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Circulation in the South China Sea is in a state of forced oscillation:Results from a simple reduced gravity model with a closed boundary

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Acta Oceanologica Sinica 2022年第7期41卷 1-12页

作者： Rui Xin Huang Hui Zhou Woods Hole Oceanographic Institution Woods HoleFalmouthMassachusetts02543USA Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao266071China Laboratory for Ocean Dynamics and Climate Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao266237China University of Chinese Academy of Sciences Beijing100049China

The South China Sea(SCS)is a narrow semi-enclosed basin,ranging from 4°–6°N to 21°–22°N *** is forced by a strong annual cycle of monsoon-related wind *** Coriolis parameter f increases at least three times from the southern basin to the northern *** a result,the basin-cross time for the first baroclinic Rossby wave in the southern part of the basin is about 10-times faster than that in the northern part,which plays the most vitally important role in setting the *** the northernmost edge of SCS,the first baroclinic Rossby wave takes slightly less than 1 year to move across the basin,however,it takes only 1–2 months in the southernmost ***,circulation properties for a station in the model ocean are not solely determined by the forcing at that time instance only;instead,they depend on the information over the past *** combination of a strong annual cycle of wind forcing and large difference of basin-cross time for the first baroclinic Rossby wave leads to a strong seasonal cycle of the circulation in the SCS,hence,the circulation is dominated by the forced oscillations,rather than the quasi-steady state discussed in many *** circulation in the SCS is explored in detail by using a simple reduced gravity model forced by seasonally varying zonal wind *** particular,for a given time snap the western boundary current in the SCS cannot play the role of balancing mass transport across each latitude nor balancing mechanical energy and vorticity in the whole *** a departure from the steady wind-driven circulation discussed in many existing textbooks,the circulation in the SCS is characterized by the imbalance of mechanical energy and vorticity for the whole basin at any part of the seasonal *** particular,the western boundary current in the SCS cannot balance the mass,mechanical energy,and vorticity in the seasonal cycle of the ***,the circulation near the western boundary cannot be i

关键词： South China Sea ocean circulation annual cycle first baroclinic Rossby wave propagation western boundary current forced ossilation

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