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Freshening of the Intermediate Waters in the Northern South China Sea over the Past Six Decades

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Journal of Tropical Meteorology 2024年第1期30卷 42-50页

作者：陈栩洋王东晓舒业强成里京范双双 School of Marine Sciences Sun Yat-Sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)ZhuhaiGuangdong 519082 China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301 China International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029 China

The properties of salinity in the South China Sea(SCS),a significant marginal sea connecting the Pacific and Indian Oceans,are greatly influenced by the transport of fresh water flux between the two oceans.However,the long-term changes in the intermediate water in the SCS have not been thoroughly studied due to limited data,particularly in relation to its thermodynamic variations.This study utilized reanalysis data products to identify a 60-year trend of freshening in the intermediate waters of the northern South China Sea(NSCS),accompanied by an expansion of low-salinity water.The study also constructed salinity budget terms,including advection and entrainment processes,and conducted an analysis of the salinity budget to understand the impacts of external and internal dynamic processes on the freshening trend of the intermediate water in the NSCS.The analysis revealed that the freshening in the northwest Pacific Ocean and the intensification of intrusion through the luzon strait at intermediate levels are the primary drivers of the salinity changes in the NSCS.Additionally,a weakened trend in the intensity of vertical entrainment also contributes to the freshening in the NSCS.This study offers new insights into the understanding of regional deep sea changes in response to variations in both thermodynamics and oceanic dynamic processes.

关键词： freshening South China Sea salinity of the intermediate water salinity budget analysis luzon strait transport

THE EFFECTS OF MONSOONS AND CONNECTIVITY OF SOUTH CHINA SEA ON THE SEASONAL VARIATIONS OF WATER EXCHANGE IN THE luzon strait

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Journal of Hydrodynamics 2009年第2期21卷 264-270页

作者： ZHAO Wei HOU Yi-jun QI Peng LE Ken-tang LI Ming-kui Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Graduate University of the Chinese Academy of Sciences Beijing 100039 China National Meteorological Center Beijing 100081 China

Seasonal variations of water exchange in the luzon strait are studied numerically using the improved Princeton Ocean Model （POM） with a consideration of the effects of connectivity of South China Sea （SCS） and monsoons. The numerical simulations are carried out with the strategy of variable grids, coarse grids for the Pacific basin and fine grids for the SCS. It is shown that the Mindoro strait plays an important role in adjusting the water balance between the Pacific and the SCS. The SCS monsoon in summer seasons hinders the entrance of the Pacific water into the SCS through the luzon strait while the SCS monsoon in winter seasons promotes the entrance of Pacific water into the SCS through the luzon strait. However, the SCS monsoon does not affect the annual mean luzon strait transport, as is mainly determined by the Pacific basin wind.

关键词： numerical experiment Kuroshio luzon strait transport seasonal variation

Seasonal variability of the isopycnal surface circulation in the South China Sea derived from a variable-grid global ocean circulation model

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Acta Oceanologica Sinica 2016年第1期35卷 11-20页

作者： WEI Zexun FANG Guohong XU Tengfei WANG Yonggang LIAN Zhan First Institute of Oceanography State Oceanic Administration Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology Key Lab of Marine Science and Numerical Modeling State Oceanic Administration

In this study, we develop a variable-grid global ocean general circulation model （OGCM） with a fine grid （1/6）° covering the area from 20°S-50°N and from 99°-150°E, and use the model to investigate the isopycnal surface circulation in the South China Sea （SCS）. The simulated results show four layer structures in vertical： the surface and subsurface circulation of the SCS are characterized by the monsoon driven circulation, with basin-scaled cyclonic gyre in winter and anti-cyclonic gyre in summer. The intermediate layer circulation is opposite to the upper layer, showing anti-cyclonic gyre in winter but cyclonic gyre in summer. The circulation in the deep layer is much weaker in spring and summer, with the maximum velocity speed below 0.6 cm/s. In fall and winter, the SCS deep layer circulation shows strong east boundary current along the west coast of Philippine with the velocity speed at 1.5 m/s, which flows southward in fall and northward in winter. The results have also revealed a fourlayer vertical structure of water exchange through the luzon strait. The dynamics of the intermediate and deep circulation are attributed to the monsoon driving and the luzon strait transport forcing.

关键词： South China Sea isopycnal surface circulation ocean general circulation model luzon strait transport

Covariation of the Indonesian Throughflow and South China Sea Throughflow Associated with the 1976/77 Regime Shift

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Advances in Atmospheric Sciences 2010年第1期27卷 87-94页

作者：刘钦燕王东晓周文谢强张燕 Key Laboratory of Tropical Marine Environmental Dynamics South China Sea Institute of OceanologyChinese Academy of Sciences Guy Carpenter Asia-Pacific Climate Impact Centre CityU-IAP Laboratory for Atmospheric SciencesCity University of Hong Kong South China Sea Marine Engineering Prospecting State Oceanic Administration

Changes in the Indonesian Throughflow （ITF） and the South China Sea throughflow-measured by the luzon strait transport （LST）-associated with the 1976/77 regime shift are analyzed using the Island Rule theory and the Simple Ocean Data Assimilation dataset. Results show that LST increased but ITF transport decreased after 1975. Such changes were induced by variations in wind stress associated with the regime shift. The strengthening of the easterly wind anomaly east of the luzon strait played an important role in the increase of LST after 1975, while the westerly wind anomaly in the equatorial Pacific contributed significantly to the decrease in ITF transport after 1975; accounting for 53% of the change. After 1975, the Kuroshio Current strengthened and the Mindanao Current weakened in response to a decrease in the total transport of the North Equatorial Current. Both the North Equatorial Countercurrent and the South Equatorial Current weakened after 1975, and an anomalous cyclonic circulation in the western equatorial Pacific prevented the tropical Pacific water from entering the Indian Ocean directly.

关键词： Indonesian throughflow luzon strait transport regime shift wind anomaly