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题名: Effect of potential vorticity flux on the circulation in the South China Sea
作者: Zhu, Yaohua1,2; Sun, Junchuan1,2; Wang, Yonggang1,2; Wei, Zexun1,2; Yang, Dezhou3; Qu, Tangdong1,4
刊名: JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
出版日期: 2017-08-01
卷号: 122, 期号:8, 页码:6454-6469
关键词: potential vorticity ; circulation ; South China Sea ; density layers
DOI: 10.1002/2016JC012375
文章类型: Article
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.
收录类别: SCI
语种: 英语
WOS记录号: WOS:000410790600023
Citation statistics:
内容类型: 期刊论文
版本: 出版稿
URI标识: http://ir.qdio.ac.cn/handle/337002/143217
Appears in Collections:海洋环流与波动重点实验室_期刊论文

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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

Recommended Citation:
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.
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