Deglaciation of the Eurasian ice sheet complex
The Eurasian ice sheet complex (EISC) was the third largest ice mass during the Last Glacial Maximum with a span of over 4500 km and responsible for around 20 m of eustatic sea-level lowering. Whilst recent terrestrial and marine empirical insights have improved understanding of the chronology, patt...
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Language: | English |
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Stockholms universitet, Institutionen för naturgeografi
2017
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145875 https://doi.org/10.1016/j.quascirev.2017.05.019 |
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ftstockholmuniv:oai:DiVA.org:su-145875 2023-05-15T15:38:42+02:00 Deglaciation of the Eurasian ice sheet complex Patton, Henry Hubbard, Alun Andreassen, Karin Auriac, Amandine Whitehouse, Pippa L. Stroeven, Arjen P. Shackleton, Calvin Winsborrow, Monica Heyman, Jakob Hall, Adrian M. 2017 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145875 https://doi.org/10.1016/j.quascirev.2017.05.019 eng eng Stockholms universitet, Institutionen för naturgeografi Quaternary Science Reviews, 0277-3791, 2017, 169, s. 148-172 orcid:0000-0001-8812-2253 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145875 doi:10.1016/j.quascirev.2017.05.019 ISI:000405154100010 info:eu-repo/semantics/openAccess Eurasian ice sheet complex Barents sea Fennoscandian ice sheet Late Weichselian Deglaciation Glacio-isostatic adjustment Subglacial lakes Proglacial hydrology Younger Dryas Fleuve Manche Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Article in journal info:eu-repo/semantics/article text 2017 ftstockholmuniv https://doi.org/10.1016/j.quascirev.2017.05.019 2023-02-23T21:43:29Z The Eurasian ice sheet complex (EISC) was the third largest ice mass during the Last Glacial Maximum with a span of over 4500 km and responsible for around 20 m of eustatic sea-level lowering. Whilst recent terrestrial and marine empirical insights have improved understanding of the chronology, pattern and rates of retreat of this vast ice sheet, a concerted attempt to model the deglaciation of the EISC honouring these new constraints is conspicuously lacking. Here, we apply a first-order, thermo-mechanical ice sheet model, validated against a diverse suite of empirical data, to investigate the retreat of the EISC after 23 ka BP, directly extending the work of Patton et al. (2016) who modelled the build-up to its maximum extent. Retreat of the ice sheet complex was highly asynchronous, reflecting contrasting regional sensitivities to climate forcing, oceanic influence, and internal dynamics. Most rapid retreat was experienced across the Barents Sea sector after 17.8 ka BP when this marine-based ice sheet disintegrated at a rate of similar to 670 gigatonnes per year (Gt a(-1)) through enhanced calving and interior dynamic thinning, driven by oceanic/atmospheric warming and exacerbated by eustatic sea-level rise. From 14.9 to 12.9 ka BP the EISC lost on average 750 Gt a(-1), peaking at rates >3000 Gt a(-1), roughly equally partitioned between surface melt and dynamic losses, and potentially contributing up to 2.5 m to global sea-level rise during Meltwater Pulse 1A. Independent glacio-isostatic modelling constrained by an extensive inventory of relative sea-level change corroborates our ice sheet loading history of the Barents Sea sector. Subglacial conditions were predominately temperate during deglaciation, with over 6000 subglacial lakes predicted along with an extensive subglacial drainage network. Moreover, the maximum EISC and its isostatic footprint had a profound impact on the proglacial hydrological network, forming the Fleuve Manche mega-catchment which had an area of similar to 2.5 x 10(6) km(2) and ... Article in Journal/Newspaper Barents Sea Fennoscandian Ice Sheet Stockholm University: Publications (DiVA) Barents Sea Quaternary Science Reviews 169 148 172 |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Eurasian ice sheet complex Barents sea Fennoscandian ice sheet Late Weichselian Deglaciation Glacio-isostatic adjustment Subglacial lakes Proglacial hydrology Younger Dryas Fleuve Manche Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
spellingShingle |
Eurasian ice sheet complex Barents sea Fennoscandian ice sheet Late Weichselian Deglaciation Glacio-isostatic adjustment Subglacial lakes Proglacial hydrology Younger Dryas Fleuve Manche Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Patton, Henry Hubbard, Alun Andreassen, Karin Auriac, Amandine Whitehouse, Pippa L. Stroeven, Arjen P. Shackleton, Calvin Winsborrow, Monica Heyman, Jakob Hall, Adrian M. Deglaciation of the Eurasian ice sheet complex |
topic_facet |
Eurasian ice sheet complex Barents sea Fennoscandian ice sheet Late Weichselian Deglaciation Glacio-isostatic adjustment Subglacial lakes Proglacial hydrology Younger Dryas Fleuve Manche Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
description |
The Eurasian ice sheet complex (EISC) was the third largest ice mass during the Last Glacial Maximum with a span of over 4500 km and responsible for around 20 m of eustatic sea-level lowering. Whilst recent terrestrial and marine empirical insights have improved understanding of the chronology, pattern and rates of retreat of this vast ice sheet, a concerted attempt to model the deglaciation of the EISC honouring these new constraints is conspicuously lacking. Here, we apply a first-order, thermo-mechanical ice sheet model, validated against a diverse suite of empirical data, to investigate the retreat of the EISC after 23 ka BP, directly extending the work of Patton et al. (2016) who modelled the build-up to its maximum extent. Retreat of the ice sheet complex was highly asynchronous, reflecting contrasting regional sensitivities to climate forcing, oceanic influence, and internal dynamics. Most rapid retreat was experienced across the Barents Sea sector after 17.8 ka BP when this marine-based ice sheet disintegrated at a rate of similar to 670 gigatonnes per year (Gt a(-1)) through enhanced calving and interior dynamic thinning, driven by oceanic/atmospheric warming and exacerbated by eustatic sea-level rise. From 14.9 to 12.9 ka BP the EISC lost on average 750 Gt a(-1), peaking at rates >3000 Gt a(-1), roughly equally partitioned between surface melt and dynamic losses, and potentially contributing up to 2.5 m to global sea-level rise during Meltwater Pulse 1A. Independent glacio-isostatic modelling constrained by an extensive inventory of relative sea-level change corroborates our ice sheet loading history of the Barents Sea sector. Subglacial conditions were predominately temperate during deglaciation, with over 6000 subglacial lakes predicted along with an extensive subglacial drainage network. Moreover, the maximum EISC and its isostatic footprint had a profound impact on the proglacial hydrological network, forming the Fleuve Manche mega-catchment which had an area of similar to 2.5 x 10(6) km(2) and ... |
format |
Article in Journal/Newspaper |
author |
Patton, Henry Hubbard, Alun Andreassen, Karin Auriac, Amandine Whitehouse, Pippa L. Stroeven, Arjen P. Shackleton, Calvin Winsborrow, Monica Heyman, Jakob Hall, Adrian M. |
author_facet |
Patton, Henry Hubbard, Alun Andreassen, Karin Auriac, Amandine Whitehouse, Pippa L. Stroeven, Arjen P. Shackleton, Calvin Winsborrow, Monica Heyman, Jakob Hall, Adrian M. |
author_sort |
Patton, Henry |
title |
Deglaciation of the Eurasian ice sheet complex |
title_short |
Deglaciation of the Eurasian ice sheet complex |
title_full |
Deglaciation of the Eurasian ice sheet complex |
title_fullStr |
Deglaciation of the Eurasian ice sheet complex |
title_full_unstemmed |
Deglaciation of the Eurasian ice sheet complex |
title_sort |
deglaciation of the eurasian ice sheet complex |
publisher |
Stockholms universitet, Institutionen för naturgeografi |
publishDate |
2017 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145875 https://doi.org/10.1016/j.quascirev.2017.05.019 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Fennoscandian Ice Sheet |
genre_facet |
Barents Sea Fennoscandian Ice Sheet |
op_relation |
Quaternary Science Reviews, 0277-3791, 2017, 169, s. 148-172 orcid:0000-0001-8812-2253 http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145875 doi:10.1016/j.quascirev.2017.05.019 ISI:000405154100010 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.quascirev.2017.05.019 |
container_title |
Quaternary Science Reviews |
container_volume |
169 |
container_start_page |
148 |
op_container_end_page |
172 |
_version_ |
1766369948806938624 |