Tidal currents in the coastal waters east of Hainan Island in winter

Min LI; Lingling XIE; Xiaolong ZONG; Junyi LI; Mingming LI; Tong YAN; Ronglei HAN

doi:10.1007/s00343-021-0453-y

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Tidal currents in the coastal waters east of Hainan Island in winter

Physics | Updated：2023-05-20

- Tidal currents in the coastal waters east of Hainan Island in winter
- Journal of Oceanology and Limnology Vol. 40, Issue 2, Pages: 438-455(2022)
- Affiliations：
  
  1.Laboratory for Coastal Ocean Variation and Disaster Prediction, Guangdong Ocean University, Zhanjiang 524088, China
  2.Key Laboratory of Climate, Resources and Environment in Continental Shelf Sea and Deep Sea of Department of Education of Guangdong Province, Guangdong Ocean University, Zhanjiang 524088, China
  3.Marine Resources Big Data Center of South China Sea, Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524013, China
  4.Institute of Marine Sciences, Shantou University, Shantou 515063, China
  5.South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
  6.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou 511458, China
  7.Key Laboratory of Space Laser Communication and Detection Technology, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
- Author bio：
  
  Lingling XIE, E-mail: xiell@gdou.edu.cn
- Funds：
- DOI：10.1007/s00343-021-0453-y
  CLC：
- Received：24 November 2020，
  
  Accepted：31 January 2021，
  
  Online First：01 April 2022，
  
  Published：2022-03
- Accepted：
Scan QR Code
Min LI, Lingling XIE, Xiaolong ZONG, et al. Tidal currents in the coastal waters east of Hainan Island in winter[J]. Journal of Oceanology and Limnology, 2022, 40(2): 438-455.
DOI：

Min LI, Lingling XIE, Xiaolong ZONG, et al. Tidal currents in the coastal waters east of Hainan Island in winter[J]. Journal of Oceanology and Limnology, 2022, 40(2): 438-455. DOI： 10.1007/s00343-021-0453-y.

摘要

Abstract

Using the 25-h continuing hydrographic observations at three successive stations in February 2012 and the mooring time series of current observations from January to March 2015

the tidal currents and tidal energy fluxes in the coastal waters east of Hainan Island in the northwestern South China Sea were analyzed. The diurnal and semidiurnal (using K1 and M2 as proxies

respectively) tidal currents and associated isopycnal undulations were derived with harmonic analysis. Results show that the velocities of the diurnal and semidiurnal tides derived from the 25-h observations are comparable to those from the mooring series. The semi-major axes of the tidal ellipses were

(4–7 cm/s) for barotropic tides and

(2–4 cm/s) for baroclinic tides. The directions were in NE–SW at deeper stations to N–S at the shallowest station for the diurnal tide and from NW–SE to NE–SW for the semidiurnal tide. Both the diurnal and semidiurnal isopycnal fluctuations reached

(5 m)

(8 m)

and

(10 m) at the cross-shelf stations (H03

H04

and H05) from 35 m

45 m

to 55 m

respectively

showing insignificant vertical variation

and the barotropic signals were predominate. The baroclinic diurnal tide showed first-mode structures at H03-05

as does the semidiurnal tide at H03. The semidiurnal tide at H04 and H05 exhibited higher-mode structures. The time series of both the alongshore and cross-shore components reveal the vertically propagation features of the baroclinic tidal phase and energy. The calculated horizontal energy fluxes of the diurnal and semidiurnal internal tides decreased from

(0.1 W/m) at H05 to

(0.01 W/m) at H03

implying a propagation and dissipation of energy from offshore to inshore.

关键词

Keywords

references

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