川东北宋家洞石笋氧碳同位素及锶含量突变分析

通过对宋家洞石笋SJ3的氧碳同位素及锶含量进行Mann-Kendall test突变分析,得出以下结论:(1)氧同位素值记录了末次冰盛期向Heinrich Event 1时期的转变;(2)碳同位素值和锶含量记录了由H1冷期向BФlling-AllerФd暖期的转变;(3)碳同位素值和锶含量指示了在19.8～15.3ka时当地的东亚夏季风和冬季风呈正相关关系,在15.3～14.8 ka呈负相关关系,表明石笋SJ3记录了古气候环境的冷干、暖湿变化,且不同气候指标对环境变化的敏感度不同。

Abrupt Change Analyses of Oxygen,Carbon Isotope Values and Sr Contents in a Stalagmite Retrieved from Songjia Cave,NE Sichuan

We analyze the abrupt changes of oxygen、carbon isotope values and Sr contents in stalagmite SJ3 retrieved from Songjia Cave,Central China.Some conclusions are given below:(1)Oxygen isotope values record the transition from Last Glacial Maximum to Heinrich Event One period;(2)Carbon isotope values record the transition from H1 cold period to BФlling-AllerФd warm period;(3)The correlation between Carbon isotope values and Sr contents indicate that the local East Asian summer monsoon were in-phase with the winter monsoon during 19.8~15.3ka while out of phase during 15.3~14.8ka.It's obvious that stalagmite SJ3 records the palaeoclimate changes between cold-dry and warm-wet conditions while different climate proxies were dissimilar in sensitivities with regard to climate changes.