Climate Changes and Desert Evolution of Mu Us Desert since 15 ka BP
Climate Changes and Desert Evolution of Mu Us Desert since 15 ka BP
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发表时间：
2010
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通讯作者：
Zhang Deng-shan
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作者：
Zhang Deng-shan
通过对位于荒漠-黄土过渡区的三道沟剖面沉积物的分析，结合14C测年和光释光测年以及前人的研究，探讨了毛乌素沙漠15ka BP以来的气候变化和沙漠演化特征：（1）15ka之前BP,毛乌素沙漠经历了末次盛冰期末期,气候干冷,冬季风较强,沙漠面积扩大。(2)15～6.33 ka BP,气候较前期温暖,风力较弱,但沙丘为移动型,期间有一定的暖湿事件。(3)6.33～3.5 ka BP,冬季风较弱,夏季风较强。前期，气候温暖湿润，沙漠面积缩小，但也出现了干冷气候的波动，尤其是5ka BP左右的降温事件，在毛乌素沙漠有明显记录。(4)3.5 ka BP以来，冬季风再次偏强，夏季风减弱，气候干冷，风沙活动增强。
The transitional area between Mu Us Desert and Loess Plateau is typically sensitive to global changes,so this area is ideal for research of climate change and desert evolution.Through analysis on sediments in Sandaogou section that located on desert-loess transitional area,in combination with 14C dating and optically stimulated luminescence dating and the former researches,the characteristics of climate change and desert evolution in Mu Us Desert since15 ka BP are discussed:(1)Before 15 ka BP,Mu Us Desert experienced the late Last Glacial Maximum,the climate there was dry and cold,the winter monsoon was stronger and the deserts expanded.(2)15～6.33 ka BP,the climate was warmer and wind was weaker than before,but sand dunes were moving types.There were some warm-wet events during this period.(3)6.33～3.5 ka BP,winter monsoon was weaker and summer monsoon was stronger than before.The climate was warm and wet,and the deserts area contracted.But there also had some fluctuations of dry-cold climate,especially the cooling event occurred in about 5 ka BP,which was clearly recorded in Mu Us Desert.(4)Since 3.5 ka BP,the winter monsoon became stronger again and the summer monsoon was weaker,the climate was dry and cold,and aeolian activities became stronger.