Timing of glacial retreat in the Wicklow Mountains, Ireland, conditioned by glacier size and topography
ABSTRACT Reconstructing the deglacial history of palaeo‐glaciers provides vital information on retreat processes, information which can inform predictions of the future behaviour of many of the world's glaciers. On this basis, this paper presents 170 Schmidt Hammer exposure ages from moraine bo...
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crwiley:10.1002/jqs.3040 2024-06-02T08:14:20+00:00 Timing of glacial retreat in the Wicklow Mountains, Ireland, conditioned by glacier size and topography Tomkins, Matt D. Dortch, Jason M. Hughes, Philip D. Huck, Jonny J. Tonkin, Toby N. Barr, Iestyn D. University Of Manchester 2018 http://dx.doi.org/10.1002/jqs.3040 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3040 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3040 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 33, issue 6, page 611-623 ISSN 0267-8179 1099-1417 journal-article 2018 crwiley https://doi.org/10.1002/jqs.3040 2024-05-03T11:30:33Z ABSTRACT Reconstructing the deglacial history of palaeo‐glaciers provides vital information on retreat processes, information which can inform predictions of the future behaviour of many of the world's glaciers. On this basis, this paper presents 170 Schmidt Hammer exposure ages from moraine boulders and glacially sculpted bedrock to reveal the post‐Last Glacial Maximum (LGM) history of the Wicklow Mountains, Ireland. These data suggest that large ice masses survived for 4–7 ka after retreat of the Irish Sea Ice Stream and were sustained by summit ice fields until ∼16.6 ka. Post‐LGM retreat was driven by climate and involved numerous short‐term ice front oscillations (≤1 ka), with widespread moraine deposition during Heinrich Stadial 1. In contrast, marked asynchroneity in the timing of Younger Dryas deglaciation is closely linked to snow redistribution which demonstrates the sensitivity of small cirque glaciers (≤1 km 2 ) to local topography. This result has important implications for palaeoclimate reconstructions as cirque glacier dynamics may be (at least partly) decoupled from climate. This is further complicated by post‐depositional processes which can result in moraine ages (e.g. 10 Be) which post‐date retreat. Future palaeoclimate studies should prioritize cirques where snow‐contributing areas are small and where post‐depositional disturbance of moraines is limited. Article in Journal/Newspaper Sea ice Wiley Online Library Journal of Quaternary Science 33 6 611 623 |
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Wiley Online Library |
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English |
description |
ABSTRACT Reconstructing the deglacial history of palaeo‐glaciers provides vital information on retreat processes, information which can inform predictions of the future behaviour of many of the world's glaciers. On this basis, this paper presents 170 Schmidt Hammer exposure ages from moraine boulders and glacially sculpted bedrock to reveal the post‐Last Glacial Maximum (LGM) history of the Wicklow Mountains, Ireland. These data suggest that large ice masses survived for 4–7 ka after retreat of the Irish Sea Ice Stream and were sustained by summit ice fields until ∼16.6 ka. Post‐LGM retreat was driven by climate and involved numerous short‐term ice front oscillations (≤1 ka), with widespread moraine deposition during Heinrich Stadial 1. In contrast, marked asynchroneity in the timing of Younger Dryas deglaciation is closely linked to snow redistribution which demonstrates the sensitivity of small cirque glaciers (≤1 km 2 ) to local topography. This result has important implications for palaeoclimate reconstructions as cirque glacier dynamics may be (at least partly) decoupled from climate. This is further complicated by post‐depositional processes which can result in moraine ages (e.g. 10 Be) which post‐date retreat. Future palaeoclimate studies should prioritize cirques where snow‐contributing areas are small and where post‐depositional disturbance of moraines is limited. |
author2 |
University Of Manchester |
format |
Article in Journal/Newspaper |
author |
Tomkins, Matt D. Dortch, Jason M. Hughes, Philip D. Huck, Jonny J. Tonkin, Toby N. Barr, Iestyn D. |
spellingShingle |
Tomkins, Matt D. Dortch, Jason M. Hughes, Philip D. Huck, Jonny J. Tonkin, Toby N. Barr, Iestyn D. Timing of glacial retreat in the Wicklow Mountains, Ireland, conditioned by glacier size and topography |
author_facet |
Tomkins, Matt D. Dortch, Jason M. Hughes, Philip D. Huck, Jonny J. Tonkin, Toby N. Barr, Iestyn D. |
author_sort |
Tomkins, Matt D. |
title |
Timing of glacial retreat in the Wicklow Mountains, Ireland, conditioned by glacier size and topography |
title_short |
Timing of glacial retreat in the Wicklow Mountains, Ireland, conditioned by glacier size and topography |
title_full |
Timing of glacial retreat in the Wicklow Mountains, Ireland, conditioned by glacier size and topography |
title_fullStr |
Timing of glacial retreat in the Wicklow Mountains, Ireland, conditioned by glacier size and topography |
title_full_unstemmed |
Timing of glacial retreat in the Wicklow Mountains, Ireland, conditioned by glacier size and topography |
title_sort |
timing of glacial retreat in the wicklow mountains, ireland, conditioned by glacier size and topography |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/jqs.3040 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.3040 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.3040 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Journal of Quaternary Science volume 33, issue 6, page 611-623 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.3040 |
container_title |
Journal of Quaternary Science |
container_volume |
33 |
container_issue |
6 |
container_start_page |
611 |
op_container_end_page |
623 |
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1800738134878584832 |