Institutional Repository of Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
| Optimal Precursor Triggering Kuroshio Large Meander Decay Obtained in a Regional Ocean Model | |
Liu, Xia1; Wang, Qiang2,3; Zhang, Hui4,5
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| 2022-06-01 | |
| Source Publication | JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
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| ISSN | 2169-9275 |
| Volume | 127Issue:6Pages:18 |
| Corresponding Author | Wang, Qiang(wangq@hhu.edu.cn) |
| Abstract | This study investigates the optimal precursor (OPR) triggering Kuroshio large meander (LM) decay using a conditional nonlinear optimal perturbation (CNOP) approach and a regional ocean modeling system (ROMS). The results show that the large amplitudes of the OPR are mainly concentrated at 1,000-2,500 m in the LM upstream region (west of 137 degrees E), and their propagation downstream along the Kuroshio axis contributes to triggering the transition from the LM path to the nonlarge meander (NLM) path. Using the growth of the OPR, it is found that baroclinic instability contributes to the fast vertical development of the perturbations in the early stage of the LM decay, while barotropic processes play a leading role during the cyclonic ring shedding of the LM decay. In particular, the LM decay process is evaluated by the depth-integrated vorticity equation, implying that the advection term dominates over the beta effect in the LM decay. Furthermore, the vorticity balance associated with the cyclonic eddy indicates that the advection and divergence terms represent a main balance in the spin-down process of the cyclonic eddy. Under the effects of both, high potential vorticity water flows out from the LM meander tip and then the amplitude of the LM experiences a remarkable decrease. With the detachment of a cyclonic ring, a transition from the LM path to the NLM path occurs. This study further deepens our understanding of the LM decay and provides us some useful hints about designing the observation system of the LM. |
| Keyword | predictability large meander decay optimal precursor conditional nonlinear optimal perturbation |
| DOI | 10.1029/2021JC018397 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Scientific Foundation of China[41906003] ; National Natural Scientific Foundation of China[42076017] ; National Natural Scientific Foundation of China[41906022] ; Fundamental Research Funds for the Central Universities[B200201011] ; Basic Research Projects of Key Scientific Research Projects Plan in Henan Higher Education Institutions[20zx003] ; Henan Natural Science Foundation[222300420579] ; Henan Province Key R&D and Promotion Project[222102210228] |
| WOS Research Area | Oceanography |
| WOS Subject | Oceanography |
| WOS ID | WOS:000806638300001 |
| Publisher | AMER GEOPHYSICAL UNION |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/179531 |
| Collection | 海洋环流与波动重点实验室 |
| Corresponding Author | Wang, Qiang |
| Affiliation | 1.Zhengzhou Univ Aeronaut, Sch Math, Zhengzhou, Peoples R China 2.Hohai Univ, Minist Nat Resources, Key Lab Marine Hazards Forecasting, Nanjing, Peoples R China 3.Hohai Univ, Coll Oceanog, Nanjing, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 5.Univ Chinese Acad Sci, Beijing, Peoples R China |
| Recommended Citation GB/T 7714 | Liu, Xia,Wang, Qiang,Zhang, Hui. Optimal Precursor Triggering Kuroshio Large Meander Decay Obtained in a Regional Ocean Model[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2022,127(6):18. |
| APA | Liu, Xia,Wang, Qiang,&Zhang, Hui.(2022).Optimal Precursor Triggering Kuroshio Large Meander Decay Obtained in a Regional Ocean Model.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,127(6),18. |
| MLA | Liu, Xia,et al."Optimal Precursor Triggering Kuroshio Large Meander Decay Obtained in a Regional Ocean Model".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 127.6(2022):18. |
| Files in This Item: | ||||||
| File Name/Size | DocType | Version | Access | License | ||
| JGR Oceans - 2022 - （5258KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | View | |
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