贵州白骨洞石笋记录的全新世季风气候演化与突变

被引：16

作者：

吴江滢

汪永进

孔兴功

机构：

[1] 南京师范大学地理科学学院

来源：

海洋地质与第四纪地质 | 2006年 / 05期

关键词：

氧同位素; 季风降水; 全新世; 贵州石笋;

D O I：

10.16562/j.cnki.0256-1492.2006.05.007

中图分类号：

P532 [古气候学];

学科分类号：

摘要：

通过对贵州白骨洞BG1石笋13个230Th年龄的测试和390个氧同位素数据的分析,建立了12.8～3.3kaBP数十年尺度的亚洲季风降水序列,其长期演化趋势与北纬33°夏季日辐射能量曲线基本一致。石笋δ18O记录指示10.5～5.8 kaBP为本区气候湿润期,此后进入季风降水衰退期。在12.8～10.1 kaBP时段,平均分辨率为37 a的石笋降水记录与格陵兰冰心气温记录具有良好对应关系:(1)两者在新仙女木事件(YD)的变化细节及突变特征上表现出良好的一致性;(2)由YD事件向全新世转换的过程中两者都表现为3个阶梯式上升阶段,这种一致性有可能说明热带海气耦合驱动了北半球气候突变事件。在7.0～3.3 kaBP时段,平均分辨率为15 a的石笋δ18O序列记录了5次较为显著的降水减少期,可分别对应于冰心记录中的5个冷事件,高低纬气候的相似性可部分归因于太阳活动的影响。

引用

页码：55 / 60

页数：6

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