Modulation of El Nino-Southern Oscillation by freshwater flux and salinity variability in the tropical Pacific

IOCAS-IR > 海洋环流与波动重点实验室

	Modulation of El Nino-Southern Oscillation by freshwater flux and salinity variability in the tropical Pacific
	Zhang Ronghua; Zheng Fei; Zhu Jieshun; Pei Yuhua; Zheng Quanan; Wang Zhanggui
	2012-07
发表期刊	ADVANCES IN ATMOSPHERIC SCIENCES
卷号	29 期号:4 页码:647-660
摘要	The El Nio-Southern Oscillation (ENSO) is modulated by many factors; most previous studies have emphasized the roles of wind stress and heat flux in the tropical Pacific. Freshwater flux (FWF) is another environmental forcing to the ocean; its effect and the related ocean salinity variability in the ENSO region have been of increased interest recently. Currently, accurate quantifications of the FWF roles in the climate remain challenging; the related observations and coupled ocean-atmosphere modeling involve large elements of uncertainty. In this study, we utilized satellite-based data to represent FWF-induced feedback in the tropical Pacific climate system; we then incorporated these data into a hybrid coupled ocean-atmosphere model (HCM) to quantify its effects on ENSO. A new mechanism was revealed by which interannual FWF forcing modulates ENSO in a significant way. As a direct forcing, FWF exerts a significant influence on the ocean through sea surface salinity (SSS) and buoyancy flux (Q (B)) in the western-central tropical Pacific. The SSS perturbations directly induced by ENSO-related interannual FWF variability affect the stability and mixing in the upper ocean. At the same time, the ENSO-induced FWF has a compensating effect on heat flux, acting to reduce interannual Q (B) variability during ENSO cycles. These FWF-induced processes in the ocean tend to modulate the vertical mixing and entrainment in the upper ocean, enhancing cooling during La Nia and enhancing warming during El Nio, respectively. The interannual FWF forcing-induced positive feedback acts to enhance ENSO amplitude and lengthen its time scales in the tropical Pacific coupled climate system.
关键词	Freshwater Flux (Fwf) Forcing And Feedback Sea Surface Salinity (Sss) Variability Enso Modulation Coupled Ocean-atmosphere Models
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/18185
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Zhang Ronghua,Zheng Fei,Zhu Jieshun,et al. Modulation of El Nino-Southern Oscillation by freshwater flux and salinity variability in the tropical Pacific[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2012,29(4):647-660.
APA	Zhang Ronghua,Zheng Fei,Zhu Jieshun,Pei Yuhua,Zheng Quanan,&Wang Zhanggui.(2012).Modulation of El Nino-Southern Oscillation by freshwater flux and salinity variability in the tropical Pacific.ADVANCES IN ATMOSPHERIC SCIENCES,29(4),647-660.
MLA	Zhang Ronghua,et al."Modulation of El Nino-Southern Oscillation by freshwater flux and salinity variability in the tropical Pacific".ADVANCES IN ATMOSPHERIC SCIENCES 29.4(2012):647-660.

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