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cross-shelf variation of internal tides west of the Dongsha Plateau in the northern South China Sea

Acta Oceanologica Sinica 2023年第10期42卷 23-35页

作者： Wei Yang Ruixiang Li Yanqing Feng Huijie Xue State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China South China Sea Marine Survey Center Ministry of Natural ResourcesGuangzhou 510300China Key Laboratory of Marine Environment Survey Technology and Application Ministry of Natural ResourcesGuangzhou 510300China State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China

We examine the cross-shelf variation of internal tides(ITs)west of the Dongsha Plateau in the northern South China Sea based on observations from 4 moorings deployed between August 2017 and September *** the slope,the amplitude of diurnal baroclinic current ellipses are 5 times larger than that of barotropic *** baroclinic energy quickly dissipates during cross-shelf propagation,and barotropic currents become dominant on the shelf outside of the Zhujiang River Estuary,with the amplitude of semidiurnal barotropic current ellipses being 10 times larger than that of the baroclinic *** modal decomposition indicates the first baroclinic mode is dominant for both diurnal and semidiurnal *** total horizontal kinetic energy(HKE)of the first three baroclinic modes shows spatiotemporal differences among the 4 *** the slope,the HKE for diurnal ITs is stronger in summer and winter,but weaker in spring and autumn;for semidiurnal ITs there is a similar seasonal variation,but the HKE in winter is even stronger than that in *** the shallow shelf,both diurnal and semidiurnal ITs maintain a certain intensity in summer but almost disappear in *** analysis shows that only the upper water column is affected by seasonal variation of stratification on the slope,variation of diurnal ITs is thus controlled by the semi-annual cycle of barotropic energy input from the Luzon Strait,while the incoherent baroclinic currents make a major contribution to the temporal variation of semidiurnal *** the shelf region,the water column is well mixed in winter,and the baroclinic energy largely dissipates when ITs propagate to the shelf zone despite of a strong barotropic energy input from the Luzon Strait.

关键词： internal tide Dongsha Plateau cross-shelf variation dynamic modal decomposition coherent

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