【摘要】 通过对葫芦洞、三宝洞和董哥洞末次盛冰期(～30 000 aBP)以来的石笋氧同位素数据序列进行连续小波变换。其结果显示在中国南方区域冰期的气候波动较全新世剧烈,盛冰期的气候波动较冰消期剧烈。在全新世阶段,董哥洞和三宝洞石笋氧同位素的周期均具有显著的三阶段特征。但在千百年尺度上,两地气候周期的长度和强度并不尽相同,董哥洞石笋氧同位素的周期信号相对较弱。其原因是董哥洞区域受西南季风和东亚季风的共同影响,二者之间的反相位关系削弱和改变了气候变化的千年周期。这一特征反映了不同季风区域、不同周期的气候变化主导因素可能有所差异。分析结果同时显示,在～3 000 aBP,东亚区域气候模式可能发生了重大转折。更多还原

【Abstract】 The continuous wavelet transform was introduced to assay the oxygen isotope sequences of stalagmites since the Last Glacial Maximum(~30 000 aBP) at Hulu Cave,Sanbao Cave,and Dongge Cave in South China.The result shows that the climate fluctuation in glacial period was more prominent than that in interglacial period.The periods of oxygen isotope in both Dongge Cave and Sanbao Cave were characterized by three stages during the Holocene.However,the length,as well as the intensity of oxygen isotope periods displayed significant difference between two caves.The reason is that the climate in Sanbao Cave region was only controlled by the East Asian Summer Monsoon(EASM),while that in Dongge Cave region was jointly influenced by the Indian Summer Monsoon(ISM) and EASM.The weak periods in Dongge Cave may be correlated to the strong anti-phasing of the ISM and EASM.The climate transformation from stability to fluctuation at ~3 000 aBP was also presented by the analysis result.更多还原