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DOI10.1111/bor.12384
Local ice caps in Finderup Land, North Greenland, survived the Holocene Thermal Maximum
Larsen, Nicolaj K.1,2; Levy, Laura B.3; Strunk, Astrid1; Sondergaard, Anne Sofie1; Olsen, Jesper4; Lauridsen, Torben L.5
发表日期2019
ISSN0300-9483
EISSN1502-3885
卷号48期号:3页码:551-562
英文摘要

Local glaciers and ice caps (GICs) comprise only similar to 5.4% of the total ice volume, but account for similar to 14-20% of the current ice loss in Greenland. The glacial history of GICs is not well constrained, however, and little is known about how they reacted to Holocene climate changes. Specifically, in North Greenland, there is limited knowledge about past GIC fluctuations and whether they survived the Holocene Thermal Maximum (HTM, similar to 8 to 5 ka). In this study, we use proglacial lake records to constrain the ice-marginal fluctuations of three local ice caps in North Greenland including Flade Isblink, the largest ice cap in Greenland. Additionally, we have radiocarbon dated reworked marine molluscs in Little Ice Age (LIA) moraines adjacent to the Flade Isblink, which reveal when the ice cap was smaller than present. We found that outlet glaciers from Flade Isblink retreated inland of their present extent from similar to 9.4 to 0.2cal. ka BP. The proglacial lake records, however, demonstrate that the lakes continued to receive glacial meltwater throughout the entire Holocene. This implies that GICs in Finderup Land survived the HTM. Our results are consistent with other observations from North Greenland but differ from locations in southern Greenland where all records show that the local ice caps at low and intermediate elevations disappeared completely during the HTM. We explain the north-south gradient in glacier response as a result of sensitivity to increased temperature and precipitation. While the increased temperatures during the HTM led to a complete melting of GICs in southern Greenland, GICs remained in North Greenland probably because the melting was counterbalanced by increased precipitation due to a reduction in Arctic sea-ice extent and/or increased poleward moisture transport.


WOS研究方向Physical Geography ; Geology
来源期刊BOREAS
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/99918
作者单位1.Aarhus Univ, Dept Geosci, Hoegh Guldbergs Gade 2, DK-8000 Aarhus, Denmark;
2.Univ Copenhagen, Nat Hist Museum Denmark, Ctr GeoGenet, Oster Voldgade 5-7, DK-1350 Copenhagen K, Denmark;
3.Humboldt State Univ, Dept Geol, 1 Harpst St, Arcata, CA 95521 USA;
4.Aarhus Univ, Dept Phys & Astron, Ny Munkegade 120, DK-8000 Aarhus C, Denmark;
5.Aarhus Univ, Arctic Res Ctr, Dept Biosci, Vejlsovej 25, DK-8600 Silkeborg, Denmark
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GB/T 7714
Larsen, Nicolaj K.,Levy, Laura B.,Strunk, Astrid,et al. Local ice caps in Finderup Land, North Greenland, survived the Holocene Thermal Maximum[J],2019,48(3):551-562.
APA Larsen, Nicolaj K.,Levy, Laura B.,Strunk, Astrid,Sondergaard, Anne Sofie,Olsen, Jesper,&Lauridsen, Torben L..(2019).Local ice caps in Finderup Land, North Greenland, survived the Holocene Thermal Maximum.BOREAS,48(3),551-562.
MLA Larsen, Nicolaj K.,et al."Local ice caps in Finderup Land, North Greenland, survived the Holocene Thermal Maximum".BOREAS 48.3(2019):551-562.
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