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Geochemical Features of a Profile in Salawusu River Valley and Their Response to Global Climate Changes since 220 ka BP

JIN He-ling~1,2, LI Ming-qi~1, SU Zhi-zhu~3, DONG Guang-rong~1, ZHAO Hui~1(1.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China;2.School of Resources and Environment,Lanzhou University,Lanzhou Gansu 730000,China;3.Center for Desertification Control,Chinese Academy of Forestry Sciences,Beijing 100091,China)  
The Salawusu River Basin is situated on the transition zone between desert and loess in North China and characterized a vulnerable ecotone,which sensitively responses to the global climate change.So,the basin is an ideal zone for studying climate changes in China.Commonly,the geochemical elemental oxides and their ratio can well reflect environmental change,which have been widely applied in the researches of Quaternary environmental and climatic changes.An ideal profile-Dishaogouwan Profile in Salawusu River basin was selected to study the climate changes in North China.The vertical sequence of geochemical elements and their ratios in the profile all indicated that the climate in North China has been very unstable since the Penultimate Interglacial Period,with frequent climate changes in different time periods.The climate of whether in the Ice Age or in the Interglacial Period was unstable.The climatic indexes in the Dishaogouwan Profile showed that there were three climatic fluctuations in the Penultimate Interglaciation,seven climatic cycles in the Penultimate Glaciation,seven cycles in the Last Interglaciation,and nine cycles in the Last Glaciation.These climate changes are well accordant with the global climate changes recorded in the deep-sea oxygen isotope and the polar ice cores,showing a consistency in time of climate changes between the study area and the globe.
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