Ice streams in the Laurentide Ice Sheet: a new mapping inventory

Ice streams in the Laurentide Ice Sheet: a new mapping inventory
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劳伦泰冰原中的冰流:新的测绘清单

DOI:
10.1080/17445647.2014.912036
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发表时间:
2014
期刊:
影响因子:
2.2
通讯作者:
Margold M
Margold M
中科院分区:
地球科学3区
文献类型:
--
作者:
Margold M

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快速流动的冰流主导着大陆冰盖的排水,是其质量平衡的关键组成部分。由于它们对海平面的潜在影响,近几十年来,它们在南极和格陵兰冰盖的活动受到了详细的审查。然而,这些观测只涵盖了它们“寿命”的一小部分,而且促进它们快速流动的冰下过程非常难以观测。为了解决这些问题,许多工作人员强调了研究古冰流轨迹的潜力,这些轨迹保存在前冰盖的地形和沉积记录中。因此,了解古冰流在何时何地活动变得越来越重要。在本文中,我们提出了一个新的地图,冰流在北美劳伦特冰盖(LIS,包括因努伊特冰盖),这是最大的短暂的更新世冰盖和许多冰流已被确定。我们汇编了以前发表的冰流活动的证据,并补充了新的映射,以生成迄今为止最完整和一致的映射清单。这张地图描绘的冰流数量是以前清单的近三倍(总共117条),并根据它们留下的证据对它们进行了分类,其中一些位置比其他位置更具推测性。该地图大大改善了我们对LIS动态的理解,但有一个明确的要求,改进冰流活动的测年。
Rapidly flowing ice streams dominate the drainage of continental ice sheets and are a key component of their mass balance. Due to their potential impact on sea level, their activity in the Antarctic and Greenland Ice Sheets has undergone detailed scrutiny in recent decades. However, these observations only cover a fraction of their ‘life-span’ and the subglacial processes that facilitate their rapid flow are very difficult to observe. To circumvent these problems, numerous workers have highlighted the potential of investigating palaeo-ice streams tracks, preserved in the landform and sedimentary record of former ice sheets. As such, it is becoming increasingly important to know where and when palaeo-ice streams operated. In this paper, we present a new map of ice streams in the North American Laurentide Ice Sheet (LIS; including the Innuitian Ice Sheet), which was the largest of the ephemeral Pleistocene ice sheets and where numerous ice streams have been identified. We compile previously published evidence of ice stream activity and complement it with new mapping to generate the most complete and consistent mapping inventory to date. The map depicts close to three times as many ice streams (117 in total) compared to previous inventories, and categorises them according to the evidence they left behind, with some locations more speculative than others. The map considerably refines our understanding of LIS dynamics, but there is a clear requirement for improved dating of ice stream activity.
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