IOCAS-IR  > 海洋环流与波动重点实验室
Effect of potential vorticity flux on the circulation in the South China Sea
Zhu, Yaohua1,2; Sun, Junchuan1,2; Wang, Yonggang1,2; Wei, Zexun1,2; Yang, Dezhou3; Qu, Tangdong1,4
2017-08-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume122Issue:8Pages:6454-6469
SubtypeArticle
AbstractThis 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.
KeywordPotential Vorticity Circulation South China Sea Density Layers
DOI10.1002/2016JC012375
Indexed BySCI
Language英语
WOS IDWOS:000410790600023
Citation statistics
Document Type期刊论文
Version出版稿
Identifierhttp://ir.qdio.ac.cn/handle/337002/143217
Collection海洋环流与波动重点实验室
Affiliation1.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
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.
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