Data-driven eddy closure for oceanic eastward jets
Closed parameterizations (aka turbulence closures) are needed for representing the effects of unresolved oceanic mesoscale eddies in non-eddy-resolving and eddy-permitting oceanic general circulation models, such as those used for climate modeling studies. One of the most significant difficulties fo...
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Frontiers Media S.A.
2025-07-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2025.1623219/full |
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| author | Pavel Berloff Pavel Berloff Igor Shevchenko |
| author_facet | Pavel Berloff Pavel Berloff Igor Shevchenko |
| author_sort | Pavel Berloff |
| collection | DOAJ |
| description | Closed parameterizations (aka turbulence closures) are needed for representing the effects of unresolved oceanic mesoscale eddies in non-eddy-resolving and eddy-permitting oceanic general circulation models, such as those used for climate modeling studies. One of the most significant difficulties for parameterizing eddy effects is eddy backscatter, which largely maintains eastward jet extensions of the western-boundary currents and their adjacent recirculation zones. In this paper, we focus on the classical wind-driven, quasigeostrophic double-gyre ocean dynamics and propose and test a novel data-driven eddy closure. For this, the eddy effects are defined as the coarse-grid model errors arising from the approximation of the given eddy-resolving reference solution containing an energetic and coherent eastward jet. Without the eddy effects being taken into account, the coarse-grid non-eddy-resolving version of the model yields no eastward jet at all. These missing eddy effects are restored approximately by the implemented eddy closure that interactively corrects the dynamically resolved potential vorticity field. The closure is data-driven because it utilizes some important information about the actual eddies in the reference solution, which is treated as a substitute for the oceanic observational data. The systematically assessed closure skills are significant because the eddy-parameterized solutions qualitatively correctly recover the eastward jet, which is completely missed otherwise. First, our results serve as a proof of concept for implementing a closure extension into the primitive equations, which are used routinely in comprehensive oceanic general circulation models. Second, our results emphasize the fundamental importance of representing the key eddy/large-scale correlations by any parameterization of the eastward jet eddy backscatter. |
| format | Article |
| id | doaj-art-7e1fa52211984c2d809343d029404bb3 |
| institution | Kabale University |
| issn | 2296-7745 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj-art-7e1fa52211984c2d809343d029404bb32025-08-20T03:56:17ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452025-07-011210.3389/fmars.2025.16232191623219Data-driven eddy closure for oceanic eastward jetsPavel Berloff0Pavel Berloff1Igor Shevchenko2Department of Mathematics, Imperial College London, London, United KingdomInstitute of Numerical Mathematics, Russian Academy of Sciences, Moscow, RussiaDepartment of Mathematics, Imperial College London, London, United KingdomClosed parameterizations (aka turbulence closures) are needed for representing the effects of unresolved oceanic mesoscale eddies in non-eddy-resolving and eddy-permitting oceanic general circulation models, such as those used for climate modeling studies. One of the most significant difficulties for parameterizing eddy effects is eddy backscatter, which largely maintains eastward jet extensions of the western-boundary currents and their adjacent recirculation zones. In this paper, we focus on the classical wind-driven, quasigeostrophic double-gyre ocean dynamics and propose and test a novel data-driven eddy closure. For this, the eddy effects are defined as the coarse-grid model errors arising from the approximation of the given eddy-resolving reference solution containing an energetic and coherent eastward jet. Without the eddy effects being taken into account, the coarse-grid non-eddy-resolving version of the model yields no eastward jet at all. These missing eddy effects are restored approximately by the implemented eddy closure that interactively corrects the dynamically resolved potential vorticity field. The closure is data-driven because it utilizes some important information about the actual eddies in the reference solution, which is treated as a substitute for the oceanic observational data. The systematically assessed closure skills are significant because the eddy-parameterized solutions qualitatively correctly recover the eastward jet, which is completely missed otherwise. First, our results serve as a proof of concept for implementing a closure extension into the primitive equations, which are used routinely in comprehensive oceanic general circulation models. Second, our results emphasize the fundamental importance of representing the key eddy/large-scale correlations by any parameterization of the eastward jet eddy backscatter.https://www.frontiersin.org/articles/10.3389/fmars.2025.1623219/fullmesocale oceanic eddiesparameterizationclosureocean modellingquasigeostrophic model |
| spellingShingle | Pavel Berloff Pavel Berloff Igor Shevchenko Data-driven eddy closure for oceanic eastward jets Frontiers in Marine Science mesocale oceanic eddies parameterization closure ocean modelling quasigeostrophic model |
| title | Data-driven eddy closure for oceanic eastward jets |
| title_full | Data-driven eddy closure for oceanic eastward jets |
| title_fullStr | Data-driven eddy closure for oceanic eastward jets |
| title_full_unstemmed | Data-driven eddy closure for oceanic eastward jets |
| title_short | Data-driven eddy closure for oceanic eastward jets |
| title_sort | data driven eddy closure for oceanic eastward jets |
| topic | mesocale oceanic eddies parameterization closure ocean modelling quasigeostrophic model |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2025.1623219/full |
| work_keys_str_mv | AT pavelberloff datadriveneddyclosureforoceaniceastwardjets AT pavelberloff datadriveneddyclosureforoceaniceastwardjets AT igorshevchenko datadriveneddyclosureforoceaniceastwardjets |