High resolution stalagmite δ18O records over the past 1000 years from Dongge Cave in Guizhou
High resolution stalagmite δ18O records over the past 1000 years from Dongge Cave in Guizhou
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DOI：
10.1360/04wd0268
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发表时间：
2005-04
影响因子：
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通讯作者：
He Yaoqi;Yongjin Wang;X. Kong;Cheng Hai
中科院分区：
文献类型：
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作者：
He Yaoqi;Yongjin Wang;X. Kong;Cheng Hai
根据MC-ICP-MS铀系定年和稳定氧同位素分析结果，对贵州东阁洞两个石笋建立了4-5年分辨率的千年季风记录。高分辨率氧同位素记录可作为云贵高原亚洲西南季风降水变化的代用指标。树木年轮δ 18 O记录与Δ 14 C记录的密切关系，在很大程度上反映了百年尺度太阳活动对季风气候变化的影响。AD 1720年δ 18 O值的显著降低表明季风降水的突然增加，表明热带印度洋上空的大气-海洋耦合对北方半球气温在过去世纪的快速升高起着重要作用。
Based on MC-ICP-MS U-series dating and stable O-isotope analysis results, a 4–5 years resolution monsoon record over the past 1000 years has been established for two stalagmites from Dongge Cave, Guizhou. The high resolution oxygen isotope record serves as a proxy for variations in rainfall of Asian southwest monsoon over the Yunnan-Guizhou Plateau. A close relation of the δ18O record with the Δ14C record from tree rings largely reflects impact of centennial-scale solar activity on the monsoon climate changes. The conspicuous decrease in the δ18O value at AD 1720 indicates an abrupt increase in monsoon rainfall, suggesting that an atmospheric-oceanic couple over the tropical Indian Ocean plays an important role in rapid increase of the Northern Hemisphere temperature over the last century.