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中文摘要：
通过干式燃烧法对2008年8―9月南海北部的颗粒有机碳（POC）进行了分析,得出南海北部表层海水POC的含量范围为37～330μg/l。分析显示：受珠江口陆源输入颗粒物的影响,华南沿岸海域POC含量最高;浮游植物碳是中央海盆北部POC的重要组成;琼东上升流区和吕宋海峡则在一定程度上受陆源物质的影响。华南近岸浅海水域由于垂直混合,水体10 m以下水层POC分布比较一致。琼东上升流区、中央海盆北部及吕宋海峡100 m以浅水层POC总体表现为随深度增加而下降,琼东上升流区和吕宋海峡100～200 m水层POC含量出现波动,可能分别受到沉积物再悬浮和不同水团混合的影响。
英文摘要：
The particulate organic carbon（POC） in the surface seawater of northern South China Sea during August and September 2008 is investigated.The results show that the POC ranges from 37μg/l to 330μg/l.Horizontally,the highest POC occurs in the coastal waters of South China where receive terrestrial organic matter via the runoff of the Pearl River;the seawater POC in the northern Central Basin of the South China Sea is largely controlled by phytoplankton;and the POC in upwelling area off eastern Hainan Island and Luzon Strait is partly influenced by terrestrial organic matter.Vertically,the POC concentrations of the seawater below 10m along the coast of South China are generally consistent,and show a decreasing trend from surface down to 100 m in upwelling area off eastern Hainan,northern Central Basin of the South China Sea and the Luzon Strait.Due to the influences from sediment resuspension and water mass mixture,the POC concentrations in water depth between 100 and 200 m in eastern Hainan upwelling area and Luzon Strait are not stable.
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