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根据南海 9个深海柱状样中底栖有孔虫的稳定同位素记录 ,初步建立末次盛冰期以来的δ18O和δ13 C深度剖面 .结果表明末次盛冰期南海深部水的δ18O和δ13 C垂直梯度较全新世明显增大 ,并存在深约 2 0 0 0m的深温跃层和营养物跃层 ;特别是末次盛冰期相对全新世δ18O和δ13 C的变化分别减去冰川效应和全球平均变化值后 ,在水深 1 0 0 0～ 2 5 0 0m间出现正值 ,说明末次盛冰期南海这一深度范围内存在温度较冷或盐度偏咸、垂直流通好、富13 C的深层水团 ,与今明显不同 .进一步证实冰期存在“北大平洋深层水” ,但可能仅限于水深约 1 0 0 0～ 2 5 0 0m的范围内 .
Based on the stable isotopic records of benthic foraminifera from 9 deep sea samples in the South China Sea, the δ18O and δ13C depth profiles of the sediments from the last glacial maximum were established. The results show that the δ18O and δ13C vertical gradients of the deep water in the South China Sea during the last glacial - Obviously increased, and there was a deep thermocline and nutrient thermocline with a depth of about 2000m. Especially after the change of δ18O and δ13C in the Holocene relative to the last glacial maximum minus the glacier effect and the global average change, There was a positive value between 10 000 and 25 000 m in depth, indicating that there is cold water in the depth of the South China Sea during the last glacial period, salinity salty, vertical circulation, and 13 C-rich deep water mass It is further confirmed that there exists “deep water in the North Pacific Ocean” in the ice age, but it may be limited to water depths of about 100-250 m.