Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow

Guijun LIU; Yu WANG

doi:10.1007/s00343-025-4352-5

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Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow

Physics | Updated：2026-05-07

- Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow
- Journal of Oceanology and Limnology Vol. 44, Issue 2, Pages: 560-569(2026)
- Affiliations：
  
  1.Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Physical Oceanography, Ocean University of China, Qingdao 266100, China
  2.College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
  3.National Marine Environmental Monitoring Center, Dalian 116023, China
- Author bio：
  
  yuwang@nmemc.org.cn
- Funds：
- DOI：10.1007/s00343-025-4352-5
  CLC：
- Received：23 December 2024，
  
  Accepted：11 April 2025，
  
  Online First：06 June 2025，
  
  Published：01 March 2026
- Accepted：
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LIU Guijun,WANG Yu.Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow[J].Journal of Oceanology and Limnology,2026,44(02):560-569.
DOI：

LIU Guijun,WANG Yu.Seasonal cycles of the ocean bottom pressure in the South China Sea and the Luzon Strait deepwater overflow[J].Journal of Oceanology and Limnology,2026,44(02):560-569. DOI： 10.1007/s00343-025-4352-5.

摘要

Abstract

Driven by the persistent baroclinic pressure difference

the Luzon Strait deepwater overflow (LSDO) from the Pacific into the South China Sea (SCS) plays an influential role in the dynamical processes in the deep SCS. Based on the ocean bottom pressure (OBP) data

seasonal cycles of the OBP anomalies in the SCS and the LSDO are presented. On the seasonal scale

for shelf areas shallower than 200 m

the OBP anomalies are regulated by the wind stress curls: negative curls in winter lead to the Ekman convergences and the ensuing positive OBP anomalies and vice versa for positive curls in summer

while for the deep basin deeper than 2 000 m

the OBP anomalies show spatial consistency in sign: negative in winter and spring as well as positive in summer and autumn. The seasonal cycle of the LSDO is revealed and found to be mainly due to baroclinic processes east of the Luzon Strait. Along 21.25°N

significant seasonal signals extend downward and westward

reaching about 2 500-m depth at 124°E

and phase isolines are parallel to this extending. These facts suggest that the seasonal variability of the LSDO might originate from the upper ocean and meridional mode Rossby waves could be a possible dynamical mechanism.

关键词

Keywords

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