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Vertical structure of eddies and Rossby waves, and their effect on the Atlantic meridional overturning circulation at 26.5°N

Vertical structure of eddies and Rossby waves, and their effect on the Atlantic meridional overturning circulation at 26.5°N
Vertical structure of eddies and Rossby waves, and their effect on the Atlantic meridional overturning circulation at 26.5°N
The meridional overturning circulation (MOC) at inline image in the Atlantic has a standard deviation of 4.9 Sv and contains large fluctuations at subannual periods. The geostrophic component of the MOC is believed to be influenced on subannual time scales by eddies and Rossby waves. To quantify this effect, the vertical structure and surface characteristics of westward propagating signals are studied using altimetric data and full-depth mooring measurements from the RAPID array at inline image. Westward propagating features are observed in the western North Atlantic in both data sets and have periods of 80–250 days in the first baroclinic mode. These features are still observed by the RAPID moorings 20 km offshore of the western boundary. The western boundary also exhibits deep variability characterized by enhanced energy in higher baroclinic modes. The effect of eddies and Rossby waves on the geostrophic transport is quantified by representing their vertical structure with the first baroclinic mode. In total, 42% of the variance of the transbasin thermocline transport inferred from geostrophic calculations at inline image can be attributed to first mode variability, which is associated with eddies and Rossby waves at periods of 80–250 days. The standard deviation of the transbasin thermocline transport due to eddies and Rossby waves is estimated to be 2.6 Sv.
MOC, Eddies, Rossby waves, in situ observations
2169-9275
6479-6498
Clément, L.
597f945c-2292-4425-91dc-5178662c6ea5
Frajka-Williams, E.
da86044e-0f68-4cc9-8f60-7fdbc4dc19cb
Szuts, Z.B.
3de4fcbf-2647-4e51-be5f-a9fa1b2d0325
Cunningham, S.A.
cf4b95d7-742f-43bd-8b99-c64fe50241ae
Clément, L.
597f945c-2292-4425-91dc-5178662c6ea5
Frajka-Williams, E.
da86044e-0f68-4cc9-8f60-7fdbc4dc19cb
Szuts, Z.B.
3de4fcbf-2647-4e51-be5f-a9fa1b2d0325
Cunningham, S.A.
cf4b95d7-742f-43bd-8b99-c64fe50241ae

Clément, L., Frajka-Williams, E., Szuts, Z.B. and Cunningham, S.A. (2014) Vertical structure of eddies and Rossby waves, and their effect on the Atlantic meridional overturning circulation at 26.5°N. Journal of Geophysical Research: Oceans, 119 (9), 6479-6498. (doi:10.1002/2014JC010146).

Record type: Article

Abstract

The meridional overturning circulation (MOC) at inline image in the Atlantic has a standard deviation of 4.9 Sv and contains large fluctuations at subannual periods. The geostrophic component of the MOC is believed to be influenced on subannual time scales by eddies and Rossby waves. To quantify this effect, the vertical structure and surface characteristics of westward propagating signals are studied using altimetric data and full-depth mooring measurements from the RAPID array at inline image. Westward propagating features are observed in the western North Atlantic in both data sets and have periods of 80–250 days in the first baroclinic mode. These features are still observed by the RAPID moorings 20 km offshore of the western boundary. The western boundary also exhibits deep variability characterized by enhanced energy in higher baroclinic modes. The effect of eddies and Rossby waves on the geostrophic transport is quantified by representing their vertical structure with the first baroclinic mode. In total, 42% of the variance of the transbasin thermocline transport inferred from geostrophic calculations at inline image can be attributed to first mode variability, which is associated with eddies and Rossby waves at periods of 80–250 days. The standard deviation of the transbasin thermocline transport due to eddies and Rossby waves is estimated to be 2.6 Sv.

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2014_jgr_Clement_FrajkaWilliams_etal_Eddies_and_RossbyWaves_AMOC-finalpub.pdf - Version of Record
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e-pub ahead of print date: September 2014
Published date: September 2014
Keywords: MOC, Eddies, Rossby waves, in situ observations
Organisations: Physical Oceanography

Identifiers

Local EPrints ID: 369376
URI: http://eprints.soton.ac.uk/id/eprint/369376
ISSN: 2169-9275
PURE UUID: 5fd9bf38-81ba-41ff-a2b1-8a63fc3bb56c
ORCID for E. Frajka-Williams: ORCID iD orcid.org/0000-0001-8773-7838

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Date deposited: 25 Sep 2014 08:57
Last modified: 15 Mar 2024 03:35

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Contributors

Author: L. Clément
Author: E. Frajka-Williams ORCID iD
Author: Z.B. Szuts
Author: S.A. Cunningham

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