globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.07.007
论文题名:
The Drangajökull ice cap, northwest Iceland, persisted into the early-mid Holocene
作者: Schomacker A.; Brynjólfsson S.; Andreassen J.M.; Gudmundsdóttir E.R.; Olsen J.; Odgaard B.V.; Håkansson L.; Ingólfsson Ó.; Larsen N.K.
刊名: Quaternary Science Reviews
出版年: 2016
卷: 148
起始页码: 68
结束页码: 84
语种: 英语
英文关键词: Drangajökull ; Glacier ; Holocene ; Holocene thermal maximum ; Lake sediment ; Threshold lake
Scopus关键词: Glacial geology ; Glaciers ; Lakes ; Sedimentation ; Sediments ; Snow ; Glacial history ; Glacial meltwater ; Holocene thermal maximums ; Holocenes ; Lake sediment cores ; Lake sediments ; Temperature optimums ; Winter precipitation ; Ice ; deglaciation ; glacial history ; glaciation ; glacier ; Hypsithermal ; ice cap ; lacustrine deposit ; lacustrine environment ; meltwater ; paleoclimate ; precipitation (climatology) ; sediment core ; tephra ; Drangajokull ; Iceland
英文摘要: Most glaciers and ice caps in Iceland experienced rapid deglaciation in the early Holocene, reaching a minimum extent during the Holocene Thermal Maximum. Here we present evidence of the Holocene glacial history from lake sediment cores retrieved from seven threshold lakes around the Drangajökull ice cap in the Vestfirðir peninsula, NW Iceland. The sediment cores show on/off signals of glacial meltwater activity, as minerogenic material deposited from glacial meltwater alternates with organic-rich material (gyttja) deposited without glacial meltwater. We base the chronology of the sediment cores on 14C ages and geochemical identification of key tephra layers with known ages. A 25-cm thick layer of the Saksunarvatn tephra in Lake Skorarvatn indicates that the northern part of the ice cap had reached a similar size as today or was smaller already by 10.2 cal kyr BP. However, 14C ages of lake sediment cores from the highlands southeast of Drangajökull suggest that this part of the ice cap was larger than today until 7.8–7.2 cal kyr BP. Even today, the Drangajökull ice cap has a different behavior than the main ice caps in Iceland, characterized by a very low glaciation limit. Because palaeoclimatic proxies show an early-mid Holocene temperature optimum in this part of Iceland, we suggest that the persistence of Drangajökull into the early Holocene and, possibly, also the entire Holocene was due to high winter precipitation. © 2016 Elsevier Ltd
资助项目: Schomacker, A. ; Department of Geology, UiT The Arctic University of Norway, Postboks 6050 Langnes, Norway ; 电子邮件: anders.schomacker@uit.no
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59490
Appears in Collections:过去全球变化的重建

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作者单位: Department of Geology, UiT The Arctic University of Norway, Postboks 6050 Langnes, Tromsø, Norway; Icelandic Institute of Natural History, Borgum við Norðurslóð, Akureyri, Iceland; Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus C., Denmark; Institute of Earth Sciences, University of Iceland, Askja, Sturlugata 7, Reykjavík, Iceland; Nordic Volcanological Center, Institute of Earth Sciences, University of Iceland, Askja, Sturlugata 7, Reykjavík, Iceland; Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, Aarhus, Denmark; The University Centre in Svalbard (UNIS), P.O. Box 156, Longyearbyen, Norway; Centre for GeoGenetics, Natural History Museum of Denmark, University of Copenhagen, Øster Voldgade 5-7, Copenhagen K., Denmark

Recommended Citation:
Schomacker A.,Brynjólfsson S.,Andreassen J.M.,et al. The Drangajökull ice cap, northwest Iceland, persisted into the early-mid Holocene[J]. Quaternary Science Reviews,2016-01-01,148
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