A mechanism for Atlantic multidecadal variability in the Kiel Climate Model
Atlantic Multidecadal Variability (AMV) is investigated in a millennial control simulation with the Kiel Climate Model (KCM), a coupled atmosphere–ocean–sea ice model. An oscillatory mode with approximately 60 years period and characteristics similar to observations is identified with the aid of thr...
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ftoceanrep:oai:oceanrep.geomar.de:19943 2023-05-15T17:30:34+02:00 A mechanism for Atlantic multidecadal variability in the Kiel Climate Model Ba, Jin Keenlyside, Noel S. Park, Wonsun Latif, Mojib Hawkins, Ed Ding, Hui 2013 text https://oceanrep.geomar.de/id/eprint/19943/ https://oceanrep.geomar.de/id/eprint/19943/1/Ba.pdf https://doi.org/10.1007/s00382-012-1633-4 en eng Springer https://oceanrep.geomar.de/id/eprint/19943/1/Ba.pdf Ba, J., Keenlyside, N. S., Park, W. , Latif, M. , Hawkins, E. and Ding, H. (2013) A mechanism for Atlantic multidecadal variability in the Kiel Climate Model. Climate Dynamics, 41 (7-8). pp. 2133-2144. DOI 10.1007/s00382-012-1633-4 <https://doi.org/10.1007/s00382-012-1633-4>. doi:10.1007/s00382-012-1633-4 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2013 ftoceanrep https://doi.org/10.1007/s00382-012-1633-4 2023-04-07T15:07:20Z Atlantic Multidecadal Variability (AMV) is investigated in a millennial control simulation with the Kiel Climate Model (KCM), a coupled atmosphere–ocean–sea ice model. An oscillatory mode with approximately 60 years period and characteristics similar to observations is identified with the aid of three-dimensional temperature and salinity joint empirical orthogonal function analysis. The mode explains 30 % of variability on centennial and shorter timescales in the upper 2,000 m of the North Atlantic. It is associated with changes in the Atlantic Meridional Overturning Circulation (AMOC) of ±1–2 Sv and Atlantic Sea Surface Temperature (SST) of ±0.2 °C. AMV in KCM results from an out-of-phase interaction between horizontal and vertical ocean circulation, coupled through Irminger Sea convection. Wintertime convection in this region is mainly controlled by salinity anomalies transported by the Subpolar Gyre (SPG). Increased (decreased) dense water formation in this region leads to a stronger (weaker) AMOC after 15 years, and this in turn leads to a weaker (stronger) SPG after another 15 years. The key role of salinity variations in the subpolar North Atlantic for AMV is confirmed in a 1,000 year long simulation with salinity restored to model climatology: No low frequency variations in convection are simulated, and the 60 year mode of variability is absent. Article in Journal/Newspaper North Atlantic Sea ice OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Climate Dynamics 41 7-8 2133 2144 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Atlantic Multidecadal Variability (AMV) is investigated in a millennial control simulation with the Kiel Climate Model (KCM), a coupled atmosphere–ocean–sea ice model. An oscillatory mode with approximately 60 years period and characteristics similar to observations is identified with the aid of three-dimensional temperature and salinity joint empirical orthogonal function analysis. The mode explains 30 % of variability on centennial and shorter timescales in the upper 2,000 m of the North Atlantic. It is associated with changes in the Atlantic Meridional Overturning Circulation (AMOC) of ±1–2 Sv and Atlantic Sea Surface Temperature (SST) of ±0.2 °C. AMV in KCM results from an out-of-phase interaction between horizontal and vertical ocean circulation, coupled through Irminger Sea convection. Wintertime convection in this region is mainly controlled by salinity anomalies transported by the Subpolar Gyre (SPG). Increased (decreased) dense water formation in this region leads to a stronger (weaker) AMOC after 15 years, and this in turn leads to a weaker (stronger) SPG after another 15 years. The key role of salinity variations in the subpolar North Atlantic for AMV is confirmed in a 1,000 year long simulation with salinity restored to model climatology: No low frequency variations in convection are simulated, and the 60 year mode of variability is absent. |
format |
Article in Journal/Newspaper |
author |
Ba, Jin Keenlyside, Noel S. Park, Wonsun Latif, Mojib Hawkins, Ed Ding, Hui |
spellingShingle |
Ba, Jin Keenlyside, Noel S. Park, Wonsun Latif, Mojib Hawkins, Ed Ding, Hui A mechanism for Atlantic multidecadal variability in the Kiel Climate Model |
author_facet |
Ba, Jin Keenlyside, Noel S. Park, Wonsun Latif, Mojib Hawkins, Ed Ding, Hui |
author_sort |
Ba, Jin |
title |
A mechanism for Atlantic multidecadal variability in the Kiel Climate Model |
title_short |
A mechanism for Atlantic multidecadal variability in the Kiel Climate Model |
title_full |
A mechanism for Atlantic multidecadal variability in the Kiel Climate Model |
title_fullStr |
A mechanism for Atlantic multidecadal variability in the Kiel Climate Model |
title_full_unstemmed |
A mechanism for Atlantic multidecadal variability in the Kiel Climate Model |
title_sort |
mechanism for atlantic multidecadal variability in the kiel climate model |
publisher |
Springer |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/19943/ https://oceanrep.geomar.de/id/eprint/19943/1/Ba.pdf https://doi.org/10.1007/s00382-012-1633-4 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Irminger Sea |
geographic_facet |
Irminger Sea |
genre |
North Atlantic Sea ice |
genre_facet |
North Atlantic Sea ice |
op_relation |
https://oceanrep.geomar.de/id/eprint/19943/1/Ba.pdf Ba, J., Keenlyside, N. S., Park, W. , Latif, M. , Hawkins, E. and Ding, H. (2013) A mechanism for Atlantic multidecadal variability in the Kiel Climate Model. Climate Dynamics, 41 (7-8). pp. 2133-2144. DOI 10.1007/s00382-012-1633-4 <https://doi.org/10.1007/s00382-012-1633-4>. doi:10.1007/s00382-012-1633-4 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/s00382-012-1633-4 |
container_title |
Climate Dynamics |
container_volume |
41 |
container_issue |
7-8 |
container_start_page |
2133 |
op_container_end_page |
2144 |
_version_ |
1766127404210716672 |