A comparison of modelled ice thickness and volume across the entire Antarctic Peninsula region
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 is...
Published in: | Geografiska Annaler: Series A, Physical Geography |
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Online Access: | https://eprints.lancs.ac.uk/id/eprint/129028/ https://eprints.lancs.ac.uk/id/eprint/129028/1/APicethickness_GEOGANN_final2.pdf |
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ftulancaster:oai:eprints.lancs.ac.uk:129028 2024-05-19T07:28:00+00:00 A comparison of modelled ice thickness and volume across the entire Antarctic Peninsula region Carrivick, Jonathan L. Davies, Bethan J. James, William H.M. McMillan, Malcolm Glasser, Neil F. 2019 application/pdf https://eprints.lancs.ac.uk/id/eprint/129028/ https://eprints.lancs.ac.uk/id/eprint/129028/1/APicethickness_GEOGANN_final2.pdf en eng https://eprints.lancs.ac.uk/id/eprint/129028/1/APicethickness_GEOGANN_final2.pdf Carrivick, Jonathan L. and Davies, Bethan J. and James, William H.M. and McMillan, Malcolm and Glasser, Neil F. (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 creative_commons_attribution_noncommercial_4_0_international_license Journal Article PeerReviewed 2019 ftulancaster 2024-04-23T23:36:48Z 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. Article in Journal/Newspaper Alexander Island Antarc* Antarctic Antarctic Peninsula Graham Land Palmer Land Tidewater Lancaster University: Lancaster Eprints Geografiska Annaler: Series A, Physical Geography 101 1 45 67 |
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Open Polar |
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Lancaster University: Lancaster Eprints |
op_collection_id |
ftulancaster |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Carrivick, Jonathan L. Davies, Bethan J. James, William H.M. McMillan, Malcolm Glasser, Neil F. |
spellingShingle |
Carrivick, Jonathan L. Davies, Bethan J. James, William H.M. McMillan, Malcolm Glasser, Neil F. A comparison of modelled ice thickness and volume across the entire Antarctic Peninsula region |
author_facet |
Carrivick, Jonathan L. Davies, Bethan J. James, William H.M. McMillan, Malcolm Glasser, Neil F. |
author_sort |
Carrivick, Jonathan L. |
title |
A comparison of modelled ice thickness and volume across the entire Antarctic Peninsula region |
title_short |
A comparison of modelled ice thickness and volume across the entire Antarctic Peninsula region |
title_full |
A comparison of modelled ice thickness and volume across the entire Antarctic Peninsula region |
title_fullStr |
A comparison of modelled ice thickness and volume across the entire Antarctic Peninsula region |
title_full_unstemmed |
A comparison of modelled ice thickness and volume across the entire Antarctic Peninsula region |
title_sort |
comparison of modelled ice thickness and volume across the entire antarctic peninsula region |
publishDate |
2019 |
url |
https://eprints.lancs.ac.uk/id/eprint/129028/ https://eprints.lancs.ac.uk/id/eprint/129028/1/APicethickness_GEOGANN_final2.pdf |
genre |
Alexander Island Antarc* Antarctic Antarctic Peninsula Graham Land Palmer Land Tidewater |
genre_facet |
Alexander Island Antarc* Antarctic Antarctic Peninsula Graham Land Palmer Land Tidewater |
op_relation |
https://eprints.lancs.ac.uk/id/eprint/129028/1/APicethickness_GEOGANN_final2.pdf Carrivick, Jonathan L. and Davies, Bethan J. and James, William H.M. and McMillan, Malcolm and Glasser, Neil F. (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 |
op_rights |
creative_commons_attribution_noncommercial_4_0_international_license |
container_title |
Geografiska Annaler: Series A, Physical Geography |
container_volume |
101 |
container_issue |
1 |
container_start_page |
45 |
op_container_end_page |
67 |
_version_ |
1799470396910600192 |