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地理科学  2007 

南京年纹层石笋δ18O记录的冰期气候事件特征

, PP. 75-80

Keywords: 南京石笋,东亚季风,冰期事件

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Abstract:

根据南京葫芦洞一支石笋高精度230Th年龄及纹层计数建立24~21kaB.P.时段平均分辨率3年的δ18O季风降水序列,精确标定了IS2事件的发生时间。通过与极地冰芯记录对比,发现GISP2与石笋时标一致,而GRIP和NGRIP时标在相当事件上偏年轻800~2000年。结合洞内另一支不同时段的石笋年纹层记录,证实东亚季风降水与极地气候在反映气候事件特征上有所不同,季风气候在由干向湿的转型期(包括H2、H1)呈现阶梯式增长特征,其持续时间均超过600年,有可能说明除北大西洋温盐环流外,低纬太平洋海-气耦合也是东亚季风气候的重要触发源。

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