Carrivick, JL orcid.org/0000-0002-9286-5348, Davies, BJ, James, WHM orcid.org/0000-0002-3273-4688 et al. (2 more authors) (2019) A comparison of modelled ice thickness and volume across the entire Antarctic Peninsula region. Geografiska Annaler, Series A: Physical Geography, 101 (1). pp. 45-67. ISSN 0435-3676
Abstract
Understanding Antarctic Peninsula glacier evolution requires distributed ice thickness and subglacial topography. To date, 80% of the Antarctic Peninsula mainland ice volume has only been determined at low-resolution (1 km post spacing) and the distributed ice thickness of glaciers on surrounding islands has never been quantified. In this study we applied a perfect plasticity model, selected for its simplicity, low data requirements and minimal parameterisation, to estimate glacier thickness, subglacial topography and ice volume for the entire Antarctic Peninsula region. We compared the output of this simple model to that of a more sophisticated but spatially-restricted model and also to the spatially-coarse but more extensive Bedmap2 dataset. The simple model produced mean differences of 1.4 m (std. dev. 243 m) in comparison with the more sophisticated approach for the mountainous parts of the Peninsula. It produced similar volumes for tidewater glaciers but gave unrealistic ice thickness around grounding lines. Ice thickness across low gradient plateau surfaces are mis-represented by a perfect plasticity model and thus for the southern part of the Peninsula only regional ice volume can be approximated by our model. Overall, with consideration of ice situated below sea level, model results suggest that Trinity Peninsula, Graham Land, the part of Palmer Land north of 74°S and all glaciers on islands contain an ice mass of ∼200 300 Gt, with sea level equivalent of 553 mm (± 11.6 mm). Of this total 8% is from glaciers on islands, 70% of which is from Alexander Island.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 Swedish Society for Anthropology and Geography. This is an Accepted Manuscript of an article published by Taylor & Francis in Geografiska Annaler: Series A, Physical Geography on 31/10/2018, available online: https://doi.org/10.1080/04353676.2018.1539830/ |
Keywords: | Glacie; Antarctica; sea level |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Geography (Leeds) > Centre for Spatial Analysis & Policy (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Geography (Leeds) > River Basin Processes & Management (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 24 Jan 2019 14:48 |
Last Modified: | 31 Oct 2019 01:39 |
Status: | Published |
Publisher: | Taylor & Francis |
Identification Number: | 10.1080/04353676.2018.1539830 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:141457 |