Desert Evolution and Climate Change of Southern Margin of Tengger Desert since Last Glacial Maximum
腾格里沙漠南缘末次冰盛期以来沙漠演化与气候变化

Located at the margin of the East Asian monsoon region,the desert-loess transitional zone is characterized by high instability.Since the Last Glacial Maximum,this area has experienced dramatic environment change.In detail,the boundary of loess-desert moved southward during warm/humid period and northward in cold/dry period.To investigate the Tengger desert evolvement,here we report the data of grain size,color reflectance,and CaCO_3 content of the loess-paleosol-eolian sand profile in Baiyangou located at the southern margin of the Tengger desert.Two times of widely expansion and retreat with one small scale expansion of the Tengger desert have been detected since Last Glacial Maximum.We proposed that the fluctuation of the East Asian monsoon controlled by the global change,is the driving force of the expansion and retreat of the Tengger desert.