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130kaBP左右东亚季风突变过程的洞穴石笋记录 被引量:12

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摘要 基于湖北神农架地区石笋(SB25)6个230Th年龄和472个氧同位素分析,获得了133~127 ka时期十年际分辨率的δ18O时间序列.该石笋δ18O时间序列记录了倒二冰期向末次间冰期转换时东亚夏季风降水强度变化的详细过程.通过对石笋的精确定年,确定终止点Ⅱ的年龄为129.5±1.0 ka,证实了北半球太阳辐射是东亚季风冰期/间冰期转换的主要驱动力.该石笋δ18O值在冰期/间冰期旋回中振荡幅度达4‰左右,这在亚洲季风区洞穴记录中具有普遍性.分辨率为十年际的δ18O曲线显示东亚季风在倒二冰期向末次间冰期转换时表现为4个阶梯式阶段,其中'终止点Ⅱ停滞'后的季风降水突增与全球CH4浓度突变同步.
出处 《科学通报》 EI CAS CSCD 北大核心 2005年第23期2644-2648,共5页 Chinese Science Bulletin
基金 全国优秀博士学位论文作者专项资金(批准号:200227) 国家杰出青年科学基金(批准号:40225007)资助.
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