Low-frequency oscillations of the Atlantic Ocean meridional overturning circulation in a coupled climate model
International audience Using a 3-dimensional climate model of intermediate complexity we show that the overturning circulation of the Atlantic Ocean can vary at multicentennial-to-millennial timescales for modern boundary conditions. A continuous freshwater perturbation in the Labrador Sea pushes th...
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ftinsu:oai:HAL:hal-00298067v1 2023-11-12T04:20:32+01:00 Low-frequency oscillations of the Atlantic Ocean meridional overturning circulation in a coupled climate model Schulz, M. Prange, M. Klocker, A. Department of Geosciences DFG Research Center "Ocean Margins" 2007-02-07 https://hal.science/hal-00298067 https://hal.science/hal-00298067/document https://hal.science/hal-00298067/file/cp-3-97-2007.pdf en eng HAL CCSD European Geosciences Union (EGU) hal-00298067 https://hal.science/hal-00298067 https://hal.science/hal-00298067/document https://hal.science/hal-00298067/file/cp-3-97-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-00298067 Climate of the Past, 2007, 3 (1), pp.97-107 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2007 ftinsu 2023-10-25T16:28:16Z International audience Using a 3-dimensional climate model of intermediate complexity we show that the overturning circulation of the Atlantic Ocean can vary at multicentennial-to-millennial timescales for modern boundary conditions. A continuous freshwater perturbation in the Labrador Sea pushes the overturning circulation of the Atlantic Ocean into a bi-stable regime, characterized by phases of active and inactive deep-water formation in the Labrador Sea. In contrast, deep-water formation in the Nordic Seas is active during all phases of the oscillations. The actual timing of the transitions between the two circulation states occurs randomly. The oscillations constitute a 3-dimensional phenomenon and have to be distinguished from low-frequency oscillations seen previously in 2-dimensional models of the ocean. A conceptual model provides further insight into the essential dynamics underlying the oscillations of the large-scale ocean circulation. The model experiments indicate that the coupled climate system can exhibit unforced climate variability at multicentennial-to-millennial timescales that may be of relevance for Holocene climate variations. Article in Journal/Newspaper Labrador Sea Nordic Seas Institut national des sciences de l'Univers: HAL-INSU |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Schulz, M. Prange, M. Klocker, A. Low-frequency oscillations of the Atlantic Ocean meridional overturning circulation in a coupled climate model |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Using a 3-dimensional climate model of intermediate complexity we show that the overturning circulation of the Atlantic Ocean can vary at multicentennial-to-millennial timescales for modern boundary conditions. A continuous freshwater perturbation in the Labrador Sea pushes the overturning circulation of the Atlantic Ocean into a bi-stable regime, characterized by phases of active and inactive deep-water formation in the Labrador Sea. In contrast, deep-water formation in the Nordic Seas is active during all phases of the oscillations. The actual timing of the transitions between the two circulation states occurs randomly. The oscillations constitute a 3-dimensional phenomenon and have to be distinguished from low-frequency oscillations seen previously in 2-dimensional models of the ocean. A conceptual model provides further insight into the essential dynamics underlying the oscillations of the large-scale ocean circulation. The model experiments indicate that the coupled climate system can exhibit unforced climate variability at multicentennial-to-millennial timescales that may be of relevance for Holocene climate variations. |
author2 |
Department of Geosciences DFG Research Center "Ocean Margins" |
format |
Article in Journal/Newspaper |
author |
Schulz, M. Prange, M. Klocker, A. |
author_facet |
Schulz, M. Prange, M. Klocker, A. |
author_sort |
Schulz, M. |
title |
Low-frequency oscillations of the Atlantic Ocean meridional overturning circulation in a coupled climate model |
title_short |
Low-frequency oscillations of the Atlantic Ocean meridional overturning circulation in a coupled climate model |
title_full |
Low-frequency oscillations of the Atlantic Ocean meridional overturning circulation in a coupled climate model |
title_fullStr |
Low-frequency oscillations of the Atlantic Ocean meridional overturning circulation in a coupled climate model |
title_full_unstemmed |
Low-frequency oscillations of the Atlantic Ocean meridional overturning circulation in a coupled climate model |
title_sort |
low-frequency oscillations of the atlantic ocean meridional overturning circulation in a coupled climate model |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://hal.science/hal-00298067 https://hal.science/hal-00298067/document https://hal.science/hal-00298067/file/cp-3-97-2007.pdf |
genre |
Labrador Sea Nordic Seas |
genre_facet |
Labrador Sea Nordic Seas |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-00298067 Climate of the Past, 2007, 3 (1), pp.97-107 |
op_relation |
hal-00298067 https://hal.science/hal-00298067 https://hal.science/hal-00298067/document https://hal.science/hal-00298067/file/cp-3-97-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782336433457987584 |