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Long-term record of Barents Sea Ice Sheet advance to the shelf edge from a 140,000 year record.

Pope, E.L. and Talling, P.J. and Hunt, J.E. and Dowdeswell, J.A. and Allin, J.R. and Cartigny, M.J.B. and Long, D. and Mozzato, A. and Stanford, J.D. and Tappin, D.R. and Watts, M. (2016) 'Long-term record of Barents Sea Ice Sheet advance to the shelf edge from a 140,000 year record.', Quaternary science reviews., 150 . pp. 55-66.

Abstract

The full-glacial extent and deglacial behaviour of marine-based ice sheets, such as the Barents Sea Ice Sheet, is well documented since the Last Glacial Maximum about 20,000 years ago. However, reworking of older sea-floor sediments and landforms during repeated Quaternary advances across the shelf typically obscures their longer-term behaviour, which hampers our understanding. Here, we provide the first detailed long-term record of Barents Sea Ice Sheet advances, using the timing of debris-flows on the Bear Island Trough-Mouth Fan. Ice advanced to the shelf edge during four distinct periods over the last 140,000 years. By far the largest sediment volumes were delivered during the oldest advance more than 128,000 years ago. Later advances occurred from 68,000 to 60,000, 39,400 to 36,000 and 26,000 to 20,900 years before present. The debris-flows indicate that the dynamics of the Saalian and the Weichselian Barents Sea Ice Sheet were very different. The repeated ice advance and retreat cycles during the Weichselian were shorter lived than those seen in the Saalian. Sediment composition shows the configuration of the ice sheet was also different between the two glacial periods, implying that the ice feeding the Bear Island Ice stream came predominantly from Scandinavia during the Saalian, whilst it drained more ice from east of Svalbard during the Weichselian.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.quascirev.2016.08.014
Publisher statement:© 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Date accepted:09 August 2016
Date deposited:15 December 2016
Date of first online publication:24 August 2016
Date first made open access:15 December 2016

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