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基于贵州董哥洞两支石笋16个230Th年龄和486个δ18O测试数据,建立了过去1000a来洞穴石笋高分辨率δ18O的时间序列.该洞穴近1000a来δ18O变化曲线指示了云贵高原东南部西南季风降水变化过程.与太阳辐射曲线对比表明,百年尺度西南季风降水变化响应于太阳活动周期.洞穴石笋δ18O记录揭示了自1720AD年以来西南季风强度突增现象,反映了热带印度洋海-气耦合作用对过去一个世纪北半球温度上升起着重要作用.
Based on 16 230Th ages and 486 δ18O test data of two stalagmites in Dongge Cave, Guizhou Province, a time series of high resolution δ18O stalagmite in the past 1000 years was established. The δ18O curve of the cave over the past 1000 years indicates the southwesterly monsoon in the southeast Yunnan- The comparison with the solar radiation curve shows that the precipitation change of the southwest monsoon at the centennial scale is in response to the solar activity cycle.The δ18O record of the stalagmite of the cave reveals the sudden surge of the southwest monsoon intensity since 1720AD and reflects the coupling effect of the sea-atmosphere coupling in the tropical Indian Ocean The temperature rise over the past century has played an important role in the northern hemisphere.