The Variability of the Atlantic Meridional Overturning Circulation, the North Atlantic Oscillation, and the El Niño–Southern Oscillation in the Bergen Climate Model
The link between the interannual to interdecadal variability of the Atlantic meridional overturning circulation (AMOC) and the atmospheric forcing is investigated using 200 yr of a control simulation of the Bergen Climate Model, where the mean circulation cell is rather realistic, as is also the loc...
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Online Access: | https://hal.archives-ouvertes.fr/hal-00122304 https://doi.org/10.1175/JCLI3405.1 |
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ftccsdartic:oai:HAL:hal-00122304v1 2023-05-15T16:29:56+02:00 The Variability of the Atlantic Meridional Overturning Circulation, the North Atlantic Oscillation, and the El Niño–Southern Oscillation in the Bergen Climate Model Mignot, Juliette Frankignoul, Claude Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Potsdam Institute for Climate Impact Research (PIK) 2005 https://hal.archives-ouvertes.fr/hal-00122304 https://doi.org/10.1175/JCLI3405.1 en eng HAL CCSD American Meteorological Society info:eu-repo/semantics/altIdentifier/doi/10.1175/JCLI3405.1 hal-00122304 https://hal.archives-ouvertes.fr/hal-00122304 doi:10.1175/JCLI3405.1 ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.archives-ouvertes.fr/hal-00122304 Journal of Climate, American Meteorological Society, 2005, 18 (13), pp.2361-2375. ⟨10.1175/JCLI3405.1⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2005 ftccsdartic https://doi.org/10.1175/JCLI3405.1 2020-12-26T18:54:12Z The link between the interannual to interdecadal variability of the Atlantic meridional overturning circulation (AMOC) and the atmospheric forcing is investigated using 200 yr of a control simulation of the Bergen Climate Model, where the mean circulation cell is rather realistic, as is also the location of deep convection in the northern North Atlantic. The AMOC variability has a slightly red frequency spectrum and is primarily forced by the atmosphere. The maximum value of the AMOC is mostly sensitive to the deep convection in the Irminger Sea, which it lags by about 5 yr. The latter is mostly forced by a succession of atmospheric patterns that induce anomalous northerly winds over the area. The impact of the North Atlantic Oscillation on deep convection in the Labrador and Greenland Seas is represented realistically, but its influence on the AMOC is limited to the interannual time scale and is primarily associated with wind forcing. The tropical Pacific shows a strong variability in the model, with too strong an influence on the North Atlantic. However, its influence on the tropical Atlantic is realistic. Based on lagged correlations and the release of fictitious Lagrangian drifters, the tropical Pacific seems to influence the AMOC with a time lag of about 40 yr. The mechanism is as follows: El Niño events induce positive sea surface salinity anomalies in the tropical Atlantic that are advected northward, circulate in the subtropical gyre, and then subduct. In the ocean interior, part of the salinity anomaly is advected along the North Atlantic current, eventually reaching the Irminger and Labrador Seas after about 35 yr where they destabilize the water column and favor deep convection. Article in Journal/Newspaper Greenland north atlantic current North Atlantic North Atlantic oscillation Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Greenland Pacific Bergen Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Journal of Climate 18 13 2361 2375 |
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.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Mignot, Juliette Frankignoul, Claude The Variability of the Atlantic Meridional Overturning Circulation, the North Atlantic Oscillation, and the El Niño–Southern Oscillation in the Bergen Climate Model |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
The link between the interannual to interdecadal variability of the Atlantic meridional overturning circulation (AMOC) and the atmospheric forcing is investigated using 200 yr of a control simulation of the Bergen Climate Model, where the mean circulation cell is rather realistic, as is also the location of deep convection in the northern North Atlantic. The AMOC variability has a slightly red frequency spectrum and is primarily forced by the atmosphere. The maximum value of the AMOC is mostly sensitive to the deep convection in the Irminger Sea, which it lags by about 5 yr. The latter is mostly forced by a succession of atmospheric patterns that induce anomalous northerly winds over the area. The impact of the North Atlantic Oscillation on deep convection in the Labrador and Greenland Seas is represented realistically, but its influence on the AMOC is limited to the interannual time scale and is primarily associated with wind forcing. The tropical Pacific shows a strong variability in the model, with too strong an influence on the North Atlantic. However, its influence on the tropical Atlantic is realistic. Based on lagged correlations and the release of fictitious Lagrangian drifters, the tropical Pacific seems to influence the AMOC with a time lag of about 40 yr. The mechanism is as follows: El Niño events induce positive sea surface salinity anomalies in the tropical Atlantic that are advected northward, circulate in the subtropical gyre, and then subduct. In the ocean interior, part of the salinity anomaly is advected along the North Atlantic current, eventually reaching the Irminger and Labrador Seas after about 35 yr where they destabilize the water column and favor deep convection. |
author2 |
Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Potsdam Institute for Climate Impact Research (PIK) |
format |
Article in Journal/Newspaper |
author |
Mignot, Juliette Frankignoul, Claude |
author_facet |
Mignot, Juliette Frankignoul, Claude |
author_sort |
Mignot, Juliette |
title |
The Variability of the Atlantic Meridional Overturning Circulation, the North Atlantic Oscillation, and the El Niño–Southern Oscillation in the Bergen Climate Model |
title_short |
The Variability of the Atlantic Meridional Overturning Circulation, the North Atlantic Oscillation, and the El Niño–Southern Oscillation in the Bergen Climate Model |
title_full |
The Variability of the Atlantic Meridional Overturning Circulation, the North Atlantic Oscillation, and the El Niño–Southern Oscillation in the Bergen Climate Model |
title_fullStr |
The Variability of the Atlantic Meridional Overturning Circulation, the North Atlantic Oscillation, and the El Niño–Southern Oscillation in the Bergen Climate Model |
title_full_unstemmed |
The Variability of the Atlantic Meridional Overturning Circulation, the North Atlantic Oscillation, and the El Niño–Southern Oscillation in the Bergen Climate Model |
title_sort |
variability of the atlantic meridional overturning circulation, the north atlantic oscillation, and the el niño–southern oscillation in the bergen climate model |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.archives-ouvertes.fr/hal-00122304 https://doi.org/10.1175/JCLI3405.1 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Greenland Pacific Bergen Irminger Sea |
geographic_facet |
Greenland Pacific Bergen Irminger Sea |
genre |
Greenland north atlantic current North Atlantic North Atlantic oscillation |
genre_facet |
Greenland north atlantic current North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0894-8755 EISSN: 1520-0442 Journal of Climate https://hal.archives-ouvertes.fr/hal-00122304 Journal of Climate, American Meteorological Society, 2005, 18 (13), pp.2361-2375. ⟨10.1175/JCLI3405.1⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1175/JCLI3405.1 hal-00122304 https://hal.archives-ouvertes.fr/hal-00122304 doi:10.1175/JCLI3405.1 |
op_doi |
https://doi.org/10.1175/JCLI3405.1 |
container_title |
Journal of Climate |
container_volume |
18 |
container_issue |
13 |
container_start_page |
2361 |
op_container_end_page |
2375 |
_version_ |
1766019643957313536 |