| Song Xinxin,Yuan Dongliang,Wang Zheng. 2019. Hysteresis of a periodic or leaking western boundary current flowing by a gap. Acta Oceanologica Sinica, 38(4):90－96 |
| Hysteresis of a periodic or leaking western boundary current flowing by a gap |
| 周期性的或伴有贯穿流的西边界流跨隙流动的迟滞变异过程 |
| Received:May 25, 2018 |
| DOI：10.1007/s13131-018-1251-z |
| Key words:hysteresis periodic western boundary current throughflow |
| 中文关键词: 迟滞过程 周期性的西边界流 贯穿流 |
| 基金项目:The National Program on Global Change and Air-Sea Interaction under contract Nos GASI-03-01-01-05, GASI-IPOVAI-01-02, GASI-IPOVAI-02, GASI-IPOVAI-03, GASI-IPOVAI-01-05 and GASI-03-01-01-02; the National Natural Science Foundation of China (NSFC) under contract Nos 41421005, 41720104008, 41476025, 41376038 and 41876025; the National Natural Science Foundation of China (NSFC)-Shandong Joint Fund for Marine Science Research Centers of China under contract Nos U1606402 and U1606405; the CAS Strategic Priority Project under contract No. XDA11010205; the Scientific and Technological Innovation Project of Qingdao National Laboratory for Marine Science and Technology under contract No. 2016ASKJ04; the National Science and Technology Major Project under contract No. 2016ZX05057015; the Open Fund of Shandong Provincial Key Laboratory of Marine Ecology and Environment & Disaster Prevention and Mitigation under contract No. 201701. |
| Author Name | Affiliation | E-mail | | Song Xinxin | Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China
Key Laboratory of Marine Science and Numerical Modeling, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | Yuan Dongliang | Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Function Laboratory for Ocean Dynamics and Climate, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
University of Chinese Academy of Sciences, Beijing 100049, China | dyuan@qdio.ac.cn | | Wang Zheng | Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
Function Laboratory for Ocean Dynamics and Climate, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China | |
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| Abstract: |
| A 1.5-layer quasi-geostrophic reduced gravity model is used to study the hysteresis of a periodic or leaking western boundary current (WBC) flowing by a gap. When the periods of the WBC variations are much longer than the Rossby adjustment time scales of the circulation in the vicinity of the gap, the Hopf bifurcations during the Re-increase and Re-decrease loops are delayed to produce a new domain of hysteresis of the Reynolds numbers, and the critical Reynolds numbers of the WBC regime transitions change significantly, with the domain of the hysteresis Reynolds number larger for shorter periodic forcing. When the periods of the WBC variations are comparable to those of the Rossby adjustment time scales of the circulation in the vicinity of the gap, the WBC path inside the gap becomes periodic without hysteresis. The intrusion of the WBC into the western basin generally gets smaller as the period decreases. In addition, the partial leakage of the WBC transport through the gap into the western basin is found to have significant impact on the hysteresis loop of the WBC path when the leaked transport is larger than 1/2 of the WBC. Both the intrusion extent and the critical Reynolds numbers of the WBC regime transition are changed, and the larger the throughflow transport, the larger the change. |
| 中文摘要: |
| 使用1.5层准地转约化重力模式研究了周期性的或伴有贯穿流的西边界流跨隙流动的迟滞变异过程。当西边界流变化的周期比罗斯贝波在缺口处调整的时间尺度大得多时，在雷诺数增加和减少过程的霍夫分叉点都发生延迟，从而产生新的雷诺数迟滞区间；并且西边界流流态转变的临界值变化显著；且周期强迫越短，雷诺数迟滞区间越大。当西边界流变化的周期与罗斯贝波在缺口处调整的时间尺度相当时，西边界流在缺口的流态呈无迟滞的周期性变化，且西边界流入侵西海盆的程度随周期减少而变小。此外，当贯穿流的流量大于西边界流的一半时，会显著影响西边界流在缺口处的迟滞变异过程；西边界流向西入侵程度和流态转变发生的临界雷诺值均发生变化，且贯穿流流量越大变化越大。 |
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