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    Observational and model studies of the circulation in the Gulf of Tonkin, South China Sea

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    Date
    2013-12-03
    Author
    Ding, Yang  Concept link
    Chen, Changsheng  Concept link
    Beardsley, Robert C.  Concept link
    Bao, Xianwen  Concept link
    Shi, Maochong  Concept link
    Zhang, Yu  Concept link
    Lai, Zhigang  Concept link
    Li, Ruixiang  Concept link
    Lin, Huichan  Concept link
    Viet, Nguyen Trung  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6478
    As published
    https://doi.org/10.1002/2013JC009455
    DOI
    10.1002/2013JC009455
    Keyword
     Current measurements; Circulation; Numerical modeling 
    Abstract
    Moored current measurements were made at one mooring site in the northern Gulf of Tonkin for about 1 year during 1988–1989. Analyses were performed to examine characteristics and variability of tidal and subtidal flows. Rotary spectra showed two peaks at diurnal and semidiurnal periods, with higher diurnal energy. Complex demodulations of diurnal and semidiurnal tidal currents indicated that the tidal current magnitudes varied significantly with seasons: more energetic in the stratified summer than in the vertically well-mixed winter. The observed subtidal currents were highly correlated with the surface wind in winter but not in summer; challenging the conceptual summertime anticyclonic circulation pattern derived using wind-driven homogenous circulation theory. The computed currents from a global ocean model were in good agreement with the observed currents. Similar to the current observations, the model-computed flow patterns were consistent with the conceptual wind-driven circulation pattern in winter but opposite in summer. Process-oriented experiments suggest that the summertime cyclonic circulation in the northern Gulf of Tonkin forms as a result of the combination of stratified wind-driven circulation and tidal-rectified inflow from Qiongzhou Strait. The interaction between the southwest monsoon and buoyancy-driven flow from Hong River can significantly intensify the cyclonic circulation near the surface, but its contribution to the vertically averaged flow of the cyclonic circulation is limited.
    Description
    Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 118 (2013): 6495–6510, doi:10.1002/2013JC009455.
    Collections
    • Physical Oceanography (PO)
    Suggested Citation
    Journal of Geophysical Research: Oceans 118 (2013): 6495–6510
     

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