Climatic control of the surge periodicity of an Icelandic outlet glacier

Surging outlet glaciers are important in draining large ice caps, but the mechanisms controlling surge periodicities are poorly known. We investigated a sediment sequence from the glacier-fed Lake Logurinn in eastern Iceland, and our unique annually resolved data, based on sedimentary varves, imply...

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Bibliographic Details
Published in:Journal of Quaternary Science
Main Authors: Striberger, Johan, Björck, Svante, Benediktsson, Ivar Orn, Snowball, Ian, Bertacchi Uvo, Cintia, Ingolfsson, Olafur, Kjaer, Kurt H.
Format: Article in Journal/Newspaper
Language:English
Published: John Wiley & Sons Inc. 2011
Subjects:
Geology
Water Engineering
climate
glacial surge
Iceland
surge periodicity
varved lake
sediments
glacier
Online Access:https://lup.lub.lu.se/record/2186840
https://doi.org/10.1002/jqs.1527
Description
Summary:Surging outlet glaciers are important in draining large ice caps, but the mechanisms controlling surge periodicities are poorly known. We investigated a sediment sequence from the glacier-fed Lake Logurinn in eastern Iceland, and our unique annually resolved data, based on sedimentary varves, imply that Eyjabakkajokull, an outlet glacier of Vatnajokull, began surging about 2200 cal a BP (before 1950 AD). Approximately 1700 cal a BP, the glacier started to surge at a uniform 34- to 38-year periodicity that prevailed until the coldest part of the Little Ice Age when the periodicity almost halved to 21-23 years. Since the late 1800s the surge periodicity of Eyjabakkajokull has returned to a longer period of 35-40 years. We suggest that surge periodicities of Eyjabakkajokull are forced by climatically driven mass balance changes, which may be a common forcing factor for similar surge-type outlet glaciers. Copyright (C) 2011 John Wiley & Sons, Ltd.

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