Optimal precursors of double-gyre regime transitions with an adjoint-free method
文献类型：CNKI期刊论文
| 作者 | YUAN Shijin; LI Mi; WANG Qiang; ZHANG Kun ; ZHANG Huazhen; MU Bin
|
| 发表日期 | 2019-07-15 |
| 出处 | Journal of Oceanology and Limnology
 |
| 关键词 | optimal precursors double-gyre regime transitions conditional nonlinear optimal perturbation(CNOP) Principal Component Analysis-based Simulated Annealing(PCASA) multiple-equilibria regimes |
| 英文摘要 | In this paper,we find the optimal precursors which can cause double-gyre regime transitions based on conditional nonlinear optimal perturbation(CNOP)method with Regional Ocean Modeling System(ROMS).Firstly,we simulate the multiple-equilibria regimes of double-gyre circulation under different viscosity coefficient and obtain the bifurcation diagram,then choose two equilibrium states(called jet-up state and jet-down state)as reference states respectively,propose Principal Component Analysisbased Simulated Annealing(PCASA)algorithm to solve CNOP-type initial perturbations which can induce double-gyre regime transitions between jet-up state and j et-down state.PCASA algorithm is an adj oint-free method which searches optimal solution randomly in the whole solution space.In addition,we investigate CNOP-type initial perturbations how to evolve with time.The results show:(1)the CNOP-type perturbations present a two-cell structure,and gradually evolves into a three-cell structure at predictive time;(2)by superimpo sing CNOP-type perturbations on the j et-up state and integrating ROMS,double-gyre circulation transfers from jet-up state to jet-down state,and vice versa,and random initial perturbations don't cause the transitions,which means CNOP-type perturbations are the optimal precursors of double-gyre regime transitions;(3)by analyzing the transition process of double-gyre regime transitions,we find that CNOPtype initial perturbations obtain energy from the background state through both barotropic and baroclinic instabilities,and barotropic instability contributes more significantly to the fast-growth of the perturbations.The optimal precursors and the dynamic mechanism of double-gyre regime transitions revealed in this paper have an important significance to enhance the predictability of double-gyre circulation. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the National Natural Science Foundation of China(No.41405097) ; the Fundamental Research Funds for the Central Universities of China in 2017 |
| 卷 | v.37期:04页:3-19 |
| 语种 | 英文; |
| 分类号 | P731.27 |
| ISSN号 | 2096-5508 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/188499]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.KeyLaboratoryofOceanCirculationandWaves,InstituteofOceanology,ChineseAcademyofSciences 2.SchoolofSoftwareEngineering,TongjiUniversity |
| 推荐引用方式 GB/T 7714 | YUAN Shijin,LI Mi,WANG Qiang,et al. Optimal precursors of double-gyre regime transitions with an adjoint-free method. 2019. |
入库方式： OAI收割
来源：海洋研究所
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