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The North Atlantic Ocean is in a state of reduced overturning

The North Atlantic Ocean is in a state of reduced overturning
The North Atlantic Ocean is in a state of reduced overturning
The Atlantic Meridional Overturning Circulation (AMOC) is responsible for a variable and climatically important northward transport of heat. Using data from an array of instruments that span the Atlantic at 26°N, we show that the AMOC has been in a state of reduced overturning since 2008 as compared to 2004-2008. This change of AMOC state is concurrent with other changes in the North Atlantic such as a northward shift and broadening of the Gulf Stream, and altered patterns of heat content and sea-surface temperature. These changes resemble the response to a declining AMOC predicted by coupled climate models. Concurrent changes in air-sea fluxes close to the western boundary reveal that the changes in ocean heat transport and SST have altered the pattern of ocean-atmosphere heat exchange over the North Atlantic. These results provide strong observational evidence that the AMOC is a major factor in decadal scale variability of North Atlantic climate.
0094-8276
1527-1533
Smeed, D.A.
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Josey, S.A.
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Beaulieu, C.
13ae2c11-ebfe-48d9-bda9-122cd013c021
Johns, W.E.
e09ba73d-f275-4ff3-a07c-dfb8f1622b21
Moat, B.I.
497dbb18-a98f-466b-b459-aa2c872ad2dc
Frajka-williams, E.
da86044e-0f68-4cc9-8f60-7fdbc4dc19cb
Rayner, D.
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Meinen, C. S.
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Baringer, M.O.
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Bryden, H.L.
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McCarthy, G.D.
fd87927d-feb3-447a-9cda-9558916df99f
Smeed, D.A.
704615ce-822d-4649-b59f-07c804ead99c
Josey, S.A.
2252ab7f-5cd2-49fd-a951-aece44553d93
Beaulieu, C.
13ae2c11-ebfe-48d9-bda9-122cd013c021
Johns, W.E.
e09ba73d-f275-4ff3-a07c-dfb8f1622b21
Moat, B.I.
497dbb18-a98f-466b-b459-aa2c872ad2dc
Frajka-williams, E.
da86044e-0f68-4cc9-8f60-7fdbc4dc19cb
Rayner, D.
60eaf35c-c54e-447b-8551-efc08637d122
Meinen, C. S.
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Baringer, M.O.
05e0f722-83ee-4dc2-ac6e-2505c8b29f31
Bryden, H.L.
7f823946-34e8-48a3-8bd4-a72d2d749184
McCarthy, G.D.
fd87927d-feb3-447a-9cda-9558916df99f

Smeed, D.A., Josey, S.A., Beaulieu, C., Johns, W.E., Moat, B.I., Frajka-williams, E., Rayner, D., Meinen, C. S., Baringer, M.O., Bryden, H.L. and McCarthy, G.D. (2018) The North Atlantic Ocean is in a state of reduced overturning. Geophysical Research Letters, 45 (3), 1527-1533. (doi:10.1002/2017GL076350).

Record type: Article

Abstract

The Atlantic Meridional Overturning Circulation (AMOC) is responsible for a variable and climatically important northward transport of heat. Using data from an array of instruments that span the Atlantic at 26°N, we show that the AMOC has been in a state of reduced overturning since 2008 as compared to 2004-2008. This change of AMOC state is concurrent with other changes in the North Atlantic such as a northward shift and broadening of the Gulf Stream, and altered patterns of heat content and sea-surface temperature. These changes resemble the response to a declining AMOC predicted by coupled climate models. Concurrent changes in air-sea fluxes close to the western boundary reveal that the changes in ocean heat transport and SST have altered the pattern of ocean-atmosphere heat exchange over the North Atlantic. These results provide strong observational evidence that the AMOC is a major factor in decadal scale variability of North Atlantic climate.

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Smeed_et_al-2018-Geophysical_Research_Letters - Accepted Manuscript
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Accepted/In Press date: 25 January 2018
e-pub ahead of print date: 29 January 2018
Published date: 16 February 2018

Identifiers

Local EPrints ID: 417591
URI: http://eprints.soton.ac.uk/id/eprint/417591
ISSN: 0094-8276
PURE UUID: f5e72b1d-f8c4-4754-9022-0bdcb8c173cb
ORCID for E. Frajka-williams: ORCID iD orcid.org/0000-0001-8773-7838
ORCID for H.L. Bryden: ORCID iD orcid.org/0000-0002-8216-6359

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Date deposited: 06 Feb 2018 17:30
Last modified: 28 Apr 2022 02:02

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Contributors

Author: D.A. Smeed
Author: S.A. Josey
Author: C. Beaulieu
Author: W.E. Johns
Author: B.I. Moat
Author: E. Frajka-williams ORCID iD
Author: D. Rayner
Author: C. S. Meinen
Author: M.O. Baringer
Author: H.L. Bryden ORCID iD
Author: G.D. McCarthy

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