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科学通报  2012 

全新世黔北降水特征的石笋记录及适宜期结束时间在亚洲季风区的不等时性

DOI: 10.1360/csb2012-57-1-73, PP. 73-79

Keywords: 全新世适宜期,印度季风,东亚季风,不等时性,石膏洞,石笋氧同位素

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Abstract:

基于黔北石膏洞两支石笋(SG1和SG2)的12个高精度230Th年龄(误差为±2.5~55a)和479个氧同位素数据,建立了全新世9.9kaBP(相对1950AD)至今较高分辨率的东亚季风和印度季风交汇区季风降水序列.石膏洞δ18O记录表明9.9~6.6kaBP,季风降水处于降水丰沛的湿润期;6.6~1.6kaBP,该时段为降水逐渐减弱时期;1.6kaBP至今石笋δ18O最为偏正,季风降水整体处于较弱期,其长期演变趋势整体追随30°N夏季太阳辐射能量变化曲线.利用时序分析方法,对石膏洞与已发表的高分辨率石笋δ18O记录分析发现,石笋所揭示的全新世适宜期结束时间在不同季风区存在显著差异统计分析结果显示印度季风区的阿曼为7.2~7.4kaBP,东亚季风下的华中地区为5.6~5.8kaBP,而地处于两季风交汇处的西南一带则介于其中约为6.6~7.0kaBP.我们认为供应东亚季风水汽来源的热带西太平洋海水表面温度变化,是可能造成亚洲不同地区全新世适宜期结束时间不一致的原因.

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