Effect of potential vorticity flux on the circulation in the South China Sea

doi:10.1002/2016JC012375

CORC > 自然资源部第一海洋研究所 > 自然资源部第一海洋研究所 > 业务部门 > 海洋环境与数值模拟研究室

	Effect of potential vorticity flux on the circulation in the South China Sea
	Zhu, Yaohua 1,2; Sun, Junchuan 1,2; Wang, Yonggang 1,2; Wei, Zexun 1,2; Yang, Dezhou 3; Qu, Tangdong 1,4
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
	2017-08
卷号	122 期号:8 页码:6454-6469
关键词	potential vorticity circulation South China Sea density layers
ISSN号	2169-9275
DOI	10.1002/2016JC012375
英文摘要	This study analyzes temperature and salinity products from the U.S. Navy Generalized Digital Environment Model. To avoid the fictitious assumption of no-motion reference level, a P-vector inverse method is employed to derive geostrophic velocity. Line integral of geostrophic velocity shows evidence for the existence of a sandwiched circulation in the South China Sea (SCS), i.e., cyclonic circulation in the subsurface and deep layers and anticyclonic in the intermediate layer. To reveal the factors responsible for the sandwiched circulation, we derive the potential vorticity equation based on a four-and-a-half-layer quasi-geostrophic model and apply theoretical potential vorticity constraint to density layers. The result shows that the sandwiched circulation is largely induced by planetary potential vorticity flux through lateral boundaries, mainly the Luzon Strait. This dynamical mechanism lies in the fact that the net potential vorticity inflow in the subsurface and deep layers leads to a positive layer-average vorticity in the SCS basin, yielding vortex stretching and a cyclonic basin-wide circulation. On the contrary, the net potential vorticity outflow in the intermediate layer induces a negative layer-average vorticity, generating an anticyclonic basin-wide circulation in the SCS. Furthermore, by illustrating different consequence from depth/density layers, we clarify that density layers are essential for applying theoretical potential vorticity constraint to the isolated deep SCS basin.
资助项目	National Natural Science Foundation of China[41606040] ; National Natural Science Foundation of China[41476025]
WOS研究方向	Oceanography
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000410790600023
内容类型	期刊论文
源URL	[http://ir.fio.com.cn/handle/2SI8HI0U/3118]
专题	业务部门_海洋环境与数值模拟研究室
作者单位	1.State Ocean Adm, Inst Oceanog 1, Key Lab Marine Sci & Numer Modeling, Qingdao, Peoples R China; 2.Qingdao Natl Lab Marine Sci & Technol, Lab Reg Oceanog & Numer Modeling, Qingdao, Peoples R China; 3.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China; 4.Univ Calif Los Angeles, Joint Inst Reg Earth Syst Sci & Engn, Los Angeles, CA USA
推荐引用方式 GB/T 7714	Zhu, Yaohua,Sun, Junchuan,Wang, Yonggang,et al. Effect of potential vorticity flux on the circulation in the South China Sea[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2017,122(8):6454-6469.
APA	Zhu, Yaohua,Sun, Junchuan,Wang, Yonggang,Wei, Zexun,Yang, Dezhou,&Qu, Tangdong.(2017).Effect of potential vorticity flux on the circulation in the South China Sea.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,122(8),6454-6469.
MLA	Zhu, Yaohua,et al."Effect of potential vorticity flux on the circulation in the South China Sea".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 122.8(2017):6454-6469.