Diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying North Atlantic ensemble
International audience The analysis of eddy-mean flow interaction provides key insights into the structures and dynamics of inhomogeneous and anisotropic flows such as atmospheric and oceanic jets. As the divergence of Eliassen-Palm (E-P) flux formally encapsulates the interaction, the community has...
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ftinsu:oai:HAL:hal-04550005v1 2024-10-06T13:51:03+00:00 Diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying North Atlantic ensemble Uchida, Takaya Jamet, Quentin Dewar, William Le Sommer, Julien Penduff, Thierry Balwada, Dhruv Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Observatoire des Sciences de l'Univers de Grenoble (Fédération OSUG)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP) Université Grenoble Alpes (UGA) Vienne, Austria 2022-05 https://hal.science/hal-04550005 https://doi.org/10.5194/egusphere-egu22-770 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu22-770 EGU General Assembly https://hal.science/hal-04550005 EGU General Assembly, May 2022, Vienne, Austria. ⟨10.5194/egusphere-egu22-770⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/conferenceObject Conference papers 2022 ftinsu https://doi.org/10.5194/egusphere-egu22-770 2024-09-26T15:02:33Z International audience The analysis of eddy-mean flow interaction provides key insights into the structures and dynamics of inhomogeneous and anisotropic flows such as atmospheric and oceanic jets. As the divergence of Eliassen-Palm (E-P) flux formally encapsulates the interaction, the community has had a long-standing interest in accurately diagnosing this term. Here, we revisit the E-P flux divergence with an emphasis on the Gulf Stream, using a 48-member, eddy-rich (1/12°) ensemble of the North Atlantic ocean partially coupled to identical atmospheric states amongst all members via an atmospheric boundary layer model. This dataset allows for an unique decomposition where we define the mean flow as the ensemble mean, and interpret it as the oceanic response to the atmospheric state. The eddies are subsequently defined as fluctuations about the ensemble mean. Our results highlight two points: i) the implementation of the Thickness-Weighted Averaged (TWA) framework for a realistic ocean simulation in diagnosing the E-P flux divergence, and ii) validity of the ergodic assumption where one treats the temporal mean equivalent to the ensemble mean, which is questionable for a temporally varying system such as the ocean and climate. Conference Object North Atlantic Institut national des sciences de l'Univers: HAL-INSU |
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Institut national des sciences de l'Univers: HAL-INSU |
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English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
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[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Uchida, Takaya Jamet, Quentin Dewar, William Le Sommer, Julien Penduff, Thierry Balwada, Dhruv Diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying North Atlantic ensemble |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The analysis of eddy-mean flow interaction provides key insights into the structures and dynamics of inhomogeneous and anisotropic flows such as atmospheric and oceanic jets. As the divergence of Eliassen-Palm (E-P) flux formally encapsulates the interaction, the community has had a long-standing interest in accurately diagnosing this term. Here, we revisit the E-P flux divergence with an emphasis on the Gulf Stream, using a 48-member, eddy-rich (1/12°) ensemble of the North Atlantic ocean partially coupled to identical atmospheric states amongst all members via an atmospheric boundary layer model. This dataset allows for an unique decomposition where we define the mean flow as the ensemble mean, and interpret it as the oceanic response to the atmospheric state. The eddies are subsequently defined as fluctuations about the ensemble mean. Our results highlight two points: i) the implementation of the Thickness-Weighted Averaged (TWA) framework for a realistic ocean simulation in diagnosing the E-P flux divergence, and ii) validity of the ergodic assumption where one treats the temporal mean equivalent to the ensemble mean, which is questionable for a temporally varying system such as the ocean and climate. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Observatoire des Sciences de l'Univers de Grenoble (Fédération OSUG)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP) Université Grenoble Alpes (UGA) |
format |
Conference Object |
author |
Uchida, Takaya Jamet, Quentin Dewar, William Le Sommer, Julien Penduff, Thierry Balwada, Dhruv |
author_facet |
Uchida, Takaya Jamet, Quentin Dewar, William Le Sommer, Julien Penduff, Thierry Balwada, Dhruv |
author_sort |
Uchida, Takaya |
title |
Diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying North Atlantic ensemble |
title_short |
Diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying North Atlantic ensemble |
title_full |
Diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying North Atlantic ensemble |
title_fullStr |
Diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying North Atlantic ensemble |
title_full_unstemmed |
Diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying North Atlantic ensemble |
title_sort |
diagnosing the thickness-weighted averaged eddy-mean flow interaction from an eddying north atlantic ensemble |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.science/hal-04550005 https://doi.org/10.5194/egusphere-egu22-770 |
op_coverage |
Vienne, Austria |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
EGU General Assembly https://hal.science/hal-04550005 EGU General Assembly, May 2022, Vienne, Austria. ⟨10.5194/egusphere-egu22-770⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/egusphere-egu22-770 |
op_doi |
https://doi.org/10.5194/egusphere-egu22-770 |
_version_ |
1812179192865882112 |