Abrupt cold events in the North Atlantic Ocean in a transient Holocene simulation
Abrupt cold events have been detected in numerous North Atlantic climate records from the Holocene. Several mechanisms have been discussed as possible triggers for these climate shifts persisting decades to centuries. Here, we describe two abrupt cold events that occurred during an orbitally forced...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:f78168f3f5cc43fdb3ee629efe3648d1 2023-05-15T16:29:39+02:00 Abrupt cold events in the North Atlantic Ocean in a transient Holocene simulation A. Klus M. Prange V. Varma L. B. Tremblay M. Schulz 2018-08-01 https://doi.org/10.5194/cp-14-1165-2018 https://www.clim-past.net/14/1165/2018/cp-14-1165-2018.pdf https://doaj.org/article/f78168f3f5cc43fdb3ee629efe3648d1 en eng Copernicus Publications doi:10.5194/cp-14-1165-2018 1814-9324 1814-9332 https://www.clim-past.net/14/1165/2018/cp-14-1165-2018.pdf https://doaj.org/article/f78168f3f5cc43fdb3ee629efe3648d1 undefined Climate of the Past, Vol 14, Pp 1165-1178 (2018) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-14-1165-2018 2023-01-22T19:33:18Z Abrupt cold events have been detected in numerous North Atlantic climate records from the Holocene. Several mechanisms have been discussed as possible triggers for these climate shifts persisting decades to centuries. Here, we describe two abrupt cold events that occurred during an orbitally forced transient Holocene simulation using the Community Climate System Model version 3. Both events occurred during the late Holocene (4305–4267 BP and 3046–3018 BP for event 1 and event 2, respectively). They were characterized by substantial surface cooling (−2.3 and −1.8 °C, respectively) and freshening (−0.6 and −0.5 PSU, respectively) as well as severe sea ice advance east of Newfoundland and south of Greenland, reaching as far as the Iceland Basin in the northeastern Atlantic at the climaxes of the cold events. Convection and deep-water formation in the northwestern Atlantic collapsed during the events, while the Atlantic Meridional Overturning Circulation was not substantially affected (weakening by only about 10 % and 5 %, respectively). The events were triggered by prolonged phases of a positive North Atlantic Oscillation that caused substantial changes in the subpolar ocean circulation and associated freshwater transports, resulting in a weakening of the subpolar gyre. Our results suggest a possible mechanism by which abrupt cold events in the North Atlantic region may be triggered by internal climate variability without the need of an external (e.g., solar or volcanic) forcing. Article in Journal/Newspaper Greenland Iceland Newfoundland North Atlantic North Atlantic oscillation Sea ice Unknown Greenland Climate of the Past 14 8 1165 1178 |
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envir geo A. Klus M. Prange V. Varma L. B. Tremblay M. Schulz Abrupt cold events in the North Atlantic Ocean in a transient Holocene simulation |
topic_facet |
envir geo |
description |
Abrupt cold events have been detected in numerous North Atlantic climate records from the Holocene. Several mechanisms have been discussed as possible triggers for these climate shifts persisting decades to centuries. Here, we describe two abrupt cold events that occurred during an orbitally forced transient Holocene simulation using the Community Climate System Model version 3. Both events occurred during the late Holocene (4305–4267 BP and 3046–3018 BP for event 1 and event 2, respectively). They were characterized by substantial surface cooling (−2.3 and −1.8 °C, respectively) and freshening (−0.6 and −0.5 PSU, respectively) as well as severe sea ice advance east of Newfoundland and south of Greenland, reaching as far as the Iceland Basin in the northeastern Atlantic at the climaxes of the cold events. Convection and deep-water formation in the northwestern Atlantic collapsed during the events, while the Atlantic Meridional Overturning Circulation was not substantially affected (weakening by only about 10 % and 5 %, respectively). The events were triggered by prolonged phases of a positive North Atlantic Oscillation that caused substantial changes in the subpolar ocean circulation and associated freshwater transports, resulting in a weakening of the subpolar gyre. Our results suggest a possible mechanism by which abrupt cold events in the North Atlantic region may be triggered by internal climate variability without the need of an external (e.g., solar or volcanic) forcing. |
format |
Article in Journal/Newspaper |
author |
A. Klus M. Prange V. Varma L. B. Tremblay M. Schulz |
author_facet |
A. Klus M. Prange V. Varma L. B. Tremblay M. Schulz |
author_sort |
A. Klus |
title |
Abrupt cold events in the North Atlantic Ocean in a transient Holocene simulation |
title_short |
Abrupt cold events in the North Atlantic Ocean in a transient Holocene simulation |
title_full |
Abrupt cold events in the North Atlantic Ocean in a transient Holocene simulation |
title_fullStr |
Abrupt cold events in the North Atlantic Ocean in a transient Holocene simulation |
title_full_unstemmed |
Abrupt cold events in the North Atlantic Ocean in a transient Holocene simulation |
title_sort |
abrupt cold events in the north atlantic ocean in a transient holocene simulation |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-14-1165-2018 https://www.clim-past.net/14/1165/2018/cp-14-1165-2018.pdf https://doaj.org/article/f78168f3f5cc43fdb3ee629efe3648d1 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Iceland Newfoundland North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
Greenland Iceland Newfoundland North Atlantic North Atlantic oscillation Sea ice |
op_source |
Climate of the Past, Vol 14, Pp 1165-1178 (2018) |
op_relation |
doi:10.5194/cp-14-1165-2018 1814-9324 1814-9332 https://www.clim-past.net/14/1165/2018/cp-14-1165-2018.pdf https://doaj.org/article/f78168f3f5cc43fdb3ee629efe3648d1 |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-14-1165-2018 |
container_title |
Climate of the Past |
container_volume |
14 |
container_issue |
8 |
container_start_page |
1165 |
op_container_end_page |
1178 |
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