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CENTENNIAL-SCALE EAST ASIAN MONSOON PRECIPITATION RECORD OVER 140~124 kaBP FROM A STALAGMITE IN SHENNONGJIA
Author(s): JIANG Xiu-yang, WANG Yong-jin, KONG Xing-gong, XIA Zhi-feng
Pages: 39-
44
Year: 2006
Issue:
3
Journal: MARINE GEOLOGY & QUATERNARY GEOLOGY
Keyword: 石笋; 百年尺度; 季风降水; 神农架;
Abstract: 基于神农架山宝洞SB28石笋230Th年龄和氧同位素数据,建立了140~124 kaBP百年尺度的东亚季风降水序列,其长期演化趋势与北纬33°夏季日辐射能量曲线基本一致.山宝洞SB28石笋与董哥洞D4石笋δ18O曲线呈现出整体一致的特征,证实了亚洲季风降水同位素组成变化具有广泛的区域意义.末次间冰期129.5~124.3kaBP季风降水具有百年尺度高频振荡特征,功率谱分析周期有525、228和207 a,类似于全新世大气△14C残差百年尺度周期,表明末次间冰期亚洲季风强度的变化仍然受太阳活动的影响.在倒数第二次冰期向末次间冰期转换时,北半球太阳辐射可能触发了全球末次间冰期全盛期的开始.
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