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<p>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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年8月26日

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  • Guijun Liu,
  • Yu Wang

摘要

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.