Three-dimensional circulation in northern South China Sea during early summer of 2015

Huiqun Wang Yaochu Yuan Weibing Guan Chenghao Yang Dongfeng Xu

Huiqun Wang, Yaochu Yuan, Weibing Guan, Chenghao Yang, Dongfeng Xu. Three-dimensional circulation in northern South China Sea during early summer of 2015[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1815-1
Citation: Huiqun Wang, Yaochu Yuan, Weibing Guan, Chenghao Yang, Dongfeng Xu. Three-dimensional circulation in northern South China Sea during early summer of 2015[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1815-1

doi: 10.1007/s13131-021-1815-1

Three-dimensional circulation in northern South China Sea during early summer of 2015

Funds: The Joint Project of Guangxi-Provincial and China-National Natural Science Foundations under contract No. U20A20104; the National Basic Research Program of China under contract No. 2014CB441501; the National Natural Science Foundation of China under contract Nos 41830540 and 42076216; Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) under contract No. 311020003; the Project of State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, under contract Nos SOEDZZ2101 and SOEDZZ2003.
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  • Figure  1.  Bottom topography (m) of the South China Sea and observation stations of the two surveys in June 2015. The dots denote the open cruise from 21 to 30 June 2015, and the triangles denote the slope cruise from 13 to 25 June 2015. The polygon connecting the exterior markers indicates the observational domain.

    Figure  2.  Temperature-salinity (T-S) diagram from all hydrographic stations of the two surveys. Black and red are used to distinguish the two surveys, while the monthly climatological profiles of observed temperature and salinity in June for the SCS (15°N, 115°E) and Pacific (15°N, 125°E) are in blue and purple, respectively. $ {\sigma }_{t} $ (kg/m3) is the density anomaly of a water sample when the total pressure on it has been reduced to atmospheric pressure.

    Figure  3.  Salinity distributions at surface (a), 50 m (b), 200 m (c), and 500 m (d) measured in June 2015. “HS” indicates higher-salinity water, “LS” indicates lower-salinity water, “D” indicates the Dongsha Islands, and purple contours indicate isobaths.

    Figure  4.  Temperature distributions at surface (a), 50 m (b), 200 m (c), and 500 m (d) measured in June 2015. “HS”indicates higher- temperature water, “LS” indicates lower- temperature water, “D” indicates the Dongsha Islands, and purple contours indicate isobaths.

    Figure  5.  Mean wind field derived from the ERA-Interim Reanalysis for the survey period. The polygon indicates the computational domain, and “D” indicates the Dongsha Islands.

    Figure  6.  Averaged weekly composite sea-level anomaly (m) from 9 to 29 June 2015. The polygon indicates the computational domain, and “D” indicates the Dongsha Islands.

    Figure  7.  Boxes of the modified inverse method and horizontal grid of the numerical model. The transports (106 m3/s) listed at the boundaries of the computational region were calculated using the modified inverse method.

    Figure  8.  Volume-averaged kinetic energy (a) and phase speed of density (b) as a function of time.

    Figure  9.  Sea-surface elevations (m) from the semi-diagnostic calculation. “W1” and “W2” indicate two eddies, and “C1” indicates the cold eddy.

    Figure  10.  Distributions of horizontal velocity from the semi-diagnostic calculation at surface (a), 25 m (b), 50 m (c), 100 m (d), 200 m (e), and 400 m (f). Red contours indicate isobaths, “W1” and “W2” indicate two eddies, and “C1” indicates the cold eddy.

    Figure  11.  Distribution of stream function and volume transport (106 m3/s) from the semi-diagnostic calculation. Red contours indicate isobaths, and “D” indicates the Dongsha Islands.

    Figure  12.  Transport per unit width (m2/s) for the semi-diagnostic calculation. Red contours indicate isobaths, and “D” indicates the Dongsha Islands.

    Figure  13.  Distributions of vorticity terms (s−2) near the Dongsha Islands during the early summer of 2015 from the semi-diagnostic calculation. Term I (JEBAR) (a), term II (b), and term III (c) on the right-hand side of Eq. (11). Red contours indicate isobaths, and “D” indicates the Dongsha Islands.

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  • 收稿日期:  2020-11-28
  • 录用日期:  2021-01-17
  • 网络出版日期:  2021-06-28

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