Seasonal variability of the North Equatorial Current transport in the western Pacific Ocean

IOCAS-IR

	Seasonal variability of the North Equatorial Current transport in the western Pacific Ocean
	Yan QX(闫庆勋); Hu DX(胡敦欣); Zhai FG(翟方国)
发表期刊	Chinese Journal of Oceanology and Limnology
ISSN	0254-4059
	2014-01-15
出版年	2014
卷号	v.32 期号:01 页码:225-239
文献类型	CNKI期刊论文
摘要	Seasonal variability of the North Equatorial Current(NEC) transport in the western Pacifi c Ocean is investigated with ECMWF Ocean Analysis/Reanalysis System 3(ORA-S3). The result shows that NEC transport(NT) across different longitudes in the research area shows a similar double-peak structure, with two maxima(in summer and winter), and two minima(in spring and autumn). This kind of structure can also be found in NEC geostrophic transport(NGT), but in a different magnitude and phase. These differences are attributable to Ekman transport induced by the local meridional wind and transport caused by nonzero velocity at the reference level, which is assumed to be zero in the NGT calculation. In the present work, a linear vorticity equation governing a 1.5-layer reduced gravity model is adopted to examine the dynamics of the seasonal variability of NGT. It is found that the annual cycle of NGT is mainly controlled by Ekman pumping induced by local wind, and westward-propagating Rossby waves induced by remote wind. Further research demonstrates that the maximum in winter and minimum in spring are mostly attributed to wind east of the dateline, whilst the maximum in summer and minimum in autumn are largely attributed to that west of the dateline.
关键词	North Equatorial Current(NEC) transport seasonal variability linear vorticity equation
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 ; 中科院扩展
语种	英文;
资助项目(基金）	Supported by the National Basic Research Program of China(973 Program)(Nos.2012CB417401,2013CB956202) ; the Major Project of National Natural Science Foundation of China(No.40890151)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/190592
专题	中国科学院海洋研究所
作者单位	1.KeyLaboratoryofOceanCirculationandWaves,ChineseAcademyofSciences 2.InstituteofOceanology,ChineseAcademyofSciences 3.UniversityofChineseAcademyofSciences 4.ThirdInstituteofOceanography,StateOceanicAdministration
推荐引用方式 GB/T 7714	Yan QX,Hu DX,Zhai FG. Seasonal variability of the North Equatorial Current transport in the western Pacific Ocean. 2014.