Vertical distribution of intraseasonal variation signals in the Kuroshio Current source area during 2018-2020

doi:10.3389/fmars.2024.1303565

IOCAS-IR > 海洋环流与波动重点实验室

	Vertical distribution of intraseasonal variation signals in the Kuroshio Current source area during 2018-2020
	Gong, Haobo 1,2; Wang, Fujun 2,3; Liu, Feng 1; Zhang, Linlin 2,3; Hu, Dunxin 2,3
	2024-01-22
发表期刊	FRONTIERS IN MARINE SCIENCE
卷号	11 页码:14
通讯作者	Wang, Fujun(fujunwang@qdio.ac.cn)
摘要	In the Kuroshio Current (KC) source area, intraseasonal variation (ISV) plays a significant role in dynamic oceanic processes. This study used data collected from three moorings (122.7 degrees E, 123 degrees E, 123.3 degrees E) along 18 degrees N from January 2018 to May 2020 to investigate the ISVs of meridional velocities. Notably, our findings reveal that the ISV above 200 m has a period of approximately 56 days and its intensity exhibits a gradual increase toward the west. For the 500-800 m depth interval, the ISV period is 73 days at 122.7 degrees E/18 degrees N and 60 days at 123.3 degrees E/18 degrees N. This discrepancy indicates that the ISVs have different vertical structures and frequencies at 122.7 degrees E and 123.3 degrees E along 18 degrees N. In particular, at 122.7 degrees E/18 degrees N, the distinctiveness of two different periods of ISVs in surface and subsurface layers was more pronounced in 2018 than in 2019. The analyses of eddy kinetic energy distribution and eddy tracking indicate a connection between ISV in stratification and locally generated mesoscale eddies in the KC source area. Specifically, the stronger eddy activity in 2018, in contrast with that in 2019, correlates with a more pronounced ISV. Energy analysis demonstrates a distinct positivity in the baroclinic conversion rate (BC) in the surface layer (upper 200 m) of the KC source region, surpassing the absolute value of the barotropic conversion rate (BT). This finding indicates a notable shift of energy from eddy available potential energy to eddy kinetic energy, strengthening the high-frequency ISV signals in this area. In the subsurface layer, a strong negative BT is observed west of 122.8 degrees E, with its absolute value exceeding the BC. This finding indicates that the energy is converted from eddy kinetic energy into mean kinetic energy, resulting in the appearance of the Luzon Undercurrent (LUC) at mooring station 122.7 degrees E/18 degrees N, characterized by a low frequency of ISV. Contrastingly, a positive BT plays a dominant role at 123.3 degrees E/18 degrees N, leading to the disappearance of the LUC amid an apparent presence of high-frequency ISV.
关键词	intraseasonal variation Kuroshio current eddy barotropic conversion baroclinic conversion
DOI	10.3389/fmars.2024.1303565
收录类别	SCI
语种	英语
资助项目	Laoshan Laboratory[LSKJ202201601] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42010105] ; National Key Research and Development Program of China[2020YFA0608801] ; NSFC Shiptime Sharing Project[LSKJ202201702] ; Project of Science and Technology Innovation of Laoshan Laboratory ; [42249909]
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
WOS类目	Environmental Sciences ; Marine & Freshwater Biology
WOS记录号	WOS:001156121300001
出版者	FRONTIERS MEDIA SA
WOS关键词	NORTH EQUATORIAL CURRENT ; WESTERN BOUNDARY CURRENTS ; INTERANNUAL VARIABILITY ; MESOSCALE EDDIES ; MINDANAO CURRENT ; SOUTH ; TRANSPORT ; SEA ; COUNTERCURRENT ; DYNAMICS
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/184417
专题	海洋环流与波动重点实验室
通讯作者	Wang, Fujun
作者单位	1.Shandong Univ Sci & Technol, Qingdao, Peoples R China 2.Inst Oceanol, Chinese Acad Sci, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 3.Lao Shan Lab, Qingdao, 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	Gong, Haobo,Wang, Fujun,Liu, Feng,et al. Vertical distribution of intraseasonal variation signals in the Kuroshio Current source area during 2018-2020[J]. FRONTIERS IN MARINE SCIENCE,2024,11:14.
APA	Gong, Haobo,Wang, Fujun,Liu, Feng,Zhang, Linlin,&Hu, Dunxin.(2024).Vertical distribution of intraseasonal variation signals in the Kuroshio Current source area during 2018-2020.FRONTIERS IN MARINE SCIENCE,11,14.
MLA	Gong, Haobo,et al."Vertical distribution of intraseasonal variation signals in the Kuroshio Current source area during 2018-2020".FRONTIERS IN MARINE SCIENCE 11(2024):14.