Research on mid-depth current of basin scale in the South China Sea based on historical Argo observations

Wang Xiaohui; Zhang Weimin; Wang Pinqiang; Yang Jun; Wang huizan

doi:10.3969/j.issn.0253-4193.2018.06.001

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Wang Xiaohui, Zhang Weimin, Wang Pinqiang, Yang Jun, Wang huizan. Research on mid-depth current of basin scale in the South China Sea based on historical Argo observations[J]. Haiyang Xuebao, 2018, 40(6): 1-14. doi: 10.3969/j.issn.0253-4193.2018.06.001

Citation:

Wang Xiaohui, Zhang Weimin, Wang Pinqiang, Yang Jun, Wang huizan. Research on mid-depth current of basin scale in the South China Sea based on historical Argo observations[J]. Haiyang Xuebao, 2018, 40(6): 1-14. doi: 10.3969/j.issn.0253-4193.2018.06.001

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Research on mid-depth current of basin scale in the South China Sea based on historical Argo observations

doi: 10.3969/j.issn.0253-4193.2018.06.001

1.
Institute of Meteorology and Oceanography, National University of Defense Technology, Changsha 410072, China;College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410072, China
2.
Institute of Meteorology and Oceanography, National University of Defense Technology, Changsha 410072, China
3.
College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410072, China
4.
Institute of Meteorology and Oceanography, National University of Defense Technology, Changsha 410072, China;State Key Laboratory of Satellite Ocean Environment Dynamics, Hangzhou 310012, China

Received Date: 2017-07-20
Rev Recd Date: 2017-12-18

Abstract

Abstract

According to the state of art of South China Sea (SCS) which is with complex currents environment and a small number of mid-depth observations, a gridding seasonal velocity field is generated via Divand variational interpolation method using mid-depth velocity data of 1200 m derived from the satellite positioning of 114 Argo profiling floats deployed in SCS from 2006 to 2016 using the method of least square and based on the background and inertial currents. The conclusions could be drawn as follows. (1) Velocity trajectory of one single Argo profiling float could describe the concrete structure of the mesoscale phenomenon, e.g. the anti-cyclonic mesoscale eddy at the mid-depth (1 200 m) off the Vietnam east coast which has a radius of 120 km, a maximum current velocity of 9.6 cm/s and a average current velocity of 5.3 cm/s. (2) The gridding seasonal currents field generated from Argo demonstrates that the mid-depth current of basin scale has the anti-cyclonic structure in southern part of SCS and cyclonic structure in northern part. Meanwhile, there exists water exchange from SCS to the Pacific Ocean through Luzon Strait. (3) The generated gridding seasonal currents field is highly consistent with HYCOM Reanalysis and YoMaHa'07 data. Comparing the generated currents field with HYCOM Reanalysis data, the distribution of the departure of the two is normal, while the root mean square error of zonal component of the velocity of the currents is 3.28 cm/s and the counterpart of the meridional component is 3.26 cm/s. All in all, the features of the basin scale mid-depth circulation in SCS could be efficiently retrieved by the Argo trajectory data.
- South China Sea,
- Argo trajectory,
- mid-depth,
- basin scale,
- current circulation structure

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References(34)

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