Observed three-dimensional structure of a cold eddy in the southwestern South China Sea

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	Observed three-dimensional structure of a cold eddy in the southwestern South China Sea
	Hu, Jianyu ; Gan, Jianping ; Sun, Zhenyu ; Zhu, Jia ; Dai, Minhan ; Dai MH(戴民汉)
刊名	http://dx.doi.org/10.1029/2010JC006810
	2011-05-24
关键词	UPPER-LAYER CIRCULATION ALTIMETER DATA GASPE CURRENT VARIABILITY SUMMER EDDIES SEPARATION ALASKA OCEAN
英文摘要	National Basic Research Program of China [2009CB421208]; Natural Science Foundation of China [40821063, 40521003]; Programme of Introducing Talents of Discipline to Universities [B07034]; Research Grants Council of Hong Kong [CERG 601009]; The dynamic structure of an ocean eddy in the eddy-abundant South China Sea has rarely been captured by measurements and has seldom been discussed in the literature. In the present study, in situ current and hydrographic measurements from a weeklong cruise and concurrent satellite altimeter observations were utilized to examine the three-dimensional structure and physical properties of a cold eddy in the southwestern South China Sea. The underlying forcing mechanism for the formation of this cyclonic cold eddy was found to be tightly associated with the recirculation in a coastal baroclinic jet that had separated off the Vietnamese coast. The eddy was significantly influenced by a coexisting, anticyclonic warm eddy in the separated jet. With relatively steady intensity and radius, the cold eddy endured for two weeks after its swift formation in late August and prior to its quick dissipation in mid-September. This cold eddy was horizontally and vertically heterogeneous. Asymmetric currents with much stronger magnitude were found on its southeastern flank, next to the warm eddy, where a front in the pycnocline was responsible for the sharp decrease in the cold eddy's intensity in the water below. The distributions of temperature, vorticity, and vertical velocity in the cold eddy were spatially asymmetric and not overlapping. The intensity of the cold eddy gradually decreased with the depth and the eddy extended downward for more than 250 m with a vertically tilted central axis. The upward velocities around the center of the eddy and the downward velocities to the southwest and to the east of the center jointly formed the upward domes of isotherms and isohalines in the central part of the cold eddy.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/60247]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Hu, Jianyu,Gan, Jianping,Sun, Zhenyu,et al. Observed three-dimensional structure of a cold eddy in the southwestern South China Sea[J]. http://dx.doi.org/10.1029/2010JC006810,2011.
APA	Hu, Jianyu,Gan, Jianping,Sun, Zhenyu,Zhu, Jia,Dai, Minhan,&戴民汉.(2011).Observed three-dimensional structure of a cold eddy in the southwestern South China Sea.http://dx.doi.org/10.1029/2010JC006810.
MLA	Hu, Jianyu,et al."Observed three-dimensional structure of a cold eddy in the southwestern South China Sea".http://dx.doi.org/10.1029/2010JC006810 (2011).