Variability of sea surface height in the South China Sea and its relationship to Pacific oscillations

IOCAS-IR

	Variability of sea surface height in the South China Sea and its relationship to Pacific oscillations
	PEI Yuhua ; ZHANG Rong-Hua; ZHANG Xiangming ; JIANG Lianghong ; WEI Yanzhou
发表期刊	Acta Oceanologica Sinica
ISSN	0253-505X
	2015-12-15
出版年	2015
卷号	v.34 期号:12 页码:84-96
文献类型	CNKI期刊论文
摘要	The spatio-temporal variability modes of the sea surface height in the South China Sea(SCS-SSH) are obtained using the Cyclostationary Empirical Orthogonal Function(CSEOF) method, and their relationships to the Pacific basin scale oscillations are examined. The first CSEOF mode of the SCS-SSH is a strongly phase-locked annual cycle that is modulated by a slowly varying principal component(PC); the strength of this annual cycle becomes reduced during El Ni?o events(at largest by 30% off in 1997/98) and enhanced during La Ni?a events. The second mode is a low frequency oscillation nearly on decadal time scale, with its spatial structure exhibiting an obscure month-dependence; the corresponding PC is highly correlated with the Pacific Decadal Oscillation(PDO) index.Five independent oscillations in the Pacific are isolated by using the independent component(IC) analysis(ICA)method, and their effects on the SCS-SSH are examined. It is revealed that the pure ENSO mode(which resembles the east Pacific ENSO) has little effect on the low frequency variability of the SCS-SSH while the ENSO reddening mode(which resembles the central Pacific ENSO) has clear effect. As the ENSO reddening mode is an important constituent of the PDO, this explains why the PDO is more important than ENSO in modulating the low frequency variability of SCS-SSH. Meridional saddle like oscillation mode, the Kuroshio extension warming mode, and the equatorial cooling mode are also successfully detected by the ICA, but they have little effect on the low frequency variability of the SCS-SSH. Further analyses suggest the Pacific oscillations are probably influencing the variability of the SCS-SSH in ways that are different from that of the sea surface temperature(SST) in the SCS.
关键词	South China Sea sea surface height ENSO PDO
CNKI专辑号	A;
CNKI专辑名称	基础科学;
CNKI专题号	A009;A010;
CNKI专题名称	气象学;海洋学;
分类号	P731.2;P732.6
收录类别	中科院核心 ; 中科院扩展
语种	英文;
资助项目(基金）	The National Natural Science Foundation of China under contract Nos 91128204,41321004,41475101 and 41421005 ; the National Basic Research Program(973 Program)of China under contract No.2013CB430302 ; the Natural Science Foundation of China-Shandong Joint Fund for Marine Science Research Centers under contract No.U1406401 ; the Strategic Priority Project of Chinese Academy of Sciences under contract Nos XDA11010301 and XDA11010104
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/189839
专题	中国科学院海洋研究所
作者单位	1.CollegeofOceanicandAtmosphericSciences,OceanUniversityofChina 2.StateKeyLaboratoryofSatelliteOceanEnvironmentDynamics,SecondInstituteofOceanography,StateOceanicAdministration 3.KeyLaboratoryofOceanCirculationandWaves,InstituteofOceanology,ChineseAcademyofSciences
推荐引用方式 GB/T 7714	PEI Yuhua,ZHANG Rong-Hua,ZHANG Xiangming,et al. Variability of sea surface height in the South China Sea and its relationship to Pacific oscillations. 2015.