OALib Journal期刊
ISSN: 2333-9721
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云南小中甸盆地湖相沉积记录的最近5次Heinrich事件
DOI: 10.11821/xb201101012, PP. 123-130
Keywords: 小中甸,西南季风,Heinrich事件
Abstract:
通过对小中甸盆地厚15.3m的湖相沉积进行系统的粒度、孢粉和地球化学元素分析,结合14C年代测定,发现小中甸盆地在最近40ka以来经历了5次湖泊收缩事件,其形成年代可以同北大西洋的Heinrich事件H0-H4逐一对比,指示西南季风不仅在其水汽源区,而且在其控制的内陆腹地对最近40ka以来的Heinrich事件都存在敏感的响应。与在水汽源区所表现不同的是,Heinrich事件在内陆地区主要表现为干旱。通过与西南季风水汽源地之一的阿拉伯海深海沉积记录和格陵兰冰芯记录进一步对比发现,小中甸盆地仅对千年尺度的Heinrich冷事件信号敏感而对D/O(Dansgaard-Oescher)暖事件缺乏明显记录,这与阿拉伯海的响应模式有较大差异。分析周边环流形势认为,冰期青藏高原对西南季风“抽吸”作用的减弱是造成小中甸盆地D/O暖信号记录不明显的重要原因。
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