Hysteresis of a periodic or leaking western boundary current flowing by a gap

Song Xinxin; Yuan Dongliang; Wang Zheng

doi:10.1007/s13131-018-1251-z

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Article Navigation > Acta Oceanologica Sinica > 2019 > 38(4): 90-96

Song Xinxin, Yuan Dongliang, Wang Zheng. Hysteresis of a periodic or leaking western boundary current flowing by a gap[J]. Acta Oceanologica Sinica, 2019, 38(4): 90-96. doi: 10.1007/s13131-018-1251-z

Citation:

Song Xinxin, Yuan Dongliang, Wang Zheng. Hysteresis of a periodic or leaking western boundary current flowing by a gap[J]. Acta Oceanologica Sinica, 2019, 38(4): 90-96. doi: 10.1007/s13131-018-1251-z

Song Xinxin, Yuan Dongliang, Wang Zheng. Hysteresis of a periodic or leaking western boundary current flowing by a gap[J]. Acta Oceanologica Sinica, 2019, 38(4): 90-96. doi: 10.1007/s13131-018-1251-z

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Hysteresis of a periodic or leaking western boundary current flowing by a gap

doi: 10.1007/s13131-018-1251-z

1.
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
2.
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
3.
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

Received Date: 2018-05-25

Abstract

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.
- hysteresis,
- periodic western boundary current,
- throughflow

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References(33)

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