenland coast. Despite 10Be
inheritance influencing some dates, the ages generally support a Greenland
Ice Sheet (GrIS) margin that retreated off the inner shelf during the middle
Younger Dryas (YD) period. Published 10Be- and 14C-dated records
show that this history of the GrIS margin is seen in other parts of
Greenland but with large variations in the extent and speed of retreat,
sometimes even between neighbouring areas. Areas with a chronology extending
into the Allerød period show no marked ice margin change at the
Allerød–YD transition except in northernmost Greenland. In contrast,
landforms on the shelf (moraines and grounding zone wedges) have been
suggested to indicate YD readvances or long-lasting ice margin stillstands
on the middle shelf. However, these features have been dated primarily by
correlation with cold periods in the ice core temperature records.
Ice margin retreat during the middle and late YD is explained by advection
of warm subsurface water at the ice margin and by increased seasonality.
Our results therefore point to the complexity of the climate–ice margin
relation and to the urgent need for direct dating of the early deglaciation
history of Greenland.
格陵兰岛东南部沿海地区的冰川消融
DOI：
10.1177/0959683618777067
发表时间：
2018
期刊：
The Holocene
影响因子：
--
作者：
Dyke L
通讯作者：
Dyke L