Seasonal Variability and Dynamics of the Pacific North Equatorial Subsurface Current

doi:10.1175/JPO-D-19-0261.1

IOCAS-IR > 海洋环流与波动重点实验室

	Seasonal Variability and Dynamics of the Pacific North Equatorial Subsurface Current
	Yang, Ya1,2,3,4,5 ; Li, Xiang 1,2,3,4; Wang, Jing1,2,3,4 ; Yuan, Dongliang1,2,3,4,5
	2020-09-01
发表期刊	JOURNAL OF PHYSICAL OCEANOGRAPHY
ISSN	0022-3670
卷号	50 期号:9 页码:2457-2474
通讯作者	Yuan, Dongliang(dyuan@qdio.ac.cn)
摘要	The North Equatorial Subsurface Current (NESC) is a subthermocline ocean current uncovered recently in the tropical Pacific Ocean, flowing westward below the North Equatorial Countercurrent. In this study, the dynamics of the seasonal cycle of this current are studied using historical shipboard acoustic Doppler current profiler measurements and Argo absolute geostrophic currents. Both data show a westward current at the depths of 200-1000m between 4 degrees and 6 degrees N, with a typical core speed of about 5 and 2 cm s(-1), respectively. The subsurface current originates in the eastern Pacific, with its core descending to deeper isopycnal surfaces and moving to the equator as it flows westward. The zonal velocity of the NESC shows pronounced seasonal variability, with the annual-cycle harmonics of vertical isothermal displacement and zonal velocity presenting characters of vertically propagating baroclinic Rossby waves. A simple analytical Rossby wave model is employed to simulate the propagation of the seasonal variations of the westward zonal currents successfully, which is the basis for exploring the wind forcing dynamics. The results suggest that the wind curl forcing in the central-eastern basin between 170 degrees and 140 degrees W associated with the meridional movement of the intertropical convergence zone dominates the NESC seasonal variability in the western Pacific, with the winds west of 170 degrees W and east of 140 degrees W playing a minor role in the forcing.
DOI	10.1175/JPO-D-19-0261.1
收录类别	SCI
语种	英语
资助项目	NSFC[41776011] ; NSFC[41421005] ; NSFC[41720104008] ; NSFC[91858204] ; Strategic Priority Research Program of CAS[XDB42000000] ; National Key R&D Program of China[2019YFA0606702] ; National Key R&D Program of Shandong Provincial[U1606402]
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:000589825700003
出版者	AMER METEOROLOGICAL SOC
引用统计	被引频次：12[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/337002/169232
专题	海洋环流与波动重点实验室
通讯作者	Yuan, Dongliang
作者单位	1.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Beijing, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol Qingdao, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Peoples R China 5.Univ Chinese Acad Sci, Beijing, Peoples R China
第一作者单位	海洋环流与波动重点实验室; 中国科学院海洋研究所; 中国科学院海洋大科学研究中心
通讯作者单位	海洋环流与波动重点实验室; 中国科学院海洋研究所; 中国科学院海洋大科学研究中心
推荐引用方式 GB/T 7714	Yang, Ya,Li, Xiang,Wang, Jing,et al. Seasonal Variability and Dynamics of the Pacific North Equatorial Subsurface Current[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2020,50(9):2457-2474.
APA	Yang, Ya,Li, Xiang,Wang, Jing,&Yuan, Dongliang.(2020).Seasonal Variability and Dynamics of the Pacific North Equatorial Subsurface Current.JOURNAL OF PHYSICAL OCEANOGRAPHY,50(9),2457-2474.
MLA	Yang, Ya,et al."Seasonal Variability and Dynamics of the Pacific North Equatorial Subsurface Current".JOURNAL OF PHYSICAL OCEANOGRAPHY 50.9(2020):2457-2474.

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文件名称/大小	文献类型	版本类型	开放类型	使用许可
Current.pdf（4779KB）	期刊论文	出版稿	限制开放	CC BY-NC-SA	浏览