Eddy generation and evolution in the North Pacific Subtropical Countercurrent(NPSC) zone

IOCAS-IR

	Eddy generation and evolution in the North Pacific Subtropical Countercurrent(NPSC) zone
	Kang L(康霖); Wang F(王凡); Chen YL(陈永利)
发表期刊	Chinese Journal of Oceanology and Limnology
ISSN	0254-4059
	2010-09-15
出版年	2010
卷号	v.28 期号:05 页码:16-21
文献类型	CNKI期刊论文
摘要	The seasonal generation and evolution of eddies in the region of the North Pacific Subtropical Countercurrent remain poorly understood due to the scarcity of available data.We used TOPEX/POSEIDON altimetry data from 1992 to 2007 to study the eddy field in this zone.We found that velocity shear between this region and the neighboring North Equatorial Current contributes greatly to the eddy generation.Furthermore,the eddy kinetic energy level(EKE) shows an annual cycle,maximum in April/May and minimum in December/January.Analyses of the temporal and spatial distributions of the eddy field revealed clearly that the velocity shear closely related to baroclinic instability processes.The eddy field seems to be more zonal than meridional,and the energy containing length scale shows a surprising lag of 2-3 months in comparison with the 1-D and 2-D EKE level.A similar phenomenon is observed in individual eddies in this zone.The results show that in this eddy field band,the velocity shear may drive the EKE level change so that the eddy field takes another 2-3 months to grow and interact to reach a relatively stable state.This explains the seasonal evolution of identifiable eddies.
关键词	TOPEX/POSEIDON altimetry eddy field EKE velocity shear North Pacific Subtropical Countercurrent
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A010
CNKI专题名称	海洋学;
分类号	P731.2
收录类别	中科院核心
语种	英文;
资助项目(基金）	Supported by the Key Program of the Knowledge Innovation Program of the Chinese Academy of Sciences (No.KZCX1-YW-12-04) ; the National Basic Research Program (973 Program) (No.2006CB403601)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/191955
专题	中国科学院海洋研究所
作者单位	1.InstituteofOceanology,ChineseAcademyofSciences 2.KeyLaboratoryofCirculationandWaves,ChineseAcademyofSciences 3.GraduateUniversityofChineseAcademyofSciences
推荐引用方式 GB/T 7714	Kang L,Wang F,Chen YL. Eddy generation and evolution in the North Pacific Subtropical Countercurrent(NPSC) zone. 2010.