Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation
Collapse of ice sheets can cause significant sea-level rise and widespread climate change. We examine the climatic response to meltwater generated by the collapse of the Cordilleran-Laurentide ice saddle (North America) ~14.5 thousand years ago (ka) using a high-resolution drainage model coupled to...
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/collapse-of-the-north-american-ice-saddle-14500-years-ago-caused-widespread-cooling-and-reduced-ocean-overturning-circulation(1cca33c6-6e5b-42ea-ab50-b9026e5067c6).html https://doi.org/10.1002/2016GL071849 https://research-repository.st-andrews.ac.uk/bitstream/10023/10076/1/Ivanovic_et_al_2017_Geophysical_Research_Letters.pdf |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/1cca33c6-6e5b-42ea-ab50-b9026e5067c6 2023-05-15T16:40:57+02:00 Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation Ivanovic, Ruza F. Gregoire, Lauren J. Wickert, Andrew D. Valdes, Paul J. Burke, Andrea 2017-01-16 application/pdf https://risweb.st-andrews.ac.uk/portal/en/researchoutput/collapse-of-the-north-american-ice-saddle-14500-years-ago-caused-widespread-cooling-and-reduced-ocean-overturning-circulation(1cca33c6-6e5b-42ea-ab50-b9026e5067c6).html https://doi.org/10.1002/2016GL071849 https://research-repository.st-andrews.ac.uk/bitstream/10023/10076/1/Ivanovic_et_al_2017_Geophysical_Research_Letters.pdf eng eng info:eu-repo/semantics/openAccess Ivanovic , R F , Gregoire , L J , Wickert , A D , Valdes , P J & Burke , A 2017 , ' Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation ' , Geophysical Research Letters , vol. 44 , no. 1 , pp. 383-392 . https://doi.org/10.1002/2016GL071849 AMOC Ice sheet melt Saddle collapse Older Dryas article 2017 ftunstandrewcris https://doi.org/10.1002/2016GL071849 2022-06-02T07:46:55Z Collapse of ice sheets can cause significant sea-level rise and widespread climate change. We examine the climatic response to meltwater generated by the collapse of the Cordilleran-Laurentide ice saddle (North America) ~14.5 thousand years ago (ka) using a high-resolution drainage model coupled to an ocean-atmosphere-vegetation general circulation model. Equivalent to 7.26 m global mean sea-level rise in 340 years, the meltwater caused a 6 sverdrup weakening of Atlantic Meridional Overturning Circulation (AMOC) and widespread Northern Hemisphere cooling of 1-5 °C. The greatest cooling is in the Atlantic-sector high latitudes during Boreal winter (by 5-10 °C), but there is also strong summer warming of 1-3 °C over eastern North America. Following recent suggestions that the saddle collapse was triggered by the Bølling warming event ~14.7-14.5 ka, we conclude that this robust submillennial mechanism may have initiated the end of the warming and/or the Older Dryas cooling through a forced AMOC weakening. Article in Journal/Newspaper Ice Sheet University of St Andrews: Research Portal Geophysical Research Letters 44 1 383 392 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
AMOC Ice sheet melt Saddle collapse Older Dryas |
spellingShingle |
AMOC Ice sheet melt Saddle collapse Older Dryas Ivanovic, Ruza F. Gregoire, Lauren J. Wickert, Andrew D. Valdes, Paul J. Burke, Andrea Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation |
topic_facet |
AMOC Ice sheet melt Saddle collapse Older Dryas |
description |
Collapse of ice sheets can cause significant sea-level rise and widespread climate change. We examine the climatic response to meltwater generated by the collapse of the Cordilleran-Laurentide ice saddle (North America) ~14.5 thousand years ago (ka) using a high-resolution drainage model coupled to an ocean-atmosphere-vegetation general circulation model. Equivalent to 7.26 m global mean sea-level rise in 340 years, the meltwater caused a 6 sverdrup weakening of Atlantic Meridional Overturning Circulation (AMOC) and widespread Northern Hemisphere cooling of 1-5 °C. The greatest cooling is in the Atlantic-sector high latitudes during Boreal winter (by 5-10 °C), but there is also strong summer warming of 1-3 °C over eastern North America. Following recent suggestions that the saddle collapse was triggered by the Bølling warming event ~14.7-14.5 ka, we conclude that this robust submillennial mechanism may have initiated the end of the warming and/or the Older Dryas cooling through a forced AMOC weakening. |
format |
Article in Journal/Newspaper |
author |
Ivanovic, Ruza F. Gregoire, Lauren J. Wickert, Andrew D. Valdes, Paul J. Burke, Andrea |
author_facet |
Ivanovic, Ruza F. Gregoire, Lauren J. Wickert, Andrew D. Valdes, Paul J. Burke, Andrea |
author_sort |
Ivanovic, Ruza F. |
title |
Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation |
title_short |
Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation |
title_full |
Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation |
title_fullStr |
Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation |
title_full_unstemmed |
Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation |
title_sort |
collapse of the north american ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation |
publishDate |
2017 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/collapse-of-the-north-american-ice-saddle-14500-years-ago-caused-widespread-cooling-and-reduced-ocean-overturning-circulation(1cca33c6-6e5b-42ea-ab50-b9026e5067c6).html https://doi.org/10.1002/2016GL071849 https://research-repository.st-andrews.ac.uk/bitstream/10023/10076/1/Ivanovic_et_al_2017_Geophysical_Research_Letters.pdf |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Ivanovic , R F , Gregoire , L J , Wickert , A D , Valdes , P J & Burke , A 2017 , ' Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation ' , Geophysical Research Letters , vol. 44 , no. 1 , pp. 383-392 . https://doi.org/10.1002/2016GL071849 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2016GL071849 |
container_title |
Geophysical Research Letters |
container_volume |
44 |
container_issue |
1 |
container_start_page |
383 |
op_container_end_page |
392 |
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1766031377863540736 |