南黄海东西两侧陆架冰消期以来稳定同位素记录的比较研究

THE COMPARATIVE STUDY ON STABLE ISOTOPIC RECORDS SINCE DEGLACIATION IN EAST AND WEST PARTS OF THE SOUTH YELLOW SEA

黄海东西两侧共享冰消期以来的海侵进程，构成了东、西可比较研究的基础；同时，黄海陆架东西两侧的不对称造成的古海洋动力环境分异以及受相邻陆地径流的差异影响，又使得黄海东、西部的同位素记录各自具有区域特征。西侧陆架水体受陆地径流的控制，同位素记录的波动代表水体中海水与陆地径流水的混合比例；东侧陆架主要受环流水交换及底层水切入的影响，其氧同位素组成更趋近于反映陆架边缘海的环境特征。

The east and west parts of the South Yellow Sea share the marine transgressive process that occurred since deglaciation,which becomes the basis for comparative study on stable isotopic records in these both sides.Because of the asymmetry of the continental shelf and the resulting difference in hydrodynamic environment,the statistic characteristics of δ 13 C and δ 18 O such as values and distributions are different from each other.According to the data of core QC 2,we found that the value of δ 18 O in the west part of the South Yellow Sea is far less than that of deep sea,which indicates that more fresh water from the adjacent land area affects the variation of value of δ 18 O.From the data of cores YSDP102 and 103,we can see that the changes between δ 13 C and δ 18 O is asynchronous,which indicates that strong exchanges among different water bodies control the variations of stable isotopic compositions in the east part of the South Yellow Sea.