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地理科学  2015 

黔北洞穴石笋记录的末次冰消期至早全新世百年~十年际气候变化

, PP. 773-781

Keywords: 冰消期,前北方期,黔北,石笋,百年~十年际尺度

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Abstract:

通过黔北三星洞2支石笋(编号SX3-a和SX14)的25个高精度230Th年龄(测年误差≤76a)和740个氧同位素数据,重建了末次冰消期至早全新世(16.82±0.04~8.29±0.03kaB.P.)平均分辨率达10a的亚洲夏季风演变历史。无论在千年尺度还是百年尺度,甚至是十年际气候事件上,三星石笋δ18O记录的季风气候与北高纬气候都存在耦合关系。然而,在波令-阿勒罗德(B?lling-Aller?d)时期,与格陵兰冰芯所记录的温度逐渐回冷的趋势相反,亚洲夏季风表现出逐渐增强的过程。太阳辐射能量的增加和越赤道气流的增强有可能是引起此时期夏季风增强的主要原因。在前北方期(11.7~9kaB.P.)时,南极温度、大气CO2浓度和CH4浓度等在新仙女木(YoungerDryas,YD)结束后均达到最大值,而石笋δ18O记录表明在YD冷事件结束后,直到9kaB.P.左右亚洲夏季风才达到最盛期。冰消期结束后,虽然太阳辐射能量已经达到高值,但直到9kaB.P.之前,北美大陆仍然残留较大的冰盖,有可能对夏季风的增强起到一定的限制作用。另外,早全新世南极变冷同样有可能通过加强越赤道气流来影响夏季风气候。

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