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首页> 外文期刊>Quaternary Science Reviews: The International Multidisciplinary Review Journal >A Younger Dryas re-advance of local glaciers in north Greenland
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A Younger Dryas re-advance of local glaciers in north Greenland

机译：格陵兰北部地区的一个年轻的Dryas冰川再造

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The Younger Dryas (YD) is a well-constrained cold event from 12,900 to 11,700 years ago but it remains unclear how the cooling and subsequent abrupt warming recorded in ice cores was translated into ice margin fluctuations in Greenland. Here we present 1 Be surface exposure ages from three moraines in front of local glaciers on a 50 km stretch along the north coast of Greenland, facing the Arctic Ocean. Ten ages range from 11.6 +/- 0.5 to 27.2 +/- 0.91 a with a mean age of 12.5 +/- 0.7 ka after exclusion of two outliers. We consider this to be a minimum age for the abandonment of the moraines. The ages of the moraines are furthermore constrained using Optically Stimulated Luminescence (OSL) dating of epishelf sediments, which were deposited prior to the ice advance that formed the moraines, yielding a maximum age of 12.4 +/- 0.6 ka, and bracketing the formation and subsequent abandonment of the moraines to within the interval 11.8-13.0 ka ago. This is the first time a synchronous YD glacier advance and subsequent retreat has been recorded for several independent glaciers in Greenland. In most other areas, there is no evidence for re-advance and glaciers were retreating during YD. We explain the different behaviour of the glaciers in northernmost Greenland as a function of their remoteness from the Atlantic Meridional Overturning Circulation (AMOC), which in other areas has been held responsible for modifying the YD drop in temperatures. (C) 2015 Elsevier Ltd. All rights reserved.
机译：从12900到11700年前，年轻树妖（YD）受严峻的寒冷影响，但目前尚不清楚冰芯中记录的降温和随后的突然变暖如何转化为格陵兰岛的冰缘波动。在这里，我们展示了格陵兰岛北海岸面对北冰洋的50 km延伸区域中，来自三个冰川在冰河前的3 Be地表暴露年龄。排除两个异常值后，十个年龄段的范围为11.6 +/- 0.5至27.2 +/- 0.91 a，平均年龄为12.5 +/- 0.7 ka。我们认为这是放弃莫琳的最低年龄。此外，通过使用光刺激发光（OSL）年代表层沉积物来限制mo鼠的年龄，这些沉淀物是在形成advance鼠的冰行进之前沉积的，最大年龄为12.4 +/- 0.6 ka，并将其与随后将壁虎遗弃在11.8-13.0 ka间隔内。这是格陵兰岛数个独立冰川首次同步YD冰川前进和随后的退缩。在大多数其他地区，没有证据表明YD期间冰川会退缩。我们解释了格陵兰最北端冰川的不同行为，是由于它们远离大西洋子午翻转环流（AMOC）的作用，而后者在其他地区被认为是造成YD温度下降的原因。 （C）2015 Elsevier Ltd.保留所有权利。

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