Diapycnal mixing variations induced by subthermocline eddies observed in the north Pacific western boundary region

doi:10.3389/fmars.2022.997599

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

	Diapycnal mixing variations induced by subthermocline eddies observed in the north Pacific western boundary region
	Nan, Feng 1,2,3,4,5; Xue, Huijie 5,6; Yu, Fei 1,2,3,4; Ren, Qiang 1,2,3; Wang, Jianfeng 1,2,3
刊名	FRONTIERS IN MARINE SCIENCE
	2022-10-24
卷号	9 页码:13
关键词	subthermocline eddy turbulent mixing shear western boundary region microstructure observations
DOI	10.3389/fmars.2022.997599
通讯作者	Nan, Feng(nanfeng0515@126.com) ; Yu, Fei(yuf@qdio.ac.cn)
英文摘要	Recent observations prove that subthermocline eddies (SEs) are energetic in the north Pacific western boundary region, where interhemispheric waters meet. Our previous study showed that the SEs play an important role in isopycnal mixing of interhemispheric intermediate waters. Whether the SEs can induce diapycnal mixing in the western boundary region is unknown although it has been found true in the interior region. In this study, based on in-situ observations and fine-scale parameterization method, we show spatial structure and variability of diapycnal mixing induced by the SEs in the north Pacific western boundary region. The SEs are located between 200 and 750 m with a maximum swirl speed reaching 0.5 m s(-1) and exhibit significant intra-seasonal variability with the period ranging between 50 and 100 days. Compared with shears induced by tides and near-inertial oscillation, sub-inertial shears induced by the SEs are dominant in the subthermocline layer. Consequently, diapycnal diffusivity is elevated up to O(10(-4)) m(2) s(-1) about one order higher than the background value when the SEs were passing by. The integrated diapycnal diffusivity between 200 and 750 m is increased by 210%. Modulated by the SEs, diapycnal mixing in the subthermocline has significant intra-seasonal variations. With more and more SEs being observed around the global oceans, we suggest that SE-induced mixing may not be trivial in closing the global ocean energy budget.
资助项目	National Natural Science Foundation of China[41676005] ; MEL Visiting Fellowship[MELRS2217] ; Youth Innovation Promotion Association of CAS ; Global Climate Changes and Air-sea Interaction Program[GASI-02-PAC-ST-Wwin]
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:000880633600001
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/180452]
专题	海洋研究所_海洋环流与波动重点实验室
通讯作者	Nan, Feng; Yu, Fei
作者单位	1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Wave Studies, Qingdao, Peoples R China 2.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China 3.Pilot Natl Lab Marine Sci & Technol, Qingdao, Peoples R China 4.Univ Chinese Acad Sci, Coll Earth Sci, Beijing, Peoples R China 5.Xiamen Univ, State Key Lab Marine Environm Sci, Xiamen, Peoples R China 6.Xiamen Univ, Coll Ocean & Earth Sci, Dept Phys Oceanog, Xiamen, Peoples R China
推荐引用方式 GB/T 7714	Nan, Feng,Xue, Huijie,Yu, Fei,et al. Diapycnal mixing variations induced by subthermocline eddies observed in the north Pacific western boundary region[J]. FRONTIERS IN MARINE SCIENCE,2022,9:13.
APA	Nan, Feng,Xue, Huijie,Yu, Fei,Ren, Qiang,&Wang, Jianfeng.(2022).Diapycnal mixing variations induced by subthermocline eddies observed in the north Pacific western boundary region.FRONTIERS IN MARINE SCIENCE,9,13.
MLA	Nan, Feng,et al."Diapycnal mixing variations induced by subthermocline eddies observed in the north Pacific western boundary region".FRONTIERS IN MARINE SCIENCE 9(2022):13.