| WANG Shihong,LIU Zhiliang,PANG Chongguang,LIU Huiqing. 2016. The decadally modulating eddy field in the upstream Kuroshio Extension and its related mechanisms. Acta Oceanologica Sinica, 35(5):9－17 |
| The decadally modulating eddy field in the upstream Kuroshio Extension and its related mechanisms |
| 黑潮延伸体上游中尺度涡场的年代际振荡及其相关机制 |
| Received:May 12, 2015 Revised:September 06, 2015 |
| DOI：10.1007/s13131-015-0741-5 |
| Key words:Kuroshio Extension mesoscale eddy decadal modulation baroclinic instability barotropic energy conversion rate nonlinear eddy-eddy interaction |
| 中文关键词: 黑潮延伸体 中尺度涡 年代际振荡 斜压不稳定 正压不稳定 非线性涡-涡相互作用 |
| 基金项目:The National Natural Science Foundation of China under contract No. 41276026; the Special Fund for Strategic Pilot Technology Chinese Academy of Sciences under contract No. XDA11020301; the Joint Fund between Natural Science Foundation of China and Shandong Province under contract No. U1406401. |
| Author Name | Affiliation | E-mail | | WANG Shihong | Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China | | | LIU Zhiliang | Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | zhlliu@qdio.ac.cn | | PANG Chongguang | Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China | | | LIU Huiqing | International Hurricane Research Center, Florida International University, Miami, MARC 370, USA | |
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| Abstract: |
| Both the level of the high-frequency eddy kinetic energy (HF-EKE) and the energy-containing scale in the upstream Kuroshio Extension (KE) undergo a well-defined decadal modulation, which correlates well with the decadal KE path variability. The HF-EKE level and the energy-containing scales will increase with unstable KE path and decrease with stable KE path. Also the mesoscale eddies are a little meridionally elongated in the stable state, while they are much zonally elongated in the unstable state. The local baroclinic instability and the barotropic instability associated with the decadal modulation of HF-EKE have been investigated. The results show that the baroclinic instability is stronger in the stable state than that in the unstable state, with a shorter characteristic temporal scale and a larger characteristic spatial scale. Meanwhile, the regional-averaged barotropic conversion rate is larger in the unstable state than that in the stable state. The results also demonstrate that the baroclinic instability is not the dominant mechanism influencing the decadal modulation of the mesoscale eddy field, while the barotropic instability makes a positive contribution to the decadal modulation. |
| 中文摘要: |
| 黑潮延伸体上游区域的中尺度涡场的涡动能和涡特征尺度存在显著地年代际振荡,和黑潮延伸体路径的年代际变化有很好的相关性。当黑潮延伸体路径比较稳定时,其上游区域涡动能比较高,涡特征尺度比较大,反之相反。通过对黑潮延伸体上游区域的中尺度涡场进行集合分析发现:当黑潮延伸体处于稳定状态时,上游涡场几乎是各向均匀地,有轻微的径向伸长;而当黑潮延伸体处于不稳定状态时,上游的中尺度涡场有显著地纬向伸长。对与中尺度涡场的产生相关的线性斜压不稳定和正压不稳定进行了计算分析,结果显示,线性斜压不稳定不是控制中尺度涡场年代际变化的机制,而正压不稳定对中尺度涡场的年代际变化有积极的贡献。不稳定产生的中尺度涡之间存在非线性涡-涡相互作用。 |
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