| 摘要 | 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 Reincrease 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. |
| 作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Shandong, Peoples R China
2.Natl Univ Def Technol, Coll Meteorol & Oceanog, Nanjing 211101, Jiangsu, Peoples R China
3.Pilot Natl Lab Marine Sci & Technol Qingdao, Funct Lab Ocean Dynam & Climate, Qingdao 266237, Shandong, Peoples R China
4.Minist Nat Resources, Inst Oceanog 1, Key Lab Marine Sci & Numer Modeling, Qingdao 266061, Shandong, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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推荐引用方式
GB/T 7714 |
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.
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| APA |
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.
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