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《Oceanologia et Limnologia Sinica》 2016-01
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OBSERVED INTER-ANNUAL VARIABILITY OF VOLUME TRANSPORT AT 120°E TRANSECT IN NORTHEASTERN SOUTH CHINA SEA

HOU Hua-Qian;XIE Qiang;CHEN Geng-Xin;HE Yun-Kai;SHU Ye-Qiang;TILAK Priyadarshana;YAO Jing-Long;WANG Dong-Xiao;State Key Laboratory of Tropical Oceanology, South China Sea Institute of Oceanology, Chinese Academy of Sciences;University of Chinese Academy of Sciences;Institute of Deep-Sea Science and Engineering,Chinese Academy of Sciences;Faculty of Fisheries and Marine Sciences & Technology University of Ruhuna;  
Using hydrographic data with geostrophic calculation and normal mode analysis along the 120°E transect in September from 2005 to 2009, 2011, and 2013, we revealed the vertical characteristics and interannual variation of the velocity fields in the northeastern South China Sea(SCS). Results show that, the direction of velocity fields in 2005, 2006, 2007, and 2013 changed with depth and presented a baroclinic structure, and were dominated by barotropic and the first baroclinic modes as revealed in normal mode analysis. Differently, the velocity fields were uniform in vertical structures in 2008, 2009, and 2011, which was resulted mainly from the barotropic mode contributions. The volume transport along the section in depth can be classified into three types: westward transport in all depths(i.e., 2005, 2007, and 2011), westward transport in the upper layer and eastward transport in deeper layers(2008 and 2013), and eastward transport in upper layer and westward in lower layer(2006 and 2009). The net volume transport presented an obvious interannual variability. The maximal westward transport was –11.2Sv in 2005, whereas the maximal eastward transport was 9.1Sv in 2013. The minimal transport occurs in 2009 for only –1.2Sv. In addition, the quasi barotropic volume transport is dominated by the barotropic mode and the first baroclinic mode, in which the barotropic mode is bigger than the the first baroclinic mode. For the baroclinic volume transport, the barotropic mode and the first two baroclinic modes are the leading modes.
【Fund】: 国家自然科学基金项目 41276024号 41476011号 91228202号;; 三亚深海科学与工程研究所知识创新工程领域前沿项目 SIDSSE-201205号;; 中国科学院战略性先导科技专项(B类)项目 XDB06020101号
【CateGory Index】: P731.2
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