Deformation of a Warm Eddy in the Northern South China Sea

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	Deformation of a Warm Eddy in the Northern South China Sea
	Mao, Huabin 5; Lian, Shumin 5; Ouyang, Juan 6,7; Su, Danyi 6,7; Yu JC(俞建成)1 ; Xie, Qiang 2; Liu, Hailong 3,4; Qiu CH(邱春华)6,7
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2019
卷号	124 期号:8 页码:5551-5564
关键词	deformation submesoscale eddies Chinese underwater glider baroclinic instability
ISSN号	2169-9275
产权排序	5
英文摘要	Mesoscale eddies are important for regulating oceanic energy. Variation in eddy shapes leads to uncertainty in calculations of heat or energy content. In this study, we investigated the deformation of a warm eddy in the northern South China Sea from April to June 2018 and elucidated the mechanism governing the deformation. Satellite altimetry images showed that the warm eddy originated from Luzon Strait (LS eddy), migrated westward, and then moved along 500-m isobaths until it approached the east of Hainan Island. Thereafter, the LS eddy deformed, moved southward, merged with other eddies, and finally dissipated. Using ship and virtual-mooring Chinese underwater glider observations, we examined the three-dimensional structure of the LS eddy. The warm eddy had a low-density core that reached a depth of 250 m. The LS eddy gave rise to a front along its eastern edge, and two associate submesoscale eddies with horizontal radii of approximately 10 km were found at the front. The warm eddy was circular before deformation but morphed into an egg shape after deformation. This shape change allowed the eddy to entrain additional water mass (approximately 10(14) kg). The deformation event was able to be forecasted by the vorticity and deformation index, as the eddy deformed by leaking into the zone with a high vorticity and deformation index. We used modeling and energy transformation calculations to analyze the mechanism of the warm eddy deformation. Our results revealed that baroclinic instability played a primary role in the deformation event.
语种	英语
WOS记录号	WOS:000490464200012
资助机构	National Key RD Plan of China [2017YFC0305904, 2017YFC0305804, 2016YFC0301201]
内容类型	期刊论文
源URL	[http://ir.sia.cn/handle/173321/25777]
专题	海洋机器人卓越创新中心
作者单位	1.Shenyang institute of automation, Chinese Academy of Sciences, Shenyang, China 2.Institute of Deep‐Sea Science of Engineering, Chinese Academy of Sciences, Sanya, China 3.College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China 4.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China 5.State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China 6.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, China 7.The Center for Coastal Ocean Science and Technology, School of Marine Sciences, Sun Yat‐sen University, Guangzhou, China
推荐引用方式 GB/T 7714	Mao, Huabin,Lian, Shumin,Ouyang, Juan,et al. Deformation of a Warm Eddy in the Northern South China Sea[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2019,124(8):5551-5564.
APA	Mao, Huabin.,Lian, Shumin.,Ouyang, Juan.,Su, Danyi.,Yu JC.,...&Qiu CH.(2019).Deformation of a Warm Eddy in the Northern South China Sea.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,124(8),5551-5564.
MLA	Mao, Huabin,et al."Deformation of a Warm Eddy in the Northern South China Sea".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 124.8(2019):5551-5564.