Optimal precursor of the transition from Kuroshio large meander to straight path

doi:10.1007/s00343-013-2301-1

IOCAS-IR > 海洋环流与波动重点实验室

	Optimal precursor of the transition from Kuroshio large meander to straight path
	Wang Qiang 1,2; Ma Libin 1,3; Xu Qiangqiang 4; Ma, LB
	2013-09-01
发表期刊	CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	0254-4059
卷号	31 期号:5 页码:1153-1161
文章类型	Article
摘要	We used the conditional nonlinear optimal perturbation (CNOP) method to explore the optimal precursor of the transition from Kuroshio large meander (LM) to straight path within a barotropic inflowout-flow model, and found that large amplitudes of the optimal precursor are mainly located in the east of Kyushu, which implies that perturbations in the region are important for the transition from LM to straight path. Furthermore, we investigated the transition processes caused by the optimal precursor, and found that these processes could be divided into three stages. In the first stage, a cyclonic eddy is advected to the formation region of the Kuroshio large meander, which enhances the LM path and causes a cyclonic eddy to shed from the Kuroshio mainstream. This process causes the LM path to change into a small meander path. Subsequently, the small meander is maintained for a period because the vorticity advection is balanced by the beta effect in the second stage. In the third stage, the small meander weakens and the straight path ultimately forms. The positive vorticity advecting downstream is responsible for this process. The exploration of the optimal precursor will conduce to improve the prediction of the transition processes from LM path to straight path, and its spatial structure can be used to guide Kuroshio targeted observation studies.; We used the conditional nonlinear optimal perturbation (CNOP) method to explore the optimal precursor of the transition from Kuroshio large meander (LM) to straight path within a barotropic inflowout-flow model, and found that large amplitudes of the optimal precursor are mainly located in the east of Kyushu, which implies that perturbations in the region are important for the transition from LM to straight path. Furthermore, we investigated the transition processes caused by the optimal precursor, and found that these processes could be divided into three stages. In the first stage, a cyclonic eddy is advected to the formation region of the Kuroshio large meander, which enhances the LM path and causes a cyclonic eddy to shed from the Kuroshio mainstream. This process causes the LM path to change into a small meander path. Subsequently, the small meander is maintained for a period because the vorticity advection is balanced by the beta effect in the second stage. In the third stage, the small meander weakens and the straight path ultimately forms. The positive vorticity advecting downstream is responsible for this process. The exploration of the optimal precursor will conduce to improve the prediction of the transition processes from LM path to straight path, and its spatial structure can be used to guide Kuroshio targeted observation studies.
关键词	Kuroshio Large Meander (Lm) Precursor Conditional Nonlinear Optimal Perturbation (Cnop)
学科领域	Marine & Freshwater Biology ; Oceanography
DOI	10.1007/s00343-013-2301-1
URL	查看原文
收录类别	SCI
语种	英语
WOS研究方向	Marine & Freshwater Biology ; Oceanography
WOS类目	Limnology ; Oceanography
WOS记录号	WOS:000324111300023
WOS关键词	NONLINEAR OPTIMAL PERTURBATION ; RANGE PREDICTION EXPERIMENTS ; VARIABILITIES SOUTH ; JAPAN ; MODEL ; PREDICTABILITY ; CIRCULATION ; SENSITIVITY ; FORECAST ; SYSTEM
WOS标题词	Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
引用统计	被引频次：7[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/16425
专题	海洋环流与波动重点实验室
通讯作者	Ma, LB
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Inst Atmospher Phys, LASG, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Fishery Sci, East China Sea Fisheries Res Inst, Shanghai 200090, Peoples R China
第一作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Wang Qiang,Ma Libin,Xu Qiangqiang,et al. Optimal precursor of the transition from Kuroshio large meander to straight path[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2013,31(5):1153-1161.
APA	Wang Qiang,Ma Libin,Xu Qiangqiang,&Ma, LB.(2013).Optimal precursor of the transition from Kuroshio large meander to straight path.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,31(5),1153-1161.
MLA	Wang Qiang,et al."Optimal precursor of the transition from Kuroshio large meander to straight path".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 31.5(2013):1153-1161.

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