Effects of Interannual Salinity Variability on the Barrier Layer in the Western-Central Equatorial Pacific:A Diagnostic Analysis from Argo

IOCAS-IR

	Effects of Interannual Salinity Variability on the Barrier Layer in the Western-Central Equatorial Pacific:A Diagnostic Analysis from Argo
	ZHENG Fei ; ZHANG Rong-Hua; ZHU Jiang
发表期刊	Advances in Atmospheric Sciences
ISSN	0256-1530
	2014-05-10
出版年	2014
卷号	v.31 期号:03 页码:30-40
文献类型	CNKI期刊论文
摘要	In this paper, interannual variations in the barrier layer thickness(BLT) are analyzed using Argo three-dimensional temperature and salinity data, with a focus on the effects of interannually varying salinity on the evolution of the El Nino–Southern Oscillation(ENSO). The interannually varying BLT exhibits a zonal seesaw pattern across the equatorial Pacific during ENSO cycles. This phenomenon has been attributed to two different physical processes. During El Nino(La Nina),the barrier layer(BL) is anomalously thin(thick) west of about 160°E, and thick(thin) to the east. In the western equatorial Pacific(the western part: 130°–160°E), interannual variations of the BLT indicate a lead of one year relative to those of the ENSO onset. The interannual variations of the BLT can be largely attributed to the interannual temperature variability, through its dominant effect on the isothermal layer depth(ILD). However, in the central equatorial Pacific(the eastern part: 160°E–170°W), interannual variations of the BL almost synchronously vary with ENSO, with a lead of about two months relative to those of the local SST. In this region, the interannual variations of the BL are significantly affected by the interannually varying salinity, mainly through its modulation effect on the mixed layer depth(MLD). As evaluated by a one-dimensional boundary layer ocean model, the BL around the dateline induced by interannual salinity anomalies can significantly affect the temperature fields in the upper ocean, indicating a positive feedback that acts to enhance ENSO.
关键词	barrier layer,salinity effect,ENSO,Argo
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	P731.12
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 (Grant No.2012CB955202) ; the National Natural Science Foundation of China (Grant No.41176014)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/190478
专题	中国科学院海洋研究所
作者单位	1.InternationalCenterforClimateandEnvironmentScienceInstituteofAtmosphericPhysics,ChineseAcademyofSciences 2.KeyLaboratoryofOceanCirculationandWavesInstituteofOceanology,ChineseAcademyofSciences 3.EarthSystemScienceInterdisciplinaryCenter,UniversityofMaryland,CollegePark,Maryland20740,USA
推荐引用方式 GB/T 7714	ZHENG Fei,ZHANG Rong-Hua,ZHU Jiang. Effects of Interannual Salinity Variability on the Barrier Layer in the Western-Central Equatorial Pacific:A Diagnostic Analysis from Argo. 2014.