Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum
The last deglaciation of the Laurentide Ice Sheet (LIS) was associated with major reorganisations in the ocean-climate system and its retreat also represents a valuable analogue for understanding the rates and mechanisms of ice sheet collapse. This paper reviews the characteristics of the LIS at its...
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Format: | Article in Journal/Newspaper |
Language: | English |
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2017
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Online Access: | https://dialnet.unirioja.es/servlet/oaiart?codigo=6122883 |
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ftdialnet:oai:dialnet.unirioja.es:ART0001315476 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Dialnet - Portada de revistas (Universidad de La Rioja) |
op_collection_id |
ftdialnet |
language |
English |
topic |
Laurentide Ice Sheet Last Glacial Maximum deglaciation ice streams Inlandsis Lauréntide Último Máximo Glaciar deglaciación ríos de hielo |
spellingShingle |
Laurentide Ice Sheet Last Glacial Maximum deglaciation ice streams Inlandsis Lauréntide Último Máximo Glaciar deglaciación ríos de hielo Stokes, Chris R. Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum |
topic_facet |
Laurentide Ice Sheet Last Glacial Maximum deglaciation ice streams Inlandsis Lauréntide Último Máximo Glaciar deglaciación ríos de hielo |
description |
The last deglaciation of the Laurentide Ice Sheet (LIS) was associated with major reorganisations in the ocean-climate system and its retreat also represents a valuable analogue for understanding the rates and mechanisms of ice sheet collapse. This paper reviews the characteristics of the LIS at its Last Glacial Maximum (LGM) and its subsequent deglaciation, with particular emphasis on the pattern and timing of ice margin recession and the driving mechanisms of retreat. The LIS initiated over the eastern Canadian Arctic ~116-110 ka (MIS 5d), but its growth towards the LGM was highly non-linear and punctuated by several episodes of expansion (~65 ka: MIS 4) and retreat (~50-40 ka: MIS 3). It attained its maximum position around 26-25 ka (MIS 2) and existed for several thousand years as an extensive ice sheet with major domes over Keewatin, Foxe Basin and northern Quebec/Labrador. It extended to the edge of the continental shelf at its marine margins and likely stored a sea-level equivalent of around 50 m and with a maximum ice surface ~3,000 m above present sea-level. Retreat from its maximum was triggered by an increase in boreal summer insolation, but areal shrinkage was initially slow and the net surface mass balance was positive, indicating that ice streams likely played an important role in reducing the ice sheet volume, if not its extent, via calving at marine margins. Between ~16 and ~13 ka, the ice sheet margin retreated more rapidly, particularly in the south and west, whereas the north and east underwent only minimal recession. The overall rate of retreat decreased during the Younger Dryas (YD), when several localised readvances occurred. Following the YD, the ice sheet retreated two to five times faster than previously, and this was primarily driven by enhanced surface melting while ice streams reduced in effectiveness. Final deglaciation of the Keewatin and Foxe Domes, left a remnant Labrador Dome that disappeared ~6.7 ka. La última deglaciación del inlandsis Lauréntide (LIS) estuvo relacionada con ... |
format |
Article in Journal/Newspaper |
author |
Stokes, Chris R. |
author_facet |
Stokes, Chris R. |
author_sort |
Stokes, Chris R. |
title |
Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum |
title_short |
Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum |
title_full |
Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum |
title_fullStr |
Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum |
title_full_unstemmed |
Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum |
title_sort |
deglaciation of the laurentide ice sheet from the last glacial maximum |
publishDate |
2017 |
url |
https://dialnet.unirioja.es/servlet/oaiart?codigo=6122883 |
long_lat |
ENVELOPE(-58.133,-58.133,-62.083,-62.083) ENVELOPE(-77.918,-77.918,65.931,65.931) |
geographic |
Arctic Hielo Foxe Basin |
geographic_facet |
Arctic Hielo Foxe Basin |
genre |
Arctic Foxe Basin Ice Sheet Inlandsis Keewatin |
genre_facet |
Arctic Foxe Basin Ice Sheet Inlandsis Keewatin |
op_source |
Cuadernos de investigación geográfica / Geographical Research Letters, ISSN 0211-6820, Nº. 43, 2, 2017, pags. 377-428 |
op_relation |
https://dialnet.unirioja.es/servlet/oaiart?codigo=6122883 (Revista) ISSN 0211-6820 |
op_rights |
LICENCIA DE USO: Los documentos a texto completo incluidos en Dialnet son de acceso libre y propiedad de sus autores y/o editores. Por tanto, cualquier acto de reproducción, distribución, comunicación pública y/o transformación total o parcial requiere el consentimiento expreso y escrito de aquéllos. Cualquier enlace al texto completo de estos documentos deberá hacerse a través de la URL oficial de éstos en Dialnet. Más información: https://dialnet.unirioja.es/info/derechosOAI | INTELLECTUAL PROPERTY RIGHTS STATEMENT: Full text documents hosted by Dialnet are protected by copyright and/or related rights. This digital object is accessible without charge, but its use is subject to the licensing conditions set by its authors or editors. Unless expressly stated otherwise in the licensing conditions, you are free to linking, browsing, printing and making a copy for your own personal purposes. All other acts of reproduction and communication to the public are subject to the licensing conditions expressed by editors and authors and require consent from them. Any link to this document should be made using its official URL in Dialnet. More info: https://dialnet.unirioja.es/info/derechosOAI |
_version_ |
1766347413011824640 |
spelling |
ftdialnet:oai:dialnet.unirioja.es:ART0001315476 2023-05-15T15:17:09+02:00 Deglaciation of the Laurentide Ice Sheet from the Last Glacial Maximum Stokes, Chris R. 2017 application/pdf https://dialnet.unirioja.es/servlet/oaiart?codigo=6122883 eng eng https://dialnet.unirioja.es/servlet/oaiart?codigo=6122883 (Revista) ISSN 0211-6820 LICENCIA DE USO: Los documentos a texto completo incluidos en Dialnet son de acceso libre y propiedad de sus autores y/o editores. Por tanto, cualquier acto de reproducción, distribución, comunicación pública y/o transformación total o parcial requiere el consentimiento expreso y escrito de aquéllos. Cualquier enlace al texto completo de estos documentos deberá hacerse a través de la URL oficial de éstos en Dialnet. Más información: https://dialnet.unirioja.es/info/derechosOAI | INTELLECTUAL PROPERTY RIGHTS STATEMENT: Full text documents hosted by Dialnet are protected by copyright and/or related rights. This digital object is accessible without charge, but its use is subject to the licensing conditions set by its authors or editors. Unless expressly stated otherwise in the licensing conditions, you are free to linking, browsing, printing and making a copy for your own personal purposes. All other acts of reproduction and communication to the public are subject to the licensing conditions expressed by editors and authors and require consent from them. Any link to this document should be made using its official URL in Dialnet. More info: https://dialnet.unirioja.es/info/derechosOAI Cuadernos de investigación geográfica / Geographical Research Letters, ISSN 0211-6820, Nº. 43, 2, 2017, pags. 377-428 Laurentide Ice Sheet Last Glacial Maximum deglaciation ice streams Inlandsis Lauréntide Último Máximo Glaciar deglaciación ríos de hielo text (article) 2017 ftdialnet 2019-08-29T12:12:23Z The last deglaciation of the Laurentide Ice Sheet (LIS) was associated with major reorganisations in the ocean-climate system and its retreat also represents a valuable analogue for understanding the rates and mechanisms of ice sheet collapse. This paper reviews the characteristics of the LIS at its Last Glacial Maximum (LGM) and its subsequent deglaciation, with particular emphasis on the pattern and timing of ice margin recession and the driving mechanisms of retreat. The LIS initiated over the eastern Canadian Arctic ~116-110 ka (MIS 5d), but its growth towards the LGM was highly non-linear and punctuated by several episodes of expansion (~65 ka: MIS 4) and retreat (~50-40 ka: MIS 3). It attained its maximum position around 26-25 ka (MIS 2) and existed for several thousand years as an extensive ice sheet with major domes over Keewatin, Foxe Basin and northern Quebec/Labrador. It extended to the edge of the continental shelf at its marine margins and likely stored a sea-level equivalent of around 50 m and with a maximum ice surface ~3,000 m above present sea-level. Retreat from its maximum was triggered by an increase in boreal summer insolation, but areal shrinkage was initially slow and the net surface mass balance was positive, indicating that ice streams likely played an important role in reducing the ice sheet volume, if not its extent, via calving at marine margins. Between ~16 and ~13 ka, the ice sheet margin retreated more rapidly, particularly in the south and west, whereas the north and east underwent only minimal recession. The overall rate of retreat decreased during the Younger Dryas (YD), when several localised readvances occurred. Following the YD, the ice sheet retreated two to five times faster than previously, and this was primarily driven by enhanced surface melting while ice streams reduced in effectiveness. Final deglaciation of the Keewatin and Foxe Domes, left a remnant Labrador Dome that disappeared ~6.7 ka. La última deglaciación del inlandsis Lauréntide (LIS) estuvo relacionada con ... Article in Journal/Newspaper Arctic Foxe Basin Ice Sheet Inlandsis Keewatin Dialnet - Portada de revistas (Universidad de La Rioja) Arctic Hielo ENVELOPE(-58.133,-58.133,-62.083,-62.083) Foxe Basin ENVELOPE(-77.918,-77.918,65.931,65.931) |