MID-HOLOCENE CLIMATE VARIATIONS FROM LAKE RECORDS OF NW TENGGER DESERT

QTL section of 6.92 m depth is taken from Qingtu palaeolake, the terminal lake of Shiyang drainage located in NW Tengger Desert. Based on the detailed dating results, multi-proxy analysis of QTL section, including grain size, carbonate, TOC, C/N and δ¹³C of organic matter, was used to document regional climatic changes during 9~3 cal.kaBP. The climate evolution in the study area during 9~3 cal.kaBP is divided into four stages:①from cold and dry to warm and humid during the period of 9~7.8 cal.kaBP, ②a significant drought interval of multicentennial scale between 7.8~7.5 cal.kaBP, ③Holocene optimum characterized by a warm and moist climate during the period of 7.5~5 cal.kaBP, ④from humid to dry during 5~3 cal.kaBP.