Minimal Holocene retreat of large tidewater glaciers in Køge Bugt, southeast Greenland.
Minimal Holocene retreat of large tidewater glaciers in Køge Bugt, southeast Greenland.
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DOI：
10.1038/s41598-017-12018-x
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发表时间：
2017-09-26
影响因子：
4.6
通讯作者：
Vermassen F
中科院分区：
文献类型：
--
作者：
Dyke LM;Andresen CS;Seidenkrantz MS;Hughes ALC;Hiemstra JF;Murray T;Bjørk AA;Sutherland DA;Vermassen F
格陵兰岛东南部的Køge Bugt拥有格陵兰冰原中最大的三座冰川；这些都是过去二十年来冰损失的主要原因。尽管它很重要，但该地区的全新世历史尚未被调查。我们通过分析有孔虫组合、浮冰碎屑丰度和可分类的粉砂粒度数据，提出了9100年来冰川和海洋变化的沉积物岩心记录。结果表明：冰筏碎屑在整个岩心不断堆积；这表明在过去的9100年里，Køge Bugt的冰川一直处于潮汐环境中。这一观测结果限制了这里全新世冰川最大退缩距离现在位置不到6公里。尽管全新世早期的海洋和气候条件至少和现在一样温暖，但退缩是最小的。Køge Bugt全新世冰川有限退缩受该地区冰下地形控制；陡峭的河床使冰川在退缩时稳定下来。这些发现强调了在预测未来行为时考虑单个冰川几何形状的必要性。我们预计，尽管大气和海洋将持续变暖，但Køge Bugt的冰川在不久的将来仍将保持稳定的形态。
Køge Bugt, in southeast Greenland, hosts three of the largest glaciers of the Greenland Ice Sheet; these have been major contributors to ice loss in the last two decades. Despite its importance, the Holocene history of this area has not been investigated. We present a 9100 year sediment core record of glaciological and oceanographic changes from analysis of foraminiferal assemblages, the abundance of ice-rafted debris, and sortable silt grain size data. Results show that ice-rafted debris accumulated constantly throughout the core; this demonstrates that glaciers in Køge Bugt remained in tidewater settings throughout the last 9100 years. This observation constrains maximum Holocene glacier retreat here to less than 6 km from present-day positions. Retreat was minimal despite oceanic and climatic conditions during the early-Holocene that were at least as warm as the present-day. The limited Holocene retreat of glaciers in Køge Bugt was controlled by the subglacial topography of the area; the steeply sloping bed allowed glaciers here to stabilise during retreat. These findings underscore the need to account for individual glacier geometry when predicting future behaviour. We anticipate that glaciers in Køge Bugt will remain in stable configurations in the near-future, despite the predicted continuation of atmospheric and oceanic warming.
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