Modulation of El Nino-Southern Oscillation by freshwater flux and salinity variability in the tropical Pacific
文献类型：期刊论文
| 作者 | Zhang Ronghua
|
| 刊名 | ADVANCES IN ATMOSPHERIC SCIENCES
 |
| 出版日期 | 2012-07 |
| 卷号 | 29期号:4页码:647-660 |
| 关键词 | freshwater flux (FWF) forcing and feedback sea surface salinity (SSS) variability ENSO modulation coupled ocean-atmosphere models |
| 中文摘要 | 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-08-28 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/18185]  |
| 专题 | 海洋研究所_海洋环流与波动重点实验室 |
| 推荐引用方式 GB/T 7714 | Zhang Ronghua. 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.(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."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. |
入库方式： OAI收割
来源：海洋研究所
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