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
中科院分区:
文献类型:
--
作者:
Bjørk A
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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影响因子:
2.8
作者:
L. Tarasov;W. Peltier
通讯作者:
W. Peltier
影响因子:
4
作者:
N. K. Larsen;S. Funder;K. Kjær;K. Kjeldsen;M. Knudsen;H. Linge
通讯作者:
H. Linge
影响因子:
56.9
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T. Baugé
影响因子:
3.9
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N. Korsgaard;A. Schomacker;Í. Benediktsson;N. K. Larsen;Ó. Ingólfsson;K. Kjær
通讯作者:
K. Kjær
影响因子:
2.3
作者:
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通讯作者:
A. Ludikova