Optimal Precursor Triggering Kuroshio Large Meander Decay Obtained in a Regional Ocean Model

doi:10.1029/2021JC018397

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	Optimal Precursor Triggering Kuroshio Large Meander Decay Obtained in a Regional Ocean Model
	Liu, Xia 4; Wang, Qiang 1,5; Zhang, Hui 2,3
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2022-06-01
卷号	127 期号:6 页码:18
关键词	predictability large meander decay optimal precursor conditional nonlinear optimal perturbation
ISSN号	2169-9275
DOI	10.1029/2021JC018397
通讯作者	Wang, Qiang(wangq@hhu.edu.cn)
英文摘要	This study investigates the optimal precursor (OPR) triggering Kuroshio large meander (LM) decay using a conditional nonlinear optimal perturbation (CNOP) approach and a regional ocean modeling system (ROMS). The results show that the large amplitudes of the OPR are mainly concentrated at 1,000-2,500 m in the LM upstream region (west of 137 degrees E), and their propagation downstream along the Kuroshio axis contributes to triggering the transition from the LM path to the nonlarge meander (NLM) path. Using the growth of the OPR, it is found that baroclinic instability contributes to the fast vertical development of the perturbations in the early stage of the LM decay, while barotropic processes play a leading role during the cyclonic ring shedding of the LM decay. In particular, the LM decay process is evaluated by the depth-integrated vorticity equation, implying that the advection term dominates over the beta effect in the LM decay. Furthermore, the vorticity balance associated with the cyclonic eddy indicates that the advection and divergence terms represent a main balance in the spin-down process of the cyclonic eddy. Under the effects of both, high potential vorticity water flows out from the LM meander tip and then the amplitude of the LM experiences a remarkable decrease. With the detachment of a cyclonic ring, a transition from the LM path to the NLM path occurs. This study further deepens our understanding of the LM decay and provides us some useful hints about designing the observation system of the LM.
资助项目	National Natural Scientific Foundation of China[41906003] ; National Natural Scientific Foundation of China[42076017] ; National Natural Scientific Foundation of China[41906022] ; Fundamental Research Funds for the Central Universities[B200201011] ; Basic Research Projects of Key Scientific Research Projects Plan in Henan Higher Education Institutions[20zx003] ; Henan Natural Science Foundation[222300420579] ; Henan Province Key R&D and Promotion Project[222102210228]
WOS研究方向	Oceanography
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000806638300001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/179530]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Wang, Qiang
作者单位	1.Hohai Univ, Minist Nat Resources, Key Lab Marine Hazards Forecasting, Nanjing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 4.Zhengzhou Univ Aeronaut, Sch Math, Zhengzhou, Peoples R China 5.Hohai Univ, Coll Oceanog, Nanjing, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xia,Wang, Qiang,Zhang, Hui. Optimal Precursor Triggering Kuroshio Large Meander Decay Obtained in a Regional Ocean Model[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2022,127(6):18.
APA	Liu, Xia,Wang, Qiang,&Zhang, Hui.(2022).Optimal Precursor Triggering Kuroshio Large Meander Decay Obtained in a Regional Ocean Model.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,127(6),18.
MLA	Liu, Xia,et al."Optimal Precursor Triggering Kuroshio Large Meander Decay Obtained in a Regional Ocean Model".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 127.6(2022):18.