Diagnosing the Thickness‐Weighted Averaged Eddy‐Mean Flow Interaction From an Eddying North Atlantic Ensemble: The Eliassen‐Palm Flux
Abstract The thickness‐weighted average (TWA) framework, which treats the residual‐mean flow as the prognostic variable, provides a clear theoretical formulation of the eddy feedback onto the residual‐mean flow. The averaging operator involved in the TWA framework, although in theory being an ensemb...
Published in: | Journal of Advances in Modeling Earth Systems |
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American Geophysical Union (AGU)
2022
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ftdoajarticles:oai:doaj.org/article:ea4d967406d7423d9b15703a182333bc 2023-05-15T17:25:18+02:00 Diagnosing the Thickness‐Weighted Averaged Eddy‐Mean Flow Interaction From an Eddying North Atlantic Ensemble: The Eliassen‐Palm Flux Takaya Uchida Quentin Jamet William K. Dewar Julien Le Sommer Thierry Penduff Dhruv Balwada 2022-05-01T00:00:00Z https://doi.org/10.1029/2021MS002866 https://doaj.org/article/ea4d967406d7423d9b15703a182333bc EN eng American Geophysical Union (AGU) https://doi.org/10.1029/2021MS002866 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2021MS002866 https://doaj.org/article/ea4d967406d7423d9b15703a182333bc Journal of Advances in Modeling Earth Systems, Vol 14, Iss 5, Pp n/a-n/a (2022) ocean ensemble simulation eddy‐mean flow interaction Eliassen‐Palm flux Gulf Stream thickness‐weighted averaging Physical geography GB3-5030 Oceanography GC1-1581 article 2022 ftdoajarticles https://doi.org/10.1029/2021MS002866 2022-12-31T02:45:05Z Abstract The thickness‐weighted average (TWA) framework, which treats the residual‐mean flow as the prognostic variable, provides a clear theoretical formulation of the eddy feedback onto the residual‐mean flow. The averaging operator involved in the TWA framework, although in theory being an ensemble mean, in practice has often been approximated by a temporal mean. Here, we analyze an ensemble of North Atlantic simulations at mesoscale‐permitting resolution (1/12°). We therefore recognize means and eddies in terms of ensemble means and fluctuations about those means. The ensemble dimension being orthogonal to the temporal and spatial dimensions negates the necessity for an arbitrary temporal or spatial scale in defining the eddies. Eddy‐mean flow feedbacks are encapsulated in the Eliassen‐Palm (E‐P) flux tensor and its convergence indicates that eddy momentum fluxes dominate in the separated Gulf Stream. The eddies can be interpreted to contribute to the zonal meandering of the Gulf Stream and a northward migration of it in the meridional direction. Downstream of the separated Gulf Stream in the North Atlantic Current region, the interfacial form stress convergence becomes leading order in the E‐P flux convergence. Article in Journal/Newspaper north atlantic current North Atlantic Directory of Open Access Journals: DOAJ Articles Journal of Advances in Modeling Earth Systems 14 5 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
ocean ensemble simulation eddy‐mean flow interaction Eliassen‐Palm flux Gulf Stream thickness‐weighted averaging Physical geography GB3-5030 Oceanography GC1-1581 |
spellingShingle |
ocean ensemble simulation eddy‐mean flow interaction Eliassen‐Palm flux Gulf Stream thickness‐weighted averaging Physical geography GB3-5030 Oceanography GC1-1581 Takaya Uchida Quentin Jamet William K. Dewar Julien Le Sommer Thierry Penduff Dhruv Balwada Diagnosing the Thickness‐Weighted Averaged Eddy‐Mean Flow Interaction From an Eddying North Atlantic Ensemble: The Eliassen‐Palm Flux |
topic_facet |
ocean ensemble simulation eddy‐mean flow interaction Eliassen‐Palm flux Gulf Stream thickness‐weighted averaging Physical geography GB3-5030 Oceanography GC1-1581 |
description |
Abstract The thickness‐weighted average (TWA) framework, which treats the residual‐mean flow as the prognostic variable, provides a clear theoretical formulation of the eddy feedback onto the residual‐mean flow. The averaging operator involved in the TWA framework, although in theory being an ensemble mean, in practice has often been approximated by a temporal mean. Here, we analyze an ensemble of North Atlantic simulations at mesoscale‐permitting resolution (1/12°). We therefore recognize means and eddies in terms of ensemble means and fluctuations about those means. The ensemble dimension being orthogonal to the temporal and spatial dimensions negates the necessity for an arbitrary temporal or spatial scale in defining the eddies. Eddy‐mean flow feedbacks are encapsulated in the Eliassen‐Palm (E‐P) flux tensor and its convergence indicates that eddy momentum fluxes dominate in the separated Gulf Stream. The eddies can be interpreted to contribute to the zonal meandering of the Gulf Stream and a northward migration of it in the meridional direction. Downstream of the separated Gulf Stream in the North Atlantic Current region, the interfacial form stress convergence becomes leading order in the E‐P flux convergence. |
format |
Article in Journal/Newspaper |
author |
Takaya Uchida Quentin Jamet William K. Dewar Julien Le Sommer Thierry Penduff Dhruv Balwada |
author_facet |
Takaya Uchida Quentin Jamet William K. Dewar Julien Le Sommer Thierry Penduff Dhruv Balwada |
author_sort |
Takaya Uchida |
title |
Diagnosing the Thickness‐Weighted Averaged Eddy‐Mean Flow Interaction From an Eddying North Atlantic Ensemble: The Eliassen‐Palm Flux |
title_short |
Diagnosing the Thickness‐Weighted Averaged Eddy‐Mean Flow Interaction From an Eddying North Atlantic Ensemble: The Eliassen‐Palm Flux |
title_full |
Diagnosing the Thickness‐Weighted Averaged Eddy‐Mean Flow Interaction From an Eddying North Atlantic Ensemble: The Eliassen‐Palm Flux |
title_fullStr |
Diagnosing the Thickness‐Weighted Averaged Eddy‐Mean Flow Interaction From an Eddying North Atlantic Ensemble: The Eliassen‐Palm Flux |
title_full_unstemmed |
Diagnosing the Thickness‐Weighted Averaged Eddy‐Mean Flow Interaction From an Eddying North Atlantic Ensemble: The Eliassen‐Palm Flux |
title_sort |
diagnosing the thickness‐weighted averaged eddy‐mean flow interaction from an eddying north atlantic ensemble: the eliassen‐palm flux |
publisher |
American Geophysical Union (AGU) |
publishDate |
2022 |
url |
https://doi.org/10.1029/2021MS002866 https://doaj.org/article/ea4d967406d7423d9b15703a182333bc |
genre |
north atlantic current North Atlantic |
genre_facet |
north atlantic current North Atlantic |
op_source |
Journal of Advances in Modeling Earth Systems, Vol 14, Iss 5, Pp n/a-n/a (2022) |
op_relation |
https://doi.org/10.1029/2021MS002866 https://doaj.org/toc/1942-2466 1942-2466 doi:10.1029/2021MS002866 https://doaj.org/article/ea4d967406d7423d9b15703a182333bc |
op_doi |
https://doi.org/10.1029/2021MS002866 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
14 |
container_issue |
5 |
_version_ |
1766116700097347584 |