Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean
文献类型：CNKI期刊论文
| 作者 | Feng JQ(冯俊乔); Bai XZ(白学志); Chen YL(陈永利); Hu DX(胡敦欣) |
| 发表日期 | 2010-04-15 |
| 出处 | Chinese Journal of Oceanology and Limnology
 |
| 关键词 | Rossby wave vertical baroclinic mode Argo sea surface height anomaly (SSHA) sea surface temperature anomaly (SSTA) |
| 英文摘要 | We investigate the influence of low-frequency Rossby waves on the thermal structure of the upper southwestern tropical Indian Ocean (SWTIO) using Argo profiles, satellite altimetric data, sea surface temperature, wind field data and the theory of linear vertical normal mode decomposition. Our results show that the SWTIO is generally dominated by the first baroclinic mode motion. As strong downwelling Rossby waves reach the SWTIO, the contribution of the second baroclinic mode motion in this region can be increased mainly because of the reduction in the vertical stratification of the upper layer above thermocline, and the enhancement in the vertical stratification of the lower layer under thermocline also contributes to it. The vertical displacement of each isothermal is enlarged and the thermal structure of the upper level is modulated, which is indicative of strong vertical mixing. However, the cold Rossby waves increase the vertical stratification of the upper level, restricting the variability related to the second baroclinic mode. On the other hand, during decaying phase of warm Rossby waves, Ekman upwelling and advection processes associated with the surface cyclonic wind circulation can restrain the downwelling processes, carrying the relatively colder water to the near-surface, which results in an out-of-phase phenomenon between sea surface temperature anomaly (SSTA) and sea surface height anomaly (SSHA) in the SWTIO. |
| 文献子类 | CNKI期刊论文 |
| 资助机构 | Supported by the National Natural Science Foundation of China (Nos. 40776013, 40306006) ; the State Key Basic Research Development Project (Nos. 2007CB411802, 2006CB403603) |
| 卷 | v.28期:02页:146-155 |
| 语种 | 英文; |
| 分类号 | P731 |
| ISSN号 | 0254-4059 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/192163]  |
| 专题 | 中国科学院海洋研究所 |
| 作者单位 | 1.KeyLaboratoryofOceanCirculationandWaves,ChineseAcademyofSciences 2.InstituteofOceanology,ChineseAcademyofSciences 3.GraduateUniversityofChineseAcademyofSciences |
| 推荐引用方式 GB/T 7714 | Feng JQ,Bai XZ,Chen YL,et al. Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean. 2010. |
入库方式： OAI收割
来源：海洋研究所
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