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地质论评  2011 

MIS8―MIS9阶段亚洲季风的轨道尺度气候变率:栾川老母洞石笋记录

Keywords: 石笋,亚洲季风,倒三冰期,老母洞,河南栾川

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Abstract:

通过对河南西部栾川县老母洞LM-1石笋U/Th年龄和205个氧同位素的分析,初步建立起黄土高原东南缘豫西地区倒数第三次冰期(氧同位素MIS8―MIS9阶段)千年尺度的亚洲季风演化特征。LM-1石笋?δ18?O记录最轻为?-11.38‰,最重为?-6.99‰,振幅达4.37‰,平均值为-9.07‰,说明LM1石笋敏感地记录了该时期的亚洲季风气候变化历史。LM1石笋?δ18记录与湖北神农架林竹洞LZ15石笋记录十分类似,同时两者记录的岁差旋回与同时期北纬65°N夏季太阳辐射变化曲线有一定相关性,表明河南和湖北两地在长时间尺度上都受相同的气候系统控制,并且太阳辐射是该时段气候变化的主要驱动因素。LM-1石笋记录的MIS8―MIS9转换阶段?δ18O变化与南极Vostok冰芯CO2浓度减少的趋势一致,由此推断CO2、CH4及N2O等大气气体含量的变化可能放大了轨道驱动的亚洲季风的气候波动。

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