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中更新世气候转型期南海北部和南部的气候变化差异

, PP. 381-390

Keywords: 中更新世气候转型,南海,东亚季风,稳定同位素

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Abstract:

选取大洋钻探ODP184航次在南海北部采集的1144站为研究材料,通过分析中更新世0.4~1.4Ma期间506个样品中浮游有孔虫氧、碳稳定同位素的变化特征,并与南海南部ODP1143站和西太平洋暖池ODP807站的同位素资料进行比较,发现南海北部的氧、碳稳定同位素及其差值的变化响应中更新世气候转型事件,在中更新世距今约0.9Ma之后100ka的偏心率周期明显增强。在中更新世气候转型之前,南海北部、南海南部和赤道西太平洋都呈现出典型的热带气候特征,具有岁差和半岁差的气候周期;转型之后,随着北半球冰盖的进一步扩张,南海北部受东亚冬季风增强的影响而导致温度下降、温跃层变深,但南海南部与赤道西太平洋的温度变化较小且温跃层变浅,说明同属季风区的南海北部和南部对气候变化的响应有所不同。

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