Interannual variations of the North Equatorial Current/Undercurrent from mooring array observations

doi:10.3389/fmars.2022.979442

IOCAS-IR > 海洋环流与波动重点实验室

	Interannual variations of the North Equatorial Current/Undercurrent from mooring array observations
	Huang, Ying 1,2,3; Zhang, Linlin 1,2,3,4; Wang, Fujun 1,2,3,4; Wang, Fan1,2,3,4 ; Hu, Dunxin 1,2,3,4
	2022-09-02
发表期刊	FRONTIERS IN MARINE SCIENCE
卷号	9 页码:16
通讯作者	Zhang, Linlin(zhanglinlin@qdio.ac.cn)
摘要	Interannual variability of the North Equatorial Current (NEC)/Undercurrent (NEUC) in the northwestern Pacific was investigated with the mooring array measurements at 130 degrees E during 2014-2021, in combination with the satellite altimetry. Mooring observations indicate that the velocity of the NEC/NEUC in the upper 900 m exhibits significant variations on the interannual time scale. The westward-flowing NEC strengthens when the underlying eastward-flowing NEUC weakens, and the NEUC branch at 8.5 degrees N is intensified during the mature phase of El Nino and reaches the maximum velocity during the decay phase of El Nino. The phase of the interannual variation of the currents delays with the increasing latitude, with the signal at 15 degrees N lagging that at 8.5 degrees N by about one year. Based on a 1.5 layer reduced gravity model, the interannual variation is suggested to be controlled mainly by the westward propagating baroclinic Rossby wave induced by the wind stress curl forcing in the central Pacific. Different propagating speed of the baroclinic Rossby wave at different latitudes explains the meridional phase lag of the interannual signal. Empirical Orthogonal Function and vertical mode decomposition analysis suggest that the interannual variation of the NEC/NEUC velocity in the northern part is dominated by surface-intensified signals with a vertical structure of the first baroclinic mode, while that in the southern part is dominated by subsurface-intensified signals which is associated with the combination of the first two baroclinic modes. The low-order mode baroclinic response of the ocean to the wind forcing accounts for the interannual fluctuation of the NEC/NEUC velocity observed by the mooring array.
关键词	North Equatorial Current North Equatorial Undercurrent interannual variability Rossby wave vertical mode
DOI	10.3389/fmars.2022.979442
收录类别	SCI
语种	英语
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42010105] ; National Key Research and Development Program of China[2017YFA0603202] ; National Key Research and Development Program of China[2020YFA0608801] ; National Natural Science Foundation of China[42122041] ; Youth Innovation Promotion Association (CAS) ; TS Scholar Program ; NSFC Shiptime Sharing Projects[41849909] ; NSFC Shiptime Sharing Projects[42049909] ; QNLM shipboard observation cruise[2022QNLM010103]
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
WOS类目	Environmental Sciences ; Marine & Freshwater Biology
WOS记录号	WOS:000855640800001
出版者	FRONTIERS MEDIA SA
引用统计	被引频次：4[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/337002/180811
专题	海洋环流与波动重点实验室
通讯作者	Zhang, Linlin
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.Pilot Natl Lab Marine Sci & Technol, Qingdao, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China
第一作者单位	海洋环流与波动重点实验室
通讯作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Huang, Ying,Zhang, Linlin,Wang, Fujun,et al. Interannual variations of the North Equatorial Current/Undercurrent from mooring array observations[J]. FRONTIERS IN MARINE SCIENCE,2022,9:16.
APA	Huang, Ying,Zhang, Linlin,Wang, Fujun,Wang, Fan,&Hu, Dunxin.(2022).Interannual variations of the North Equatorial Current/Undercurrent from mooring array observations.FRONTIERS IN MARINE SCIENCE,9,16.
MLA	Huang, Ying,et al."Interannual variations of the North Equatorial Current/Undercurrent from mooring array observations".FRONTIERS IN MARINE SCIENCE 9(2022):16.