气候地层中0.9Ma以来同位素亚段的再划分

同位素段、亚段乃至次亚段的划分实质上是定义不同级别 (层次 )的气候事件 ,为全球不同级别气候事件的对比提供参照。但已有的研究可能受区域性因素及记录本身条件所限 ,对同位素亚段、次亚段划分的数目及对比不尽一致。基于太阳辐射曲线、柴达木盆地高分辨率自然伽玛 (GR)曲线及其他相关气候记录的对比研究发现 ,同位素亚段的划分与太阳辐射曲线岁差周期间存在着明确的对应关系 ,据此对 0 .9Ma以来同位素亚段划分进行补充和校正。基于气候层次的观点 ,建议以太阳辐射曲线为参照 ,对同位素亚段重新进行系统命名 ,在轨道尺度变化这一级取消次亚段 ,即完全按照太阳辐射曲线峰值进行亚段编号。

RESTUDY ON ISOTOPE SUBSTAGE DURING THE LAST 0.9Ma IN CLIMATE STRATIGRAPHY

The isotope stages and substages indicate climate events of different scales, which provides the framework for the correlation of global climate events. But because of the limitation of records themselves, there still have been some disputes about the definition of substage events. Through correlation of 65°N insolation curve, GR curve and other related records, the isotope events during the past 0.9Ma are implemented and revised. Based on the climatic hierarchy theory, Hypo-substage should be cancelled in the orbital time scale level, viz. substage should be numbered according to insolation curve peaks.