Causes of interannual-decadal variability in the meridional overturning circulation of the mid-latitude North Atlantic Ocean
The causes and characteristics of interannual to decadal variability of the meridional overturning circulation (MOC) in the North Atlantic are investigated with a suite of basin-scale ocean models (FLAME) and global ocean-ice models (ORCA) varying in resolution from medium- to eddy-resolving (1/2° –...
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ftnerc:oai:nora.nerc.ac.uk:164312 2023-05-15T17:29:00+02:00 Causes of interannual-decadal variability in the meridional overturning circulation of the mid-latitude North Atlantic Ocean Biastoch, Arne Böning, Claus W. Getzlaff, Julia Molines, Jean-Marc Madec, Gurvan 2008-12 http://nora.nerc.ac.uk/id/eprint/164312/ http://ams.allenpress.com/perlserv/?request=get-abstract&doi=10.1175%2F2008JCLI2404.1 https://doi.org/10.1175/2008JCLI2404.1 unknown Biastoch, Arne; Böning, Claus W.; Getzlaff, Julia; Molines, Jean-Marc; Madec, Gurvan. 2008 Causes of interannual-decadal variability in the meridional overturning circulation of the mid-latitude North Atlantic Ocean. Journal of Climate, 21 (24). 6599-6615. https://doi.org/10.1175/2008JCLI2404.1 <https://doi.org/10.1175/2008JCLI2404.1> Publication - Article PeerReviewed 2008 ftnerc https://doi.org/10.1175/2008JCLI2404.1 2023-02-04T19:35:21Z The causes and characteristics of interannual to decadal variability of the meridional overturning circulation (MOC) in the North Atlantic are investigated with a suite of basin-scale ocean models (FLAME) and global ocean-ice models (ORCA) varying in resolution from medium- to eddy-resolving (1/2° – 1/12°), using various forcing configurations built on bulk formulations invoking atmospheric reanalysis products. Comparison of the model hindcasts indicates similar MOC variability characteristics on time scales up to a decade; both model architectures also simulate an upward trend in MOC strength between the early 1970s and mid-1990s. The causes of the MOC changes are examined by perturbation experiments aimed selectively at the response to individual forcing components. The solutions emphasize an inherently linear character of the mid-latitude MOC variability by demonstrating that the anomalies of a (non eddy-resolving) hind-cast simulation can be understood as a superposition of decadal and longer-term signals originating from thermohaline forcing variability, and a higher-frequency wind-driven variability. The thermohaline MOC signal is linked to the variability in subarctic deep water formation, and rapidly progressing to the tropical Atlantic. However, throughout the subtropical and mid-latitude North Atlantic this signal is effectively masked by stronger MOC variability related to wind forcing and, especially north of 30–35° N, by internally-induced (eddy) fluctuations. Article in Journal/Newspaper North Atlantic Orca Subarctic Natural Environment Research Council: NERC Open Research Archive Journal of Climate 21 24 6599 6615 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
unknown |
description |
The causes and characteristics of interannual to decadal variability of the meridional overturning circulation (MOC) in the North Atlantic are investigated with a suite of basin-scale ocean models (FLAME) and global ocean-ice models (ORCA) varying in resolution from medium- to eddy-resolving (1/2° – 1/12°), using various forcing configurations built on bulk formulations invoking atmospheric reanalysis products. Comparison of the model hindcasts indicates similar MOC variability characteristics on time scales up to a decade; both model architectures also simulate an upward trend in MOC strength between the early 1970s and mid-1990s. The causes of the MOC changes are examined by perturbation experiments aimed selectively at the response to individual forcing components. The solutions emphasize an inherently linear character of the mid-latitude MOC variability by demonstrating that the anomalies of a (non eddy-resolving) hind-cast simulation can be understood as a superposition of decadal and longer-term signals originating from thermohaline forcing variability, and a higher-frequency wind-driven variability. The thermohaline MOC signal is linked to the variability in subarctic deep water formation, and rapidly progressing to the tropical Atlantic. However, throughout the subtropical and mid-latitude North Atlantic this signal is effectively masked by stronger MOC variability related to wind forcing and, especially north of 30–35° N, by internally-induced (eddy) fluctuations. |
format |
Article in Journal/Newspaper |
author |
Biastoch, Arne Böning, Claus W. Getzlaff, Julia Molines, Jean-Marc Madec, Gurvan |
spellingShingle |
Biastoch, Arne Böning, Claus W. Getzlaff, Julia Molines, Jean-Marc Madec, Gurvan Causes of interannual-decadal variability in the meridional overturning circulation of the mid-latitude North Atlantic Ocean |
author_facet |
Biastoch, Arne Böning, Claus W. Getzlaff, Julia Molines, Jean-Marc Madec, Gurvan |
author_sort |
Biastoch, Arne |
title |
Causes of interannual-decadal variability in the meridional overturning circulation of the mid-latitude North Atlantic Ocean |
title_short |
Causes of interannual-decadal variability in the meridional overturning circulation of the mid-latitude North Atlantic Ocean |
title_full |
Causes of interannual-decadal variability in the meridional overturning circulation of the mid-latitude North Atlantic Ocean |
title_fullStr |
Causes of interannual-decadal variability in the meridional overturning circulation of the mid-latitude North Atlantic Ocean |
title_full_unstemmed |
Causes of interannual-decadal variability in the meridional overturning circulation of the mid-latitude North Atlantic Ocean |
title_sort |
causes of interannual-decadal variability in the meridional overturning circulation of the mid-latitude north atlantic ocean |
publishDate |
2008 |
url |
http://nora.nerc.ac.uk/id/eprint/164312/ http://ams.allenpress.com/perlserv/?request=get-abstract&doi=10.1175%2F2008JCLI2404.1 https://doi.org/10.1175/2008JCLI2404.1 |
genre |
North Atlantic Orca Subarctic |
genre_facet |
North Atlantic Orca Subarctic |
op_relation |
Biastoch, Arne; Böning, Claus W.; Getzlaff, Julia; Molines, Jean-Marc; Madec, Gurvan. 2008 Causes of interannual-decadal variability in the meridional overturning circulation of the mid-latitude North Atlantic Ocean. Journal of Climate, 21 (24). 6599-6615. https://doi.org/10.1175/2008JCLI2404.1 <https://doi.org/10.1175/2008JCLI2404.1> |
op_doi |
https://doi.org/10.1175/2008JCLI2404.1 |
container_title |
Journal of Climate |
container_volume |
21 |
container_issue |
24 |
container_start_page |
6599 |
op_container_end_page |
6615 |
_version_ |
1766122309907644416 |