A Kinematic Kinetic Energy Backscatter Parametrization : from Implementation to Global Ocean Simulations
Ocean models at eddy-permitting resolution are generally overdissipative, damping the intensity of the mesoscale eddy field. To reduce overdissipation, we propose a simplified, kinematic energy backscatter parametrization built into the viscosity operator in conjunction with a new flow-dependent coe...
Published in: | Journal of Advances in Modeling Earth Systems |
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Online Access: | https://edoc.ku.de/id/eprint/30011/ https://doi.org/10.1029/2020MS002175 |
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ftueichstaett:oai:edoc.ku.de:30011 2024-02-11T10:08:32+01:00 A Kinematic Kinetic Energy Backscatter Parametrization : from Implementation to Global Ocean Simulations Juricke, Stephan Danilov, Sergey Koldunov, Nikolay Oliver, Marcel Sein, Dmitry Sidorenko, Dmitry Wang, Qiang 2020 https://edoc.ku.de/id/eprint/30011/ https://doi.org/10.1029/2020MS002175 eng eng Wiley-Blackwell Juricke, Stephan Danilov, Sergey Koldunov, Nikolay Oliver, Marcel <https://fordoc.ku.de/id/eprint/3157> Sein, Dmitry Sidorenko, Dmitry Wang, Qiang: A Kinematic Kinetic Energy Backscatter Parametrization : from Implementation to Global Ocean Simulations. In: Journal of advances in modeling earth systems : JAMES. 12 (2020) 12: e2020MS002175. - 20 S. ISSN 1942-2466 10.1029/2020MS002175 (Peer-Review-Journal) Artikel 2020 ftueichstaett https://doi.org/10.1029/2020MS002175 2024-01-22T23:17:32Z Ocean models at eddy-permitting resolution are generally overdissipative, damping the intensity of the mesoscale eddy field. To reduce overdissipation, we propose a simplified, kinematic energy backscatter parametrization built into the viscosity operator in conjunction with a new flow-dependent coefficient of viscosity based on nearest neighbor velocity differences. The new scheme mitigates excessive dissipation of energy and improves global ocean simulations at eddy-permitting resolution. We find that kinematic backscatter substantially raises simulated eddy kinetic energy, similar to an alternative, previously proposed dynamic backscatter parametrization. While dynamic backscatter is scale-aware and energetically more consistent, its implementation is more complex. Furthermore, it turns out to be computationally more expensive, as it applies, among other things, an additional prognostic subgrid energy equation. The kinematic backscatter proposed here, by contrast, comes at no additional computational cost, following the principle of simplicity. Our primary focus is the discretization on triangular unstructured meshes with cell placement of velocities (an analog of B-grids), as employed by the Finite-volumE Sea ice-Ocean Model (FESOM2). The kinematic backscatter scheme with the new viscosity coefficient is implemented in FESOM2 and tested in the simplified geometry of a zonally reentrant channel as well as in a global ocean simulation on a 1/4° mesh. This first version of the new kinematic backscatter needs to be tuned to the specific resolution regime of the simulation. However, the tuning relies on a single parameter, emphasizing the overall practicality of the approach. Article in Journal/Newspaper Sea ice KU.edoc - Publikationsserver der Katholischen Universität Eichstätt-Ingolstadt Journal of Advances in Modeling Earth Systems 12 12 |
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Open Polar |
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KU.edoc - Publikationsserver der Katholischen Universität Eichstätt-Ingolstadt |
op_collection_id |
ftueichstaett |
language |
English |
description |
Ocean models at eddy-permitting resolution are generally overdissipative, damping the intensity of the mesoscale eddy field. To reduce overdissipation, we propose a simplified, kinematic energy backscatter parametrization built into the viscosity operator in conjunction with a new flow-dependent coefficient of viscosity based on nearest neighbor velocity differences. The new scheme mitigates excessive dissipation of energy and improves global ocean simulations at eddy-permitting resolution. We find that kinematic backscatter substantially raises simulated eddy kinetic energy, similar to an alternative, previously proposed dynamic backscatter parametrization. While dynamic backscatter is scale-aware and energetically more consistent, its implementation is more complex. Furthermore, it turns out to be computationally more expensive, as it applies, among other things, an additional prognostic subgrid energy equation. The kinematic backscatter proposed here, by contrast, comes at no additional computational cost, following the principle of simplicity. Our primary focus is the discretization on triangular unstructured meshes with cell placement of velocities (an analog of B-grids), as employed by the Finite-volumE Sea ice-Ocean Model (FESOM2). The kinematic backscatter scheme with the new viscosity coefficient is implemented in FESOM2 and tested in the simplified geometry of a zonally reentrant channel as well as in a global ocean simulation on a 1/4° mesh. This first version of the new kinematic backscatter needs to be tuned to the specific resolution regime of the simulation. However, the tuning relies on a single parameter, emphasizing the overall practicality of the approach. |
format |
Article in Journal/Newspaper |
author |
Juricke, Stephan Danilov, Sergey Koldunov, Nikolay Oliver, Marcel Sein, Dmitry Sidorenko, Dmitry Wang, Qiang |
spellingShingle |
Juricke, Stephan Danilov, Sergey Koldunov, Nikolay Oliver, Marcel Sein, Dmitry Sidorenko, Dmitry Wang, Qiang A Kinematic Kinetic Energy Backscatter Parametrization : from Implementation to Global Ocean Simulations |
author_facet |
Juricke, Stephan Danilov, Sergey Koldunov, Nikolay Oliver, Marcel Sein, Dmitry Sidorenko, Dmitry Wang, Qiang |
author_sort |
Juricke, Stephan |
title |
A Kinematic Kinetic Energy Backscatter Parametrization : from Implementation to Global Ocean Simulations |
title_short |
A Kinematic Kinetic Energy Backscatter Parametrization : from Implementation to Global Ocean Simulations |
title_full |
A Kinematic Kinetic Energy Backscatter Parametrization : from Implementation to Global Ocean Simulations |
title_fullStr |
A Kinematic Kinetic Energy Backscatter Parametrization : from Implementation to Global Ocean Simulations |
title_full_unstemmed |
A Kinematic Kinetic Energy Backscatter Parametrization : from Implementation to Global Ocean Simulations |
title_sort |
kinematic kinetic energy backscatter parametrization : from implementation to global ocean simulations |
publisher |
Wiley-Blackwell |
publishDate |
2020 |
url |
https://edoc.ku.de/id/eprint/30011/ https://doi.org/10.1029/2020MS002175 |
genre |
Sea ice |
genre_facet |
Sea ice |
op_relation |
Juricke, Stephan Danilov, Sergey Koldunov, Nikolay Oliver, Marcel <https://fordoc.ku.de/id/eprint/3157> Sein, Dmitry Sidorenko, Dmitry Wang, Qiang: A Kinematic Kinetic Energy Backscatter Parametrization : from Implementation to Global Ocean Simulations. In: Journal of advances in modeling earth systems : JAMES. 12 (2020) 12: e2020MS002175. - 20 S. ISSN 1942-2466 10.1029/2020MS002175 (Peer-Review-Journal) |
op_doi |
https://doi.org/10.1029/2020MS002175 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
12 |
container_issue |
12 |
_version_ |
1790607921797660672 |