中晚全新世科尔沁沙地演化与气候变化  

Desert Evolution and Climate Change in the Horqin Sandy Land in Middle and Late Holocene

作　　者：刘冰[1] 靳鹤龄[1] 孙忠[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所沙漠与沙漠化重点实验室,甘肃兰州730000

出　　处：《中国沙漠》2013年第1期77-86,共10页Journal of Desert Research

基　　金：中国科学院重点部署项目(KZZD-EW-04-04);国家自然科学基金项目(41271215)共同资助

摘　　要：科尔沁沙地位于东亚季风区的东北缘,环境对气候变化反应非常敏感。地层沉积相、粒度与地球化学参数表明中晚全新世科尔沁沙地环境与气候变化可以分为以下3个阶段:7.0～3.6cal ka BP,沙地逐渐固定、缩小,冬季风减弱,夏季风不断增强,气候趋于暖湿;3.6～1.3cal ka BP,沙地总体上较为稳定,但也存在活化、扩张,与上一阶段相比夏季风强度有所降低,但仍强于冬季风,气候相对暖湿;1.3～0.65cal ka BP,沙地出现多次活化、扩张和固定、缩小,冬夏季风交替频繁,气候呈现冷干-相对暖湿的组合。具体来讲,中晚全新世以来科尔沁沙地存在8次活化、扩张和8次固定、缩小期,气候变化也存在8次冷干和8次相对暖湿期,两者存在明显的对应关系。太阳辐射与全球冰量变化是中晚全新世科尔沁沙地演化与气候格局的主要驱动力。The Horqin Sandy Land is located in northeastern edge of the East Asian monsoonal regions,and its natural environment is sensitive to the climate change.The sedimentary facies,grain size and geochemical parameters suggest environment and climate changes in the Horqin Sandy Land can be classified into 3 stages.In 7.0-3.6 cal ka BP,the sandy land was gradually fixed and shrank,accompanying the increased summer monsoon and weakened winter monsoon.The climate tended to be warm and wet in this period.In 3.6-1.3 cal ka BP,the sandy land kept stable in general with some activating and expanding phase.Compared with the aforementioned stage,the summer monsoon strength declined but it was still higher than the winter monsoon.The climate became relatively warm and humid.In 1.3-0.65 cal ka BP,with frequently alternations of the summer and winter monsoon,the sandy land had experienced several alternations of activation-expansion and fixing-shrinkage.The climate performed alternations of cold-dry and relatively warm-wet.Specifically,the desert evolution in the Horqin Sandy Land presented 8 activation-expansion phases and 8 fixing-shrinkage phases since the Mid-Holocene.The climate change also showed 8 cold-dry phases and 8 relatively warm-wet phases,which was obviously corresponding to the desert evolution.The desert evolution and climatic change in the Horqin Sandy land can be attributed to the variation of solar radiation and global ice volume.

关 键 词：中晚全新世 科尔沁沙地 沙漠演化 气候变化 

分 类 号：P532[天文地球—古生物学与地层学]