| 摘要: |
| 为了弄清北太平洋水入侵南海的状况,利用历史观测温-盐数据等资料对其进行了分析。结果表明:在盐度极大值层北太平洋水通过吕宋海峡的入侵整年发生,并且其入侵有很大的季节变化,冬季东北季风盛行时最强。北太平洋热带水(NPTW)入侵的季节变化与次表层地转流和南海的经向翻转环流结构有密切联系。具有盐度极小值特性的北太平洋中层水(NPIW)也通过吕宋海峡入侵南海,但其季节变化与NPTW完全反位相。冬季,由于在中层水深度北向运动的南海经向翻转环流的阻碍作用,NPIW入侵南海最弱。作者认为,北太平洋水入侵南海的机制可以基本上从南海的地转流及经向翻转环流得到解释。 |
| 关键词: 南海水团，地转流， 经向翻转 |
| DOI：10.11693/hyhz200801009009 |
| 分类号: |
| 基金项目:国家自然科学基金项目“南海上层海洋垂向层化结构及其与表面强迫的关系”，40406006号;国家自然科学基金项目“南海北部季节性上升流的变化特征研究”，4057601 3号;中国科学院资源环境领域知识创新工程重要方向项目“南海北部海洋生态动力学特征研究”，KZCX3-SW-227号 |
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| SEASONAL VARIATION OF SUBSURFACE AND INTERMEDIATE WATER MASSES IN THE SOUTH CHINA SEA |
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LIU Chang-Jian1,2, DU Yan1,3, ZHANG Qing-Rong1, WANG Dong-Xiao1
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1.Key Laboratory of Tropical Marine Environment Dynamics,South China Sea Institute of Oceanology,Chinese Academy of Sciences;2.South China Sea Marine Engineering Surveying Center,State Oceanic Administration;3.International Pacific Research Center, SOEST, University of Hawaii
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| Abstract: |
| The intrusion of North Pacific Water into the South China Sea (SCS) through the Luzon Strait has a great impact on the SCS circulation wand water renewal. Historical in-situ data of temperature and salinity were used to analyze the intrusion. Results demonstrate that the intrusion happens all year-round through the Luzon Strait in the salinity maximum layer and varis in season significantly, with the maximum in winter when northeastern monsoon prevails. The seasonal variation of the North Pacific Tropical Water (NPTW) has a close relationship with geostrophic current in the subsurface and with the structure of the SCS through the Luzon Strait, but its seasonal variation is completely out of phase with that of the NPTW. The intrusion of the NPIW into the SCS is the weakest in winter due to northward movement of the SCS Meridional Overturning in intermediate depth. The intrusion mechanism of North Pacific Water into the SCS can be interpreted mostly by the movement of the geostrophic current and Meridional Overturning in the SCS. |
| Key words: SCS Water Mass, Geostrophic current, Meridional overturning |
