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根据1998年6~9月采集于南海海域沉积岩芯中的浮游有孔虫氧、碳同位素和SiO2、CaCO3地球化学地层序列,标定了南海的年代框架,并应用UK 37指标重建了南海南、北部末次盛冰期以来表层海水的古温度。结果显示:南海南部冰后期和末次盛冰期时UK 37海水表层估温分别为24.5~27.4℃和23.8~25.3℃,平均水温分别为26.3℃和24.3℃。南海北部冰后期和末次盛冰期时UK 37海水表层估温分别为23.3~26.9℃和22.2~23.8℃,平均水温分别为26.6℃和22.8℃。南海北部温差比南部大,也比同一纬度的其它观察点大得多,充分表明南海对气候变化响应的敏感程度远大于开放性大洋,同时也进一步证实了边缘海对于冰期旋回的环境信号具有放大效应。
Based on the sequences of the foraminifer foraminiferal, carbon isotope, SiO2 and CaCO3 geochronological stratigraphy collected from sedimentary cores in the South China Sea from June to September 1998, the annual framework of the South China Sea was calibrated and the South China Sea and the North Paleoclimatic temperature of surface seawater since last ice age. The results show that the surface temperature of the UK 37 sea surface is 24.5-27.4 ℃ and 23.8-25.3 ℃ respectively in the post-ice period and the last glacial ice stage in the southern South China Sea. The average water temperature is 26.3 ℃ and 24.3 ℃ respectively. The surface temperature of the UK 37 seawater in the northern and southern part of the South China Sea was estimated to be 23.3-26.9 ℃ and 22.2-23.8 ℃ respectively with average water temperatures of 26.6 ℃ and 22.8 ℃ respectively. The temperature difference in the northern part of South China Sea is larger than that in the south part and also much larger than other observation points at the same latitude, which fully shows that the South China Sea is more sensitive to climate change than open ocean, and further confirms that the marginal sea has magnified environmental signals for glacial cycles effect.