中国不同区域MIS-3时期气候特征研究进展  

Progress in the Studies of Climatic Features in Different Areas of China during the MIS-3

作　　者：甄治国[1] 钟巍[1] 薛积彬[1] 郑琰明[1] 刘伟[1] 

机构地区：[1]华南师范大学地理科学科院,广东广州510631

出　　处：《冰川冻土》2008年第5期814-824,共11页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(40671189);广东省自然科学基金项目(06025042;031522);教育部霍英东基金项目(91021)资助

摘　　要：在对比分析前人对MIS-3阶段气候环境特征的研究基础上,通过冰芯、石笋氧同位素与磁化率等各种代用指标,对中国不同区域在MIS-3时期的气候环境特征及其原因进行了探讨.结果表明:中国不同区域MIS-3阶段的气候环境特征在大背景较为一致的条件下也存在一定的区域性差异.青藏高原在MIS-3阶段的早期(MIS-3c)和晚期(MIS-3a)较其它区域来说可能温度要高,降水量更为充沛,中期(MIS-3b)气候曾经一度变冷变干,存在着千年尺度的气候转换;东亚季风区主要以暖湿气候为主,西南季风区则以凉湿为主,而温湿的气候环境可能是MIS-3时期西北地区主要气候特征.区域对比研究还发现,Heinrich事件与D-O循环在中国不同地区同样着存在不少记录.Based on the study of some examples related to the oxygen isotope and magnetic susceptibility, the paleoclimatic features in different areas of China during the MIS-3 are discussed, and the causes of the climatic variations are sought. In general, during the MIS-3, the Tibetan Plateau was warmer and more humid than other areas in China, the paleoclimate was mainly warm and humid in the eastern monsoon areas but cool and humid in the western tropic areas, and was warm and humid in Northwest China. However, it had a little difference among sub-areas. The features of the MIS-3 in China were controlled by earth orbital parameters and monsoon circulation. The periodicity of climatic fluctuation during this period was roughly corresponding to the periodical change of astronomical precession. The strong heat energy would cause the ice-sheets shrinking in the high latitudes and the sea levels rising. The enhanced hot low pressure induced summer monsoon stronger from ocean and precipitation increasing. This was the major reason of increase in precipitation and temperature. At the same time, the response of Heinrieh events and D-O cycle also appeared in China.

关 键 词：MIS-3 气候变化 HEINRICH事件 D-O循环 

分 类 号：P534.63[天文地球—第四纪地质学]