Holocene history of the Helheim Glacier, southeast Greenland

Holocene history of the Helheim Glacier, southeast Greenland
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格陵兰东南部赫尔海姆冰川的全新世历史

DOI:
10.1016/j.quascirev.2018.06.018
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发表时间:
2018
影响因子:
4
通讯作者:
Bjørk A
Bjørk A
中科院分区:
地球科学1区
文献类型:
--
作者:
Bjørk A

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赫尔海姆冰川是格陵兰冰原 (GrIS) 流动最快、排冰最多的出口之一。在经历了 2000 年代初的快速加速之后,了解其长期质量平衡和动态变得越来越重要。在这里,我们首次记录了赫尔海姆冰川在最初的冰消之后发生的全新世冰缘变化的直接记录。通过分析当前冰缘附近湖泊的岩芯,我们确定了前进和后退的时期。我们的目标是阈值湖泊,这些湖泊只有在边缘处于高级位置时才会接收冰川融水,类似于现在。我们发现,在 10.5 至 9.6cal ka BP 期间,赫尔海姆冰川的范围与今天的范围相似,此后在全新世的大部分时间里它一直在收缩,直到重新前进使其在大约 10 世纪达到目前的范围。 0.3cal ka BP,小冰河时期 (LIA)。因此,赫尔海姆冰川目前的范围是自上次消融以来最大的,其全新世历史表明,它有能力在数千年的变暖和消退后恢复。此外,在9.3和8.2ka寒冷事件以及新冰河早期等期间,没有超出目前位置的进展表明在全新世的大部分时间里出现了大幅后退。
Helheim Glacier ranks among the fastest flowing and most ice discharging outlets of the Greenland Ice Sheet (GrIS). After undergoing rapid speed-up in the early 2000s, understanding its long-term mass balance and dynamic has become increasingly important. Here, we present the first record of direct Holocene ice-marginal changes of the Helheim Glacier following the initial deglaciation. By analysing cores from lakes adjacent to the present ice margin, we pinpoint periods of advance and retreat. We target threshold lakes, which receive glacial meltwater only when the margin is at an advanced position, similar to the present. We show that, during the period from 10.5 to 9.6 cal ka BP, the extent of Helheim Glacier was similar to that of todays, after which it remained retracted for most of the Holocene until a re-advance caused it to reach its present extent at c. 0.3 cal ka BP, during the Little Ice Age (LIA). Thus, Helheim Glacier's present extent is the largest since the last deglaciation, and its Holocene history shows that it is capable of recovering after several millennia of warming and retreat. Furthermore, the absence of advances beyond the present-day position during for example the 9.3 and 8.2 ka cold events as well as the early-Neoglacial suggest a substantial retreat during most of the Holocene.
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