Intraseasonal Variability of the North Equatorial Current Bifurcation Off the Philippines

doi:10.1029/2021JC017646

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	Intraseasonal Variability of the North Equatorial Current Bifurcation Off the Philippines
	Zhou, Hui 1,2,7; Liu, Xueqi 1,2,7; Li, Ruixiang 3; Wang, Yonggang 4,5,6,8; Yang, Guang 4,5,6,8
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2021-11-01
卷号	126 期号:11 页码:16
关键词	western tropical Pacific Ocean NEC bifurcation intraseasonal variability mesoscale eddy MJO cyclonic eddy
ISSN号	2169-9275
DOI	10.1029/2021JC017646
通讯作者	Zhou, Hui(zhouhui@qdio.ac.cn)
英文摘要	Characteristics of the intraseasonal variability (ISV) of the North Equatorial Current bifurcation latitude (NBL) are analyzed by using both observations and reanalysis data. The maximum amplitude of the ISV of the NBL can reach about 6 degrees of latitude, which almost triples its annual excursion. The NBL shows a broad spectral peak around 50-140 days with the highest peak occurring around 73 days. Both the Madden-Julian oscillation and mesoscale eddies have a significant impact on its ISV. A case study for a cyclonic eddy indicates that it can transport about 1.5 Sv (1 Sv-10(6) m(3) s(-1)) waters to the NBL, and the bifurcation shifts northward with an amplitude of about 8 degrees of latitude in 1 month. Meanwhile, the influence of mesoscale eddies on the ISV of the NBL is highly modulated by the interannual variations of the eddy field. Active eddy activities associated with enhanced barotropic and baroclinic instabilities show a large influence on the NBL. The eddy kinetic energy level around the NBL showed a quite diverse character for the 1997-1998 and the 2015-2016 extreme El Ninos, with the latter being double or triple that of the former due to the much stronger vertical and horizontal shears. Given the significant impact on the NBL by the individual eddies and the unevenly distributed cyclonic and anticyclonic eddies around the NBL, the effect of mesoscale eddies on the bifurcation latitude may not cancel each other on seasonal or interannual time scales.
资助项目	NSFC[41776042] ; NSFC[41876009] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42000000]
WOS研究方向	Oceanography
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000723095600031
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/177521]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Zhou, Hui
作者单位	1.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean Dynam & Climate, Qingdao, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.State Ocean Adm, South China Sea Marine Survey & Technol Ctr, Guangzhou, Peoples R China 4.Minist Nat Resources, Inst Oceanog 1, Qingdao, Peoples R China 5.Minist Nat Resources, Key Lab Marine Sci & Numer Modeling, Qingdao, Peoples R China 6.Pilot Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao, Peoples R China 7.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao, Peoples R China 8.Shandong Key Lab Marine Sci & Numer Modeling, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Hui,Liu, Xueqi,Li, Ruixiang,et al. Intraseasonal Variability of the North Equatorial Current Bifurcation Off the Philippines[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2021,126(11):16.
APA	Zhou, Hui,Liu, Xueqi,Li, Ruixiang,Wang, Yonggang,&Yang, Guang.(2021).Intraseasonal Variability of the North Equatorial Current Bifurcation Off the Philippines.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,126(11),16.
MLA	Zhou, Hui,et al."Intraseasonal Variability of the North Equatorial Current Bifurcation Off the Philippines".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 126.11(2021):16.