PEAT RECORD OF HOLOCENE CLIMATE CHANGE IN THE YANGBAJING BASIN, TIBET PLATEAU

There is a vast peat land in the Qinonggou(QNG) of the Yangbajing Basin next to the southern margin of the Nianqing Tanggula Mountain, Tibet Plateau. By extracting the humification and total organic carbon(TOC)data from the peat in QNG, combined with the ¹⁴C dating control, we have reconstructed the Holocene palaeoclimatic variation from 9.1 to 3.5 cal.kaBP at the Yangbajing Basin. On stage I, during 9.1~7.4 cal.kaBP,the temperature showed a fluctuating upward trend. Two obvious cold events occurred in 9.1 cal.kaBP and 8.0 cal.kaBP. On stage Ⅱ, of 7.4~4.7 cal.kaBP, the temperature fluctuation was frequent and intense. Two obvious cold events occurred in 6.0 cal.kaBP and 5.8 cal.kaBP respectively. On stage Ⅲ, during 4.7~3.5 cal.kaBP, the temperature showed a fluctuating downward trend. But the frequency and amplitude of the changes were much tender than those of the second stage. There only occurred a relative significant cold event at 4.0 cal.kaBP.