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中文摘要：
通过柴达木盆地东南缘下西台剖面风成沉积粒度组成、元素含量等指标的分析,重建了该区5000a来冬季风的演化历史。其可划分为4个阶段：5300～4300aBP和2900～930aBP时期冬季风较弱;4300～2900aBP和930aBP以来冬季风较强。同时,该记录揭示了两次气候突变事件：3960～3720aBP,冬季风急剧减弱;而1700～1400aBP冬季风增强。重建结果与其他记录具有很好的可比性。在千年尺度上,下西台剖面所记录的冬季风演化与格陵兰冰芯的粉尘记录存在一定的联系,意味着源区近地面风场的变化在全球粉尘循环过程中起着重要的作用。柴达木盆地可能为东亚粉尘远程输送的主要源区之一。
英文摘要：
Atmospheric dust plays an important role in the global climate change. The Qaidam Basin, as one of the Asian dust source areas, can provide a great deal of mineral dust for deflation. Wind strength in the source areas is crucial for dust particle uptake. Grain size and elemental composition of the aeolian deposits at the southeastern margin of the Qaidam Basin were investigated to reconstruct the change of winter monsoon over the last 5000 years. The fractions of 40 μm and 140～250 μm and the ratio of SiO2 to TiO2 were used as indicators of winter monsoon. In light of five controlling ages, the change of winter monsoon can be divided into four stages. Winter monsoon was very weak in 5300～4300 a BP and 2900～930 a BP; whereas in 4300～2900 a BP and 934 a BP it was rather stronger. Two abrupt winter monsoon changes were observed at 3960～3720 a BP and 1700～1400 a BP. The former event is characterized by sharp weakening and the latter became intensive. The reconstructed results are broadly in agreement with other records from the adjacent regions. However, the decreasing trend of winter monsoon during 2900～930 a BP is most likely related to high temperature in East China at that time, which was inferred from historical documents. There＇s a close relation between the winter monsoon evolution records from the Xiaxitai sections and dust record of the Greenland ice core. Near-surface wind regime in dust source areas may play an important role in global atmospheric dust circulation. In addition, Qaidam Basin may be one of the important dust source regions in eastern Asian dust long-range transportation.
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