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

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 Aller d 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.