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调查海区位于南海海盆中部和西沙—中沙群岛周围海域。南海地处热带季风区:冬夏分别为东北和西南季风期。南海中氧含量各层平面分布及其变化趋势是:表层冬春呈北高南低:夏秋呈均匀分布,从表层至深层(1000m)高氧层随深度增加向西北方向位移;夏秋呈北高南低。氧含量在垂直方向上具有相同的变化模式(特别是200m以深):表层氧含量较高,最大值除冬季出现在表层外,一般都在30～75m~(?)层(此层叶绿素a数量最多)。在200m层附近出现氧逆转现象。700m处出现氧最小值。深层海水具有大洋水的性质。
The investigation sea area is located in the middle of the South China Sea Basin and the sea area around the Xisha - Zhongsha Islands. The South China Sea is located in the tropical monsoon region: winter and summer respectively, the northeast and southwest monsoon period. The distribution of the oxygen content in the South China Sea and its changing trend are: North and South low in winter and spring in surface: evenly distributed in summer and autumn, the northwestern direction of the deep layer (1000m) South low. The oxygen content in the vertical direction with the same pattern of changes (especially 200m deep): the surface oxygen content is higher, the maximum in winter appears in the surface layer, usually in the 30 ~ 75m ~ (?) Layer (this layer of chlorophyll a number most). Oxygen reversal occurs near 200 m. 700m at oxygen minimum. Deep sea water has the nature of ocean water.