中原末次冰期间冰阶以来的古季风气候变迁

The Paleoclimate Variations in the China Central Plains since the Interstade of the Last Glacial Stage

中原邙山黄土地层以巨厚的马兰黄土为特色。本文研究了末次冰期间冰阶以来邙山黄土－古土壤序列的粗颗粒含量和磁化率值曲线反映的冬夏季风变迁及其相互关系，发现在万年尺度上夏季风增强对应于冬季风减弱，冬季风增强对应于夏季风减弱，但在千年尺度上冬季风变化比夏季风强烈得多，而且末次间冰段开始时冬季风减弱明显早于夏季风增强。通过中原黄土记录与深海及冰芯Ｏ同位素记录的对比，发现短时间尺度气候变化阶段明显具有很大的区域性特征，它们不能简单地进行等时性全球对比，而应该通过各自独立的时间标尺来建立古气候变化的远距离联系。

Loess strata at Mangshan in the China Central Plains are characterized by the Malan loess with a huge thickness. This paper discusses the summer and winter monsoon climate variations and their interrelations recorded by the loess_paleosol sequence in Central Plains since the last interstade. It is revealed that on the 10000 a scale the enhanced summer monsoon corresponded to the declined winter monsoon, and vice versa, but on the 1000 a scale the winter monsoon varied much more intensely than the summer monsoon and the weakening of winter monsoon evidently preceded the strengthening of summer monsoon at the beginning of the last interstade. By comparing the loess record from Central Plains with the oxygen isotope records from deep sea and ice core, it is proposed that the short_term climatic changes imply a great deal of regional character and should be made a comparison of global extent only by independent timescale.