Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component
A wide range of statistical tools is used to investigate the decadal variability of the Atlantic Meridional Overturning Circulation (AMOC) and associated key variables in a climate model (CHIME, Coupled Hadley-Isopycnic Model Experiment), which features a novel ocean component. CHIME is as similar a...
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ftnerc:oai:nora.nerc.ac.uk:442786 2023-05-15T16:29:51+02:00 Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component Persechino, A. Marsh, R. Sinha, B. Megann, A.P. Blaker, A.T. New, A.L. 2012 http://nora.nerc.ac.uk/id/eprint/442786/ unknown Persechino, A.; Marsh, R.; Sinha, B.; Megann, A.P. orcid:0000-0003-0975-6317 Blaker, A.T. orcid:0000-0001-5454-0131 New, A.L. orcid:0000-0002-3159-8872 . 2012 Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component. Climate Dynamics, 39 (3-4). 1021-1042. https://doi.org/10.1007/s00382-012-1432-y <https://doi.org/10.1007/s00382-012-1432-y> Publication - Article PeerReviewed 2012 ftnerc https://doi.org/10.1007/s00382-012-1432-y 2023-02-04T19:36:05Z A wide range of statistical tools is used to investigate the decadal variability of the Atlantic Meridional Overturning Circulation (AMOC) and associated key variables in a climate model (CHIME, Coupled Hadley-Isopycnic Model Experiment), which features a novel ocean component. CHIME is as similar as possible to the 3rd Hadley Centre Coupled Model (HadCM3) with the important exception that its ocean component is based on a hybrid vertical coordinate. Power spectral analysis reveals enhanced AMOC variability for periods in the range 15–30 years. Strong AMOC conditions are associated with: (1) a Sea Surface Temperature (SST) anomaly pattern reminiscent of the Atlantic Multi-decadal Oscillation (AMO) response, but associated with variations in a northern tropical-subtropical gradient; (2) a Surface Air Temperature anomaly pattern closely linked to SST; (3) a positive North Atlantic Oscillation (NAO)-like pattern; (4) a northward shift of the Intertropical Convergence Zone. The primary mode of AMOC variability is associated with decadal changes in the Labrador Sea and the Greenland Iceland Norwegian (GIN) Seas, in both cases linked to the tropical activity about 15 years earlier. These decadal changes are controlled by the low-frequency NAO that may be associated with a rapid atmospheric teleconnection from the tropics to the extratropics. Poleward advection of salinity anomalies in the mixed layer also leads to AMOC changes that are linked to processes in the Labrador Sea. A secondary mode of AMOC variability is associated with interannual changes in the Labrador and GIN Seas, through the impact of the NAO on local surface density. Article in Journal/Newspaper Greenland Iceland Labrador Sea North Atlantic North Atlantic oscillation Natural Environment Research Council: NERC Open Research Archive Greenland Climate Dynamics 39 3-4 1021 1042 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
A wide range of statistical tools is used to investigate the decadal variability of the Atlantic Meridional Overturning Circulation (AMOC) and associated key variables in a climate model (CHIME, Coupled Hadley-Isopycnic Model Experiment), which features a novel ocean component. CHIME is as similar as possible to the 3rd Hadley Centre Coupled Model (HadCM3) with the important exception that its ocean component is based on a hybrid vertical coordinate. Power spectral analysis reveals enhanced AMOC variability for periods in the range 15–30 years. Strong AMOC conditions are associated with: (1) a Sea Surface Temperature (SST) anomaly pattern reminiscent of the Atlantic Multi-decadal Oscillation (AMO) response, but associated with variations in a northern tropical-subtropical gradient; (2) a Surface Air Temperature anomaly pattern closely linked to SST; (3) a positive North Atlantic Oscillation (NAO)-like pattern; (4) a northward shift of the Intertropical Convergence Zone. The primary mode of AMOC variability is associated with decadal changes in the Labrador Sea and the Greenland Iceland Norwegian (GIN) Seas, in both cases linked to the tropical activity about 15 years earlier. These decadal changes are controlled by the low-frequency NAO that may be associated with a rapid atmospheric teleconnection from the tropics to the extratropics. Poleward advection of salinity anomalies in the mixed layer also leads to AMOC changes that are linked to processes in the Labrador Sea. A secondary mode of AMOC variability is associated with interannual changes in the Labrador and GIN Seas, through the impact of the NAO on local surface density. |
format |
Article in Journal/Newspaper |
author |
Persechino, A. Marsh, R. Sinha, B. Megann, A.P. Blaker, A.T. New, A.L. |
spellingShingle |
Persechino, A. Marsh, R. Sinha, B. Megann, A.P. Blaker, A.T. New, A.L. Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component |
author_facet |
Persechino, A. Marsh, R. Sinha, B. Megann, A.P. Blaker, A.T. New, A.L. |
author_sort |
Persechino, A. |
title |
Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component |
title_short |
Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component |
title_full |
Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component |
title_fullStr |
Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component |
title_full_unstemmed |
Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component |
title_sort |
decadal-timescale changes of the atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component |
publishDate |
2012 |
url |
http://nora.nerc.ac.uk/id/eprint/442786/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Iceland Labrador Sea North Atlantic North Atlantic oscillation |
genre_facet |
Greenland Iceland Labrador Sea North Atlantic North Atlantic oscillation |
op_relation |
Persechino, A.; Marsh, R.; Sinha, B.; Megann, A.P. orcid:0000-0003-0975-6317 Blaker, A.T. orcid:0000-0001-5454-0131 New, A.L. orcid:0000-0002-3159-8872 . 2012 Decadal-timescale changes of the Atlantic overturning circulation and climate in a coupled climate model with a hybrid-coordinate ocean component. Climate Dynamics, 39 (3-4). 1021-1042. https://doi.org/10.1007/s00382-012-1432-y <https://doi.org/10.1007/s00382-012-1432-y> |
op_doi |
https://doi.org/10.1007/s00382-012-1432-y |
container_title |
Climate Dynamics |
container_volume |
39 |
container_issue |
3-4 |
container_start_page |
1021 |
op_container_end_page |
1042 |
_version_ |
1766019559320453120 |