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CLIMATIC-ENVIRONMENTAL EVOLUTION IN GAHAI LAKE AREA SINCE THE LATE GLACIAL PERIOD FROM LOSS-ON-IGNITION

CHEN Zhong1,MA Hai-zhou1,CAO Guang-chao1,2,ZHANG Xi-ying1,ZHOU Du-jun1,YAO Yuan3,GAO Zhang-hong1,TAN Hong-bing1(1 Qinghai Institute of Salt Lake,CAS,Xining 810008,China;2 College of Life and Geography Science,Qinghai Normal University,Xining 810008,China;3 Nanjing Institute of Geography and limnology,CAS,Nanjing 210008,China)  
Based on analyses of Loss-on-Ignition(LOI),carbonate content and sediment characteristics,the authors reconstruct the climatic and environmental evolution of the Gahai Lake area since the Late Glacial period.The results cover the Allerd period(between 12 710 and 12 380 cal.aBP),the Younger Dryas period(between 12 380 and 11 360 cal.aBP),and the Holocene.The Holocene can be divided into three periods: the early Holocene(11 360~8 240 cal.aBP),which was dry but unstable and featured rising temperatures;the mid-Holocene(8 240~3 200 cal.aBP),which was warm and wet in early period and cool and dry in late period;and the late Holocene(since 3 200 cal.aBP),which was cold and dry in early period and relativele warm and dry in late period.Results also show a warm-wet event around 1 500 cal.aBP.
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