Deep Kinetic Energy Response to the Variability of the Kuroshio Extension

doi:10.1029/2024JC020951

IOCAS-IR > 海洋环流与波动重点实验室

	Deep Kinetic Energy Response to the Variability of the Kuroshio Extension
	Han, Jie-Hong 1,2,3,4,5; Xu, Yongsheng1,6,7,8 ; Huang, Chao1,7 ; Li, Jianping 3,4,5,6; Li, Kai-Yuan 9
	2024-10-01
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN	2169-9275
卷号	129 期号:10 页码:16
通讯作者	Xu, Yongsheng([email protected])
摘要	The transfer of energy from the upper to deep oceans is a well-known and challenging subject in physical oceanography. This research investigates the intricate relationship between surface and deep ocean currents. Utilizing nearly 2 years of observations from the Kuroshio Extension System Study (KESS), our study unveils the deep-ocean kinetic energy response to the Kuroshio Extension (KE) variability. We introduce the Kuroshio Extension Jet Path Index (KEJPI), which identifies two distinct modes of the KE jet on an intra-seasonal timescale. Our findings reveal a strong correlation (0.73) between KEJPI and the mean kinetic energy of deep-ocean geostrophic circulation, suggesting that the KE jet's large amplitude meanders have a significant impact on deep-ocean kinetic energy. Singular Value Decomposition (SVD) analysis further unveils a co-evolving spatial pattern between upper and lower ocean kinetic energy. We investigate the dynamic vertical coupling (DVC) mechanism by examining the coherent variation among the sea surface height (SSH), 15 degrees C isotherm (Z15), deep pressure anomaly, and abyssal flow. The KE jet migration can induce net divergence and convergence within the water column, which in turn generates deep-ocean quasi-geostrophic currents. These currents show a marked increase in kinetic energy, reaching levels three times higher than the background. This DVC-driven kinetic energy can further cascade into near-inertial and high-frequency internal waves, contributing to abyssal mixing. Our study underscores the role of large current system instabilities in transferring energy to the deep ocean and facilitating deep mixing processes. The transport of energy from the upper to deep oceans is a well-known and difficult topic in physical oceanography. However, the limit of observation on the deep-ocean circulations makes it the most uncertain process in the complex climate system. From 2004 to 2006, the Kuroshio Extension System Study used the in-situ measurement to investigate the characteristics and dynamics of the deep circulation at 5,300-6,400 m depth. The Kuroshio Extension (KE) jet exhibits two distinct modes, ranging from stable to unstable and back to stable during observations. The state of the KE jet has a strong impact on the variations and distributions of upper- and deep-ocean kinetic energy, indicating the coupled variation between the upper- and deep-ocean circulations. The deep-ocean kinetic energy increased to three times its original value when the KE jet became unstable. The co-volved process of sea surface height, vertical movement within the thermocline, deep-ocean pressure anomalies and deep-ocean kinetic energy is introduced to get insight into the underlying mechanism. Our research emphasizes the substantial influence of upper-ocean mesoscale processes on deep-ocean energy regulation. Furthermore, we identify potential hot spots for deep-ocean energy transfer and diapycnal mixing contributions, particularly in regions with robust ocean currents. Deep ocean kinetic energy shows significant response to KE jet variability Energy cascade can be promoted in the deep-sea kinetic energy response Dynamic vertical coupling mechanism is proposed to understand the response
DOI	10.1029/2024JC020951
收录类别	SCI
语种	英语
资助项目	Laoshan Laboratory science and technology innovation projects; NSFC-Shandong Joint Fund Key Project[U22A20587]; Innovative Practice Training Program of University of the National Academy of Sciences[Y5KY09101]; National Key Research and Development Program[2019YFC1509102]; National Natural Science Foundation of China[41676168]; National Natural Science Foundation of China[41906027]; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1406401]; [LSKJ202201406-2]
WOS研究方向	Oceanography
WOS类目	Oceanography
WOS记录号	WOS:001321559500001
出版者	AMER GEOPHYSICAL UNION
WOS关键词	GULF-STREAM ; MESOSCALE EDDIES ; BOTTOM PRESSURE ; INTERNAL WAVES ; DISSIPATION ; PROPAGATION ; CIRCULATION ; ATMOSPHERE ; PATTERNS ; MEANDERS
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/199196
专题	海洋环流与波动重点实验室
通讯作者	Xu, Yongsheng
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 2.Hong Kong Univ Sci & Technol, Ctr Ocean Res Hong Kong & Macau, Dept Ocean Sci, Hong Kong, Peoples R China 3.Ocean Univ China, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Qingdao, Peoples R China 4.Ocean Univ China, Key Lab Phys Oceanog, Qingdao, Peoples R China 5.Ocean Univ China, Acad Future Ocean, Qingdao, Peoples R China 6.Laoshan Lab, Qingdao, Peoples R China 7.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 8.Univ Chinese Acad Sci, Coll Marine Sci, Beijing, Peoples R China 9.Univ Calif Riverside, Dept Earth & Planetary Sci, Riverside, CA USA
推荐引用方式 GB/T 7714	Han, Jie-Hong,Xu, Yongsheng,Huang, Chao,et al. Deep Kinetic Energy Response to the Variability of the Kuroshio Extension[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2024,129(10):16.
APA	Han, Jie-Hong,Xu, Yongsheng,Huang, Chao,Li, Jianping,&Li, Kai-Yuan.(2024).Deep Kinetic Energy Response to the Variability of the Kuroshio Extension.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,129(10),16.
MLA	Han, Jie-Hong,et al."Deep Kinetic Energy Response to the Variability of the Kuroshio Extension".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 129.10(2024):16.