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应用分子化石长链烯酮的不饱和度,在南海西部取得了45万年以来表层水温的变化记录,分辨率约1ka,是南海迄今为止时间最长的高分辨率温度剖面.结果表明U3k7′-SST与有孔虫氧同位素一样显示出冰期旋回的特征,冰期、间冰期表层水温的变化范围分别为23～25.5℃和25～28℃,最高温为MIS5.5时期的28.4℃,最低温为MIS2时期的22.6℃.5次冰期旋回转换期中温度变化都超前于有孔虫氧同位素,与南北半球温度变化记录对比显示南海的温度变化模式与南半球相似.频谱分析中强烈的岁差及半岁差周期显示了明显的热带区域特征.
Application of molecular fossil long-chain ketene unsaturation, in the western South China Sea has been made for 450,000 years since the surface water temperature records, resolution of about 1ka, is the longest so far in the South China Sea high-resolution temperature profile.The results show that U3k7 ’ The SST shows the characteristics of glacial cycles as well as the foraminifer oxygen isotopes. The surface water temperatures in glacial and interglacial periods range from 23 to 25.5 ℃ and 25 to 28 ℃, respectively. The maximum temperature is 28.4 ℃ in MIS 5.5, and the lowest temperature For the period of MIS2, the temperature changes during the transitional period of 22.6 ℃ .5 glacial cycles are all ahead of the foraminiferal oxygen isotopes. Compared with the records of temperature changes in the northern and southern hemispheres, the temperature variation pattern in the South China Sea is similar to that in the southern hemisphere. Periods show clear tropical zone features.