吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (1): 170-184.doi: 10.13278/j.cnki.jjuese.20180337
• 地质与资源 • 上一篇
杜玉1,2,3, 张新荣1,2,3, 平帅飞1,2,3, 焦洁钰1,2,3, 马春梅4
Du Yu1,2,3, Zhang Xinrong1,2,3, Ping Shuaifei1,2,3, Jiao Jieyu1,2,3, Ma Chunmei4
摘要: 对敦化北部山地205 cm深泥炭剖面中的植硅体进行提取、鉴定和分析,结合AMS14C测年,重建研究区近2 ka的古气候环境过程,探讨其变化规律及影响因素。植硅体组合、有序聚类和植硅体指数变化趋势显示,研究区泥炭沼泽经历了4个显著阶段:即45-680 A.D.暖湿阶段;680-1340 A.D.温暖偏干阶段;1340-1870 A.D.由干转湿的寒冷阶段;1870-2017 A.D.转暖、干湿波动阶段。其中,680-1225 A.D.对应中世纪暖期(MWP),1340-1870 A.D.对应小冰期(LIA)。在此气候变化背景下,泥炭沼泽发展经历了由缓慢逐渐加快的过程。对比太阳辐射和太阳活动的变化、石笋δ18O序列、重建的东北地区古温度以及Niño3.4重建曲线,泥炭剖面的植硅体分析显示MWP和LIA期间的古气候过程受到太阳活动、太阳辐射、季风环流和ENSO(El Niño-Southern Oscillation)的控制。
中图分类号:
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