Geostrophic Spirals Generated by the Horizontal Diffusion of Vortex Stretching in the Yellow Sea

doi:10.1007/s00376-018-8091-9

	Geostrophic Spirals Generated by the Horizontal Diffusion of Vortex Stretching in the Yellow Sea
	Song, Xiangzhou 1,4; Huang, Rui Xin 2; Wu, Dexing 1; Qiao, Fangli 3; Wang, Guansuo 3
刊名	ADVANCES IN ATMOSPHERIC SCIENCES
	2019-02
卷号	36 期号:2 页码:219-230
关键词	geostrophic spirals horizontal diffusion vortex stretching and surface cooling effect
ISSN号	0256-1530
DOI	10.1007/s00376-018-8091-9
英文摘要	Horizontal velocity spirals with a clockwise rotation (downward looking) rate of 1.7 degrees m(-1), on average, were observed in the western and northern Yellow Sea from December 2006 to February 2007. With the observed thermal wind relation, the beta-spiral theory was used to explain the dynamics of spirals. It was found that the horizontal diffusion of geostrophic vortex stretching is likely to be a major mechanism for generating geostrophic spirals. Vertical advection associated with surface/bottom Ekman pumping and topography-induced upwelling is too weak to support these spirals. Strong wind stirring and large heat loss in wintertime lead to weak stratification and diminish the effects of vertical advection. The cooling effect and vertical diffusion are offset by an overwhelming contribution of horizontal diffusion in connection with vortex stretching. The Richardson number-dependent vertical eddy diffusivity reaches a magnitude of 10(-4) m(2) s(-1) on average. An eddy diffusivity of 2870 m(2) s(-1) is required for dynamic balance by estimating the residual term. This obtained value of 10(-4) m(2) s(-1) is in good agreement with the estimation in terms of observed eddy activities. The suppressed and unsuppressed diffusivities in the observation region are 2752 and 2881 m2 s(-1), respectively, which supports a closed budget for velocity rotation.
资助项目	Natural Science Foundation of Shandong[BS2013HZ015]
WOS关键词	BETA ; CURRENTS ; FLUXES
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000452950100008
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/25695]
专题	自然资源部第一海洋研究所
通讯作者	Song, Xiangzhou
作者单位	1.Ocean Univ China, Phys Oceanog Lab, Qingdao 266003, Peoples R China 2.Woods Hole Oceanog Inst, Dept Phys Oceanog, Woods Hole, MA 02543 USA 3.State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Peoples R China 4.State Ocean Adm, Minist Nat Resources, Beijing 100860, Peoples R China
推荐引用方式 GB/T 7714	Song, Xiangzhou,Huang, Rui Xin,Wu, Dexing,et al. Geostrophic Spirals Generated by the Horizontal Diffusion of Vortex Stretching in the Yellow Sea[J]. ADVANCES IN ATMOSPHERIC SCIENCES,2019,36(2):219-230.
APA	Song, Xiangzhou,Huang, Rui Xin,Wu, Dexing,Qiao, Fangli,&Wang, Guansuo.(2019).Geostrophic Spirals Generated by the Horizontal Diffusion of Vortex Stretching in the Yellow Sea.ADVANCES IN ATMOSPHERIC SCIENCES,36(2),219-230.
MLA	Song, Xiangzhou,et al."Geostrophic Spirals Generated by the Horizontal Diffusion of Vortex Stretching in the Yellow Sea".ADVANCES IN ATMOSPHERIC SCIENCES 36.2(2019):219-230.