1994年夏季南海东北部海水氧同位素分布特征

DISTRIBUTIVE CHARACTERISTICS OF O ISOTOPE OF THE NORTHEASTERN SOUTH CHINA SEA IN THE SUMMER OF 1994

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。

Research on the northeast part of South Chna Sea in which we analysed the results of O isotopic tracer showed that: to some extent the O isotope distribution reflects the features of the circulation in the studed area; in vertical direction δ18O value is close to zero in the surface layer and aPproaches maalmum in the subsurface layer, then decreases with depth; the sectional and horizontal distribution of δ18O values provide the isotopic tracer evidence for the ring near the Dongsha IslandsBesides, the correlations among the b'8O value and salinity and temperature are prelindnarily discussed.