中更新世气候转型与100ka周期研究

中更新世气候转型是第四纪气候变化中最重要的特征之一，它是指全球气候的主导周期在中更新世时从41ka转变为100ka，且气候波动的幅度也加大。经典的Milankovitch假说不能完全解释中更新世气候转型的原因以及100ka周期在气候记录中的强烈表现，因为太阳辐射与气候记录之间存在着相当的差异，尤其是二者在变化幅度上不匹配。近年来围绕这一转型过程的时代和原因获得了一些新的进展，主要是针对中更新世气候转型的时间、对气候记录中100ka周期的重新检讨以及非太阳辐射因素在这一转型过程中所起的作用。其它可能的转型原因包括大冰盖、温室气体、地球轨道面倾角、冰盖基底、构造隆升等。

REVIEW OF STUDIES ON THE MID-PLEISTOCENE CLIMATIC TRANSITION AND THE 100 ka CYCLE

The Mid Pleistocene Climatic Transition (MPT) is one of the most significant characteristics of the Quaternary climatic changes. MPT means the dominant global climate cycle changed from 40 ka to 100 ka during the mid Pleistocene with higher amplitude. The classical Milankovitch hypothesis can't give a satisfactory explanation for the cause of the MPT and the predominant 100 ka cycle in climate records because of the discrepancy between solar insolation and climate records, especially the unmatched change amplitudes of them. This paper introduce the progresses of this question, such as the time of the MPT, the re examination on 100 ka cycle in paleoclimatic records, and the role of non insolation factors, such as the ice sheets, green house gas, ice sheet's underlying substrate, orbital plane inclination, and tectonic uplift.