Sensitivity study of energy transfer between mesoscale eddies and wind-induced near-inertial oscillations
<p>Analyses of current observations and numerical simulations at two moorings in the northern South China Sea reveal the transfer of near-inertial energy between the background currents associated with mesoscale eddies and near-inertial currents (NICs). A series of numerical experiments are co...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2025-06-01
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| Series: | Ocean Science |
| Online Access: | https://os.copernicus.org/articles/21/1047/2025/os-21-1047-2025.pdf |
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| author | Y. Zhang J. Gu S. Chen J. Hu J. Sheng J. Xing |
| author_facet | Y. Zhang J. Gu S. Chen J. Hu J. Sheng J. Xing |
| author_sort | Y. Zhang |
| collection | DOAJ |
| description | <p>Analyses of current observations and numerical simulations at two moorings in the northern South China Sea reveal the transfer of near-inertial energy between the background currents associated with mesoscale eddies and near-inertial currents (NICs). A series of numerical experiments are conducted to determine important parameters affecting the energy transfer between idealized mesoscale eddies and NICs generated by rotating winds. Speeds of NICs transferred by both cyclonic and anticyclonic mesoscale eddies increase linearly with the wind stress and eddy strength. The transferred NICs in anticyclonic eddies have current amplitudes about 6 times larger than in cyclonic eddies. The translation speed of the mesoscale eddy and the wind rotation frequency also affect the conversion of NICs. The energy transfer rate is elevated with the increase in the positive Okubo–Weiss parameter. A simple theoretical analysis is conducted to verify our findings based on numerical results. Analytical solutions confirm the evident asymmetry of the energy transfer between anticyclonic and cyclonic eddies and quantitatively demonstrate the relationship between the wind stress and the near-inertial energy transferred by mesoscale eddies.</p> |
| format | Article |
| id | doaj-art-542a3f8bddaf4e36a149aabd9b1a08b4 |
| institution | OA Journals |
| issn | 1812-0784 1812-0792 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Ocean Science |
| spelling | doaj-art-542a3f8bddaf4e36a149aabd9b1a08b42025-08-20T02:36:02ZengCopernicus PublicationsOcean Science1812-07841812-07922025-06-01211047106310.5194/os-21-1047-2025Sensitivity study of energy transfer between mesoscale eddies and wind-induced near-inertial oscillationsY. Zhang0J. Gu1S. Chen2J. Hu3J. Sheng4J. Xing5Institute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, ChinaInstitute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, ChinaInstitute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, ChinaState Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen, 361102, ChinaDepartment of Oceanography, Dalhousie University, Halifax, NS B3H 4R2, CanadaInstitute for Ocean Engineering, Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518055, China<p>Analyses of current observations and numerical simulations at two moorings in the northern South China Sea reveal the transfer of near-inertial energy between the background currents associated with mesoscale eddies and near-inertial currents (NICs). A series of numerical experiments are conducted to determine important parameters affecting the energy transfer between idealized mesoscale eddies and NICs generated by rotating winds. Speeds of NICs transferred by both cyclonic and anticyclonic mesoscale eddies increase linearly with the wind stress and eddy strength. The transferred NICs in anticyclonic eddies have current amplitudes about 6 times larger than in cyclonic eddies. The translation speed of the mesoscale eddy and the wind rotation frequency also affect the conversion of NICs. The energy transfer rate is elevated with the increase in the positive Okubo–Weiss parameter. A simple theoretical analysis is conducted to verify our findings based on numerical results. Analytical solutions confirm the evident asymmetry of the energy transfer between anticyclonic and cyclonic eddies and quantitatively demonstrate the relationship between the wind stress and the near-inertial energy transferred by mesoscale eddies.</p>https://os.copernicus.org/articles/21/1047/2025/os-21-1047-2025.pdf |
| spellingShingle | Y. Zhang J. Gu S. Chen J. Hu J. Sheng J. Xing Sensitivity study of energy transfer between mesoscale eddies and wind-induced near-inertial oscillations Ocean Science |
| title | Sensitivity study of energy transfer between mesoscale eddies and wind-induced near-inertial oscillations |
| title_full | Sensitivity study of energy transfer between mesoscale eddies and wind-induced near-inertial oscillations |
| title_fullStr | Sensitivity study of energy transfer between mesoscale eddies and wind-induced near-inertial oscillations |
| title_full_unstemmed | Sensitivity study of energy transfer between mesoscale eddies and wind-induced near-inertial oscillations |
| title_short | Sensitivity study of energy transfer between mesoscale eddies and wind-induced near-inertial oscillations |
| title_sort | sensitivity study of energy transfer between mesoscale eddies and wind induced near inertial oscillations |
| url | https://os.copernicus.org/articles/21/1047/2025/os-21-1047-2025.pdf |
| work_keys_str_mv | AT yzhang sensitivitystudyofenergytransferbetweenmesoscaleeddiesandwindinducednearinertialoscillations AT jgu sensitivitystudyofenergytransferbetweenmesoscaleeddiesandwindinducednearinertialoscillations AT schen sensitivitystudyofenergytransferbetweenmesoscaleeddiesandwindinducednearinertialoscillations AT jhu sensitivitystudyofenergytransferbetweenmesoscaleeddiesandwindinducednearinertialoscillations AT jsheng sensitivitystudyofenergytransferbetweenmesoscaleeddiesandwindinducednearinertialoscillations AT jxing sensitivitystudyofenergytransferbetweenmesoscaleeddiesandwindinducednearinertialoscillations |