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 present-day boundary conditions. A weak and continuous freshwater input into the Labrador Sea...
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ftccsdartic:oai:HAL:hal-00298149v1 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" 2006-09-19 https://hal.science/hal-00298149 https://hal.science/hal-00298149/document https://hal.science/hal-00298149/file/cpd-2-801-2006.pdf en eng HAL CCSD European Geosciences Union (EGU) hal-00298149 https://hal.science/hal-00298149 https://hal.science/hal-00298149/document https://hal.science/hal-00298149/file/cpd-2-801-2006.pdf info:eu-repo/semantics/OpenAccess ISSN: 1814-9340 EISSN: 1814-9359 Climate of the Past Discussions https://hal.science/hal-00298149 Climate of the Past Discussions, 2006, 2 (5), pp.801-830 [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 2006 ftccsdartic 2023-10-21T23:15:24Z 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 present-day boundary conditions. A weak and continuous freshwater input into 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 and future climate variations. Article in Journal/Newspaper Labrador Sea Nordic Seas Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
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 present-day boundary conditions. A weak and continuous freshwater input into 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 and future 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 |
2006 |
url |
https://hal.science/hal-00298149 https://hal.science/hal-00298149/document https://hal.science/hal-00298149/file/cpd-2-801-2006.pdf |
genre |
Labrador Sea Nordic Seas |
genre_facet |
Labrador Sea Nordic Seas |
op_source |
ISSN: 1814-9340 EISSN: 1814-9359 Climate of the Past Discussions https://hal.science/hal-00298149 Climate of the Past Discussions, 2006, 2 (5), pp.801-830 |
op_relation |
hal-00298149 https://hal.science/hal-00298149 https://hal.science/hal-00298149/document https://hal.science/hal-00298149/file/cpd-2-801-2006.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782336433053237248 |