Persistent mixing bursts in the equatorial Pacific thermocline induced by persistent equatorial waves

doi:10.1007/s00343-023-2350-z

IOCAS-IR > 海洋环流与波动重点实验室

	Persistent mixing bursts in the equatorial Pacific thermocline induced by persistent equatorial waves
	Zhang, Jingjing 1,2; Liu, Chuanyu 2,3; Gong, Xiang 1; Wang, Fan2,3
	2024-02-28
发表期刊	JOURNAL OF OCEANOLOGY AND LIMNOLOGY
ISSN	2096-5508
页码	19
通讯作者	Liu, Chuanyu(chuanyu.liu@qdio.ac.cn)
摘要	A recent study by Liu et al. (2020) suggested that due to the saturation of equatorially trapped planetary waves with different dynamical types, temporal periods, meridional and baroclinic modes, complex layer structures of vertical velocity shear and hence turbulent mixing could frequently occur in the thermocline of the eastern equatorial Pacific. We investigated the occurrence of the interior turbulent mixing as indicated by shear instabilities, above the Equatorial Undercurrent (EUC) core at three equatorial sites along 140 degrees W, 170 degrees W, and 165 degrees E, respectively, based mainly on data from the Tropical Atmosphere and Ocean (TAO) mooring array. We found that turbulent mixing bursts persisted in the thermocline of all three sites. Specifically, the interior turbulent mixing layers (ITMLs) could occur in probability of approximately 68%, 53%, and 48% at the three sites, respectively. The overall occurrence probability shows obvious and similar biannual variations at 140 degrees W and 170 degrees W, which is higher in boreal from late summer to winter and lower in spring. Vertically, the ITMLs are primarily located above the EUC core and prevail in deeper (shallower) layers from late summer to winter (spring). Most ITMLs (70%) lasted for hours to 3 days, and a few of them (15%) for more than 7 days. The thicknesses of ITMLs were concentrated between 15 and 55 m. At 165 degrees E, the vertical distribution of ITML occurrence probability was different from that at 140 degrees W and 170 degrees W, as it did not show a preference for depths; the durations of ITMLs are short (also from hours to several days) and their thicknesses were between 5 and 25 m. These properties, particularly the high occurrence probability, and short durations demonstrated the persistence of thermocline mixing in the western to eastern equatorial Pacific thermocline and confirmed the generation mechanism by persistent equatorial waves as well.
关键词	interior turbulent mixing layer (ITML) weakly sheared layer (WSL) Equatorial Undercurrent (EUC) core occurrence probability seasonality
DOI	10.1007/s00343-023-2350-z
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China (NSFC)[41730534] ; Laoshan Laboratory Science and Technology Innovation Program[LSKJ202202502] ; NSFC[41976012] ; NSFC[42090044] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB42000000]
WOS研究方向	Marine & Freshwater Biology ; Oceanography
WOS类目	Limnology ; Oceanography
WOS记录号	WOS:001174232300002
出版者	SCIENCE PRESS
WOS关键词	DEEP-CYCLE TURBULENCE ; SHEAR ; INSTABILITY ; OCEAN ; VARIABILITY ; SCALE ; LAYER
引用统计	被引频次：1[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/337002/184927
专题	海洋环流与波动重点实验室
通讯作者	Liu, Chuanyu
作者单位	1.Qingdao Univ Sci & Technol, Sch Math & Phys, Qingdao 266100, Peoples R China 2.Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Inst Oceanol, Qingdao 266071, Peoples R China 3.Laoshan Lab, Qingdao 266237, Peoples R China
第一作者单位	海洋环流与波动重点实验室
通讯作者单位	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Zhang, Jingjing,Liu, Chuanyu,Gong, Xiang,et al. Persistent mixing bursts in the equatorial Pacific thermocline induced by persistent equatorial waves[J]. JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2024:19.
APA	Zhang, Jingjing,Liu, Chuanyu,Gong, Xiang,&Wang, Fan.(2024).Persistent mixing bursts in the equatorial Pacific thermocline induced by persistent equatorial waves.JOURNAL OF OCEANOLOGY AND LIMNOLOGY,19.
MLA	Zhang, Jingjing,et al."Persistent mixing bursts in the equatorial Pacific thermocline induced by persistent equatorial waves".JOURNAL OF OCEANOLOGY AND LIMNOLOGY (2024):19.