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南海东北部海区1994年夏季海水氧同位素示踪物分析结果表明：氧同位素δ18O值的分布在一定程度上反映了本区环流的某些特征。δ18O值在垂向上表现出表层低正值，次表层达到最大值，然后随深度的增加逐渐降低的特点。δ18O值的断面分布与平面分布为东沙群岛附近流环的存在提供了同位素示踪物证据。此外，对δ18O值与盐度、温度的相互关系进行了初步讨论。
The analysis of the seawater oxygen isotope tracer in the summer of 1994 in the northeastern South China Sea shows that the δ18O distribution of oxygen isotope reflects some characteristics of circulation in this area to a certain extent. The δ18O value shows a low positive value in the vertical direction, a maximum value in the subsurface, and then gradually decreases as the depth increases. The cross-section and plane distribution of δ18O values provide evidence of isotope tracers for the presence of flow rings around the Dongsha Islands. In addition, the relationship between δ18O value and salinity and temperature was discussed.