Wilton, D.J., Bigg, G.R. orcid.org/0000-0002-1910-0349, Scourse, J.D. et al. (2 more authors) (2021) Exploring the extent to which fluctuations in ice‐rafted debris reflect mass changes in the source ice sheet : a model–observation comparison using the last British–Irish Ice Sheet. Journal of Quaternary Science, 36 (5). pp. 934-945. ISSN 0267-8179
Abstract
The British and Irish Ice Sheet (BIIS) was highly dynamic during the Late Quaternary, with considerable regional differences in the timing and extent of its change. This was reflected in equally variable offshore ice‐rafted debris (IRD) records. Here we reconcile these two records using the FRUGAL intermediate complexity iceberg–climate model, with varying BIIS catchment‐level iceberg fluxes, to simulate change in IRD origin and magnitude along the western European margin at 1000‐year time steps during the height of the last BIIS glaciation (31–6 ka bp). This modelled IRD variability is compared with existing IRD records from the deep ocean at five cores along this margin. There is general agreement of the temporal and spatial IRD variability between observations and model through this period. The Porcupine Bank off northwestern Ireland was confirmed by the modelling as a major dividing line between sites possessing exclusively northern or southern source regions for offshore IRD. During Heinrich events 1 and 2, the cores show evidence of a proportion of North American IRD, more particularly to the south of the British Isles. Modelling supports this southern bias for likely Heinrich impact, but also suggests North American IRD will only reach the British margin in unusual circumstances.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 The Authors. Journal of Quaternary Science Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | British and Irish Ice Sheet; coupled model; deglaciation; Heinrich event; ice‐rafted debris |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Social Sciences (Sheffield) > Department of Geography (Sheffield) |
Funding Information: | Funder Grant number Natural Environment Research Council NE/J009768/1; NE/R014574/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 17 Mar 2021 08:48 |
Last Modified: | 15 Feb 2022 15:18 |
Status: | Published |
Publisher: | Wiley |
Refereed: | Yes |
Identification Number: | 10.1002/jqs.3273 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:172017 |