晚更新世60～90kaBP气候变化探讨

Discussion on the Climatic Change of the 60-90kaBP in Late Pleistocene Epoch

60～90 kaBP是末次间冰期向末次冰期转换时期,此时段经历了许多重要的气候事件。对此进行深入研究有助于了解这些气候突变事件,为理解气候驱动机制提供新的视角。通过系统回顾60～90 kaBP洞穴石笋、极地冰芯等古气候载体的研究成果,探讨72 kaBP气候突变事件与Toba火山喷发的关系,提出72 kaBP的Toba火山喷发并不是导致72 kaBP气候事件的主导因素;MIS4/5a的转换时间不能以72kaBP气候事件为界,应以Dansgaard/Oeschger（D/O）20事件为界;石笋记录在晚更新世变化趋势与太阳辐射曲线基本一致,但D/O18事件在不同地区、不同古气候载体中存在差异性,说明全球气候在长时间尺度下受太阳辐射影响,而在短时间尺度上受控于多种因素,尤其是区域因素的影响。

60～90 kaBP is the translation period between the last interglacial period and last glacial period, during which a lot of important climate events happened. Analysis helps us to know more about these climate mutation events and to provide new angles for understanding the climate drive mechanism. Based on a systematic review of ancient climate carrier research results, such as cave stalagmite and polar ice core during 60～90 kaBP, the relationship between the 72 kaBP climate mutation events and the Toba volcanic eruption was discussed. The analysis indicated that the 72 kaBP Toba volcanic eruption was not the leading factor of the 72 kaBP climate events, the boundary of the MIS4/5a conversion time was not the 72 kaBP climate events but the Dansgaard/Oeschger（D/O）20 event. The stalagmite record changing trend was basically consistent with the solar radiation curve in the late pleistocene epoch, but D/O18 mutation events had differences in different areas and ancient climate carriers,which showed global climate was influenced by solar radiation in long time scale, while it was controlled by many factors in short time scale, especially the influence of regional factors.