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《Chinese Journal of Atmospheric Sciences》 2003-03
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Annual and Semi-Annual Cycles of the Upper Thermal Structure in the South China Sea

Gao Rongzhen 1,2),Wang Dongxiao 1), Wang Weiqiang 1,2),Zhou Faxiu 2),and Xie Qiang 1) 1) (Laboratory for Tropical Marine Environmental Dynamics, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301) 2) (College of Oceanic Environment, Ocean University of China, Qingdao 266003)  
Based on three ATLAS Mooring buoy data provided by the SCSMEX project (South China Sea Monsoon Experiment), harmonic analysis method was applied to determine amplitudes and phases for the annual and semi-annual cycles of temperatures in the upper layer (1~250 m) in the South China Sea (SCS). At the stations of SCS1 (18°05′54″N, 115°35′48″E) and SCS3 (12°58′30″N, 114°24′30″E), temperature variances of annual and semi-annual cycle in the surface layer (surface to 50 m) are out-of-phase with those in the sub-surface layer (50 m through 250 m). However, corresponding temperature variations at the stations of SCS2 (15°20′36″N, 114°57′18″E) are vertiaclly in phase. Further studies suggest that temperature variations at SCS2 are controlled by the advection term, while temperature variations at the other two sites are dominated by the convection term induced by Ekman pumping. As far as the annual cycle concerned, maximum amplitude appears in the sub-surface at SCS2 and SCS3, but in the surface at SCS1. The maximum amplitude for the semi-annual cycle appears in the sub-surface similarly at the three sites. Nevertheless, the amplitudes for tha annual cycle at SCS1 and SCS3 decrease with depth beneath the mixed layer, which results in contribution of the semi-annual cycle compareable that of annual cycle, especially at SCS3.
【Fund】: 国家重点基础研究发展规划项目G1 9990 4 380 6;; 国家八六三计划 2 0 0 2AA6392 5 0;; 国家自然科学基金资助项目 4 0 1 0 60 0 2共同资助
【CateGory Index】: P732
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【Co-citations】
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