Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean

doi:10.1007/s00343-010-9264-2

IOCAS-IR > 海洋环流与波动重点实验室

	Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean
	Feng Junqiao 1,2,3; Bai Xuezhi 1,2; Chen Yongli 1,2; Hu Dunxin 1,2; [email protected]
	2010-03-01
发表期刊	CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
卷号	28 期号:2 页码:344-353
文章类型	Article
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.; 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.
关键词	Rossby Wave Vertical Baroclinic Mode Argo Sea Surface Height Anomaly (Ssha) Sea Surface Temperature Anomaly (Ssta)
DOI	10.1007/s00343-010-9264-2
收录类别	SCI
语种	英语
WOS记录号	WOS:000275781400021
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/115
专题	海洋环流与波动重点实验室
通讯作者	[email protected]
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋研究所; 海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Feng Junqiao,Bai Xuezhi,Chen Yongli,et al. Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2010,28(2):344-353.
APA	Feng Junqiao,Bai Xuezhi,Chen Yongli,Hu Dunxin,[email protected].(2010).Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,28(2),344-353.
MLA	Feng Junqiao,et al."Effect of low-frequency Rossby wave on thermal structure of the upper southwestern tropical Indian Ocean".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 28.2(2010):344-353.

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