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Bo ZHAO, Zhenhua XU, Qun LI, Wenjia MIN, Yang WANG, Baoshu YIN. The characteristics of spontaneous near-inertial wave generation from an anticyclonic mesoscale eddy[J]. Journal of Oceanology and Limnology, 2022, 40(2): 413-427 |
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The characteristics of spontaneous near-inertial wave generation from an anticyclonic mesoscale eddy |
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| Bo ZHAO1,3,4, Zhenhua XU1,2,3,4,5, Qun LI6, Wenjia MIN1,3,4, Yang WANG1,3,4, Baoshu YIN1,2,3,4,5 |
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1 CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology Chinese Academy of Sciences, Qingdao 266071, China;
2 Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China;
3 Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China;
4 College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
5 CAS Engineering Laboratory for Marine Ranching, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
6 Polar Research Institute of China, Shanghai 200136, China |
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| Abstract: |
| The generation and propagation characteristics of near-inertial waves (NIWs) generated spontaneously from a quasi-geostrophic anticyclonic mesoscale eddy in a rotating and stratified fluid were investigated by three-dimensional numerical modeling. NIWs are generated over a long time interval as a forced response to balanced baroclinic mesoscale eddies. For such eddies, NIW generation from balanced flow is an inevitable result as the evolution of eddies. Moreover, the baroclinicity of mesoscale eddies is an essential condition for this NIW generation mechanism. The spontaneously generated NIWs radiate horizontally toward the eddy center and propagate upward in vertical direction. The forcing of the NIWs moves downward along the eddy axis from the location of maximum temperature anomaly of the mesoscale eddy. The moving speed of the forcing is independent on the balanced mesoscale eddies but is determined by the ratio of buoyancy to inertial frequency. When the forcing reaches the bottom of the mesoscale eddy, the spontaneous NIW generation process terminates. NIW intensity in this spontaneous generation process is strengthened with the increase of the Rossby and Froude numbers. Further research to gain a solid understanding of the role of the Rossby and Froude numbers is necessary for the parameterization of spontaneous NIW generation from quasi-geostrophic mesoscale eddies in general circulation model. |
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| Key words:
near-inertial waves (NIWs)|anticyclonic mesoscale eddy|spontaneous generation
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| Received: 2020-10-19 Revised: |
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