Ocean mixing induced by three-dimensional structure of equatorial mode tropical instability waves in the Pacific Ocean

doi:10.3389/fmars.2023.1228897

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	Ocean mixing induced by three-dimensional structure of equatorial mode tropical instability waves in the Pacific Ocean
	Fang, Liyuan 1,3; Ma, Kai 3; Liu, Chuanyu 2,3; Wang, Xiaowei 3; Wang, Fan 2,3
刊名	FRONTIERS IN MARINE SCIENCE
	2023-10-25
卷号	10 页码:14
关键词	tropical instability wave three-dimensional structures stratification shear reduced shear squared mixing equatorial Pacific
DOI	10.3389/fmars.2023.1228897
通讯作者	Liu, Chuanyu(chuanyu.liu@qdio.ac.cn)
英文摘要	Observations have revealed that tropical instability waves (TIWs) play an important role in the ocean mixing of the equatorial thermocline. However, most studies have not distinguished the individual effects from the TIWs' two modes, and most of them focused on the effect of the TIW-induced vertical shear on the formation of mixing. In this study, we utilize the high-resolution ocean reanalysis data to isolate the 3D structure of the equatorial mode of TIW (eTIW) and examine the detailed mechanisms of its mixing effects. Horizontally, the temperature associated with the eTIWs shows a centrosymmetric structure in the upper layers, but vertically, the phase begins to transition at similar to 70 and becomes opposite to that of the upper layer below 90 m. The centrosymmetric temperature structure leads to a similar stratification pattern in the upper layers. We find that the pattern of the eTIW-associated reduced shear squared (RSS), an indicator for potential shear instability, is controlled by its stratification rather than shear, suggesting that the former plays a more important role than the latter in resulting in shear instability and mixing. Specifically, it is in the northern (southern) part of the clockwise (anticlockwise) phase of the eTIWs that the eTIW-associated RSS is positively large, where the total flow is more likely to be modulated by shear instability and mixing. Hence, the present study provides a new mechanism for the TIW-induced mixing in the equatorial thermocline. However, in specific regions where the eTIW-induced shear has the same sign as that of the mean flow, the eTIW-associated shear squared can also significantly enhance the total RSS and lead to shear instability, consistent with previous studies.
资助项目	National Natural Science Foundation of China (NSFC)[41976012] ; National Natural Science Foundation of China (NSFC)[E12117106B] ; Key Research Program of Laoshan Laboratory[LSKJ202202502] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42000000]
WOS关键词	DEEP-CYCLE TURBULENCE ; SALINITY
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
语种	英语
出版者	FRONTIERS MEDIA SA
WOS记录号	WOS:001102277500001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/183987]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Liu, Chuanyu
作者单位	1.Shijiazhuang Tiedao Univ, Dept Math & Phys, Shijiazhuang, Peoples R China 2.Laoshan Lab, Qingdao, Peoples R China 3.Chinese Acad Sci IOCAS, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
推荐引用方式 GB/T 7714	Fang, Liyuan,Ma, Kai,Liu, Chuanyu,et al. Ocean mixing induced by three-dimensional structure of equatorial mode tropical instability waves in the Pacific Ocean[J]. FRONTIERS IN MARINE SCIENCE,2023,10:14.
APA	Fang, Liyuan,Ma, Kai,Liu, Chuanyu,Wang, Xiaowei,&Wang, Fan.(2023).Ocean mixing induced by three-dimensional structure of equatorial mode tropical instability waves in the Pacific Ocean.FRONTIERS IN MARINE SCIENCE,10,14.
MLA	Fang, Liyuan,et al."Ocean mixing induced by three-dimensional structure of equatorial mode tropical instability waves in the Pacific Ocean".FRONTIERS IN MARINE SCIENCE 10(2023):14.