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

doi:10.1007/s00343-010-9010-9

IOCAS-IR > 海洋环流与波动重点实验室

	Eddy generation and evolution in the North Pacific Subtropical Countercurrent (NPSC) zone
	Kang Lin 1,2,3; Wang Fan1,2 ; Chen Yongli 1,2
	2010-09-01
发表期刊	CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	0254-4059
卷号	28 期号:5 页码:968-973
文章类型	Article
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.; 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
学科领域	Limnology ; Oceanography
DOI	10.1007/s00343-010-9010-9
URL	查看原文
收录类别	SCI
语种	英语
WOS记录号	WOS:000281711600003
引用统计	被引频次：8[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/337002/5274
专题	海洋环流与波动重点实验室
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Key Lab Circulat & Waves, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Kang Lin,Wang Fan,Chen Yongli. Eddy generation and evolution in the North Pacific Subtropical Countercurrent (NPSC) zone[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2010,28(5):968-973.
APA	Kang Lin,Wang Fan,&Chen Yongli.(2010).Eddy generation and evolution in the North Pacific Subtropical Countercurrent (NPSC) zone.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,28(5),968-973.
MLA	Kang Lin,et al."Eddy generation and evolution in the North Pacific Subtropical Countercurrent (NPSC) zone".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 28.5(2010):968-973.

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