The study of the trends of tidal amplitudes of major constituents in the South China Sea

Pan Haidong; Wang Yuzhe; Lü Xianqing

doi:10.12284/hyxb2021096

Volume 43 Issue 6

Jun. 2021

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Pan Haidong，Wang Yuzhe，Lü Xianqing. The study of the trends of tidal amplitudes of major constituents in the South China Sea[J]. Haiyang Xuebao，2021, 43(6)：26–34 doi: 10.12284/hyxb2021096

Citation:

Pan Haidong，Wang Yuzhe，Lü Xianqing. The study of the trends of tidal amplitudes of major constituents in the South China Sea[J]. Haiyang Xuebao，2021, 43(6)：26–34 doi: 10.12284/hyxb2021096

Citation:

Pan Haidong，Wang Yuzhe，Lü Xianqing. The study of the trends of tidal amplitudes of major constituents in the South China Sea[J]. Haiyang Xuebao，2021, 43(6)：26–34 doi: 10.12284/hyxb2021096

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The study of the trends of tidal amplitudes of major constituents in the South China Sea

doi: 10.12284/hyxb2021096

Key Laboratory of Physical Oceanography, Ministry of Education, Ocean University of China, Qingdao 266100, China

Received Date: 2020-06-20
Rev Recd Date: 2020-08-26

Available Online: 2021-03-30

Publish Date: 2021-06-30

Abstract

Abstract

The study of tidal changes is of great significance in marine engineering, marine mapping as well as marine transportation. Because nearly all tide gauges are located in the coastal waters, previous studies mainly focus on tidal changes in the shallow waters. In the deep sea, due to the lack of long-term high-frequency sea level observations, tidal changes are remained unclear. Based on the tide gauge observations and satellite altimeter data, non-stationary tidal harmonic analysis toolbox S_TIDE to extract the long-term trend of amplitudes of four major constituents in the South China Sea is first used in this paper. Results show that in most areas of the South China Sea, the amplitudes of four major constituents are stable and have no significant positive or negative trends. In minor areas of the South China Sea, the amplitudes of four major constituents have significant trends. The largest positive trends can reach 2.91 mm/a and the largest negative trends can reach 3.50 mm/a. The long-term trends of tidal amplitudes in this area may be related to the change of the surface expression of internal tides. The tides observed by satellite contain not only barotropic tides but also the surface expression of internal tides. The internal tides as well as their surface expression in the South China Sea are strongest in the world. The changes of ocean stratification can influence the generation, propagation and dissipation of internal tides as well as their surface expression and eventually induce the long-term trends of tidal amplitudes in the South China Sea.
- South China Sea,
- the long-term trend of tides,
- satellite altimeter,
- S_TIDE,
- internal tides

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References(41)

References

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