Collapse of the North American ice saddle 14,500 years ago caused widespread cooling and reduced ocean overturning circulation
RFI is funded by NERC grant #NE/K008536/1. Numerical climate model simulations made use of the N8 HPC Centre of Excellence (N8 consortium and EPSRC Grant #EP/K000225/1). Collapse of ice sheets can cause significant sea-level rise and widespread climate change. We examine the climatic response to mel...
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/10076 2023-07-02T03:32:36+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 NERC University of St Andrews. School of Earth & Environmental Sciences University of St Andrews. St Andrews Isotope Geochemistry University of St Andrews. Earth and Environmental Sciences 2017-01-10T15:30:10Z 10 application/pdf http://hdl.handle.net/10023/10076 https://doi.org/10.1002/2016GL071849 eng eng Geophysical Research Letters 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 1944-8007 PURE: 248480794 PURE UUID: 1cca33c6-6e5b-42ea-ab50-b9026e5067c6 Scopus: 85009186310 WOS: 000393954900045 ORCID: /0000-0002-3754-1498/work/64034547 http://hdl.handle.net/10023/10076 https://doi.org/10.1002/2016GL071849 NE/M004619/1 © 2016 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. AMOC Ice sheet melt Saddle collapse Older Dryas GE Environmental Sciences NDAS BDC SDG 13 - Climate Action GE Journal article 2017 ftstandrewserep https://doi.org/10.1002/2016GL071849 2023-06-13T18:26:10Z RFI is funded by NERC grant #NE/K008536/1. Numerical climate model simulations made use of the N8 HPC Centre of Excellence (N8 consortium and EPSRC Grant #EP/K000225/1). 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. Publisher PDF Peer reviewed Article in Journal/Newspaper Ice Sheet University of St Andrews: Digital Research Repository Geophysical Research Letters 44 1 383 392 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
AMOC Ice sheet melt Saddle collapse Older Dryas GE Environmental Sciences NDAS BDC SDG 13 - Climate Action GE |
spellingShingle |
AMOC Ice sheet melt Saddle collapse Older Dryas GE Environmental Sciences NDAS BDC SDG 13 - Climate Action GE 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 GE Environmental Sciences NDAS BDC SDG 13 - Climate Action GE |
description |
RFI is funded by NERC grant #NE/K008536/1. Numerical climate model simulations made use of the N8 HPC Centre of Excellence (N8 consortium and EPSRC Grant #EP/K000225/1). 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. Publisher PDF Peer reviewed |
author2 |
NERC University of St Andrews. School of Earth & Environmental Sciences University of St Andrews. St Andrews Isotope Geochemistry University of St Andrews. Earth and Environmental Sciences |
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 |
http://hdl.handle.net/10023/10076 https://doi.org/10.1002/2016GL071849 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Geophysical Research Letters 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 1944-8007 PURE: 248480794 PURE UUID: 1cca33c6-6e5b-42ea-ab50-b9026e5067c6 Scopus: 85009186310 WOS: 000393954900045 ORCID: /0000-0002-3754-1498/work/64034547 http://hdl.handle.net/10023/10076 https://doi.org/10.1002/2016GL071849 NE/M004619/1 |
op_rights |
© 2016 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
op_doi |
https://doi.org/10.1002/2016GL071849 |
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Geophysical Research Letters |
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44 |
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1 |
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383 |
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392 |
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1770272225627209728 |