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 | |
| 发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
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| ISSN | 2169-9275 |
| 卷号 | 127期号:6页码:18 |
| 通讯作者 | Wang, Qiang(wangq@hhu.edu.cn) |
| 摘要 | 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. |
| 关键词 | predictability large meander decay optimal precursor conditional nonlinear optimal perturbation |
| DOI | 10.1029/2021JC018397 |
| 收录类别 | SCI |
| 语种 | 英语 |
| 资助项目 | 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研究方向 | Oceanography |
| WOS类目 | Oceanography |
| WOS记录号 | WOS:000806638300001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.qdio.ac.cn/handle/337002/179531 |
| 专题 | 海洋环流与波动重点实验室 |
| 通讯作者 | Wang, Qiang |
| 作者单位 | 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 |
| 推荐引用方式 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. |
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| 文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
| JGR Oceans - 2022 - （5258KB） | 期刊论文 | 出版稿 | 限制开放 | CC BY-NC-SA | 浏览 | |
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