| Abstract: | According to the evolutionary processes of stable oxygen isotope in lake water, a physical model has been established to calculate paleotemperature and used to quantitatively rebuild the temperature sequences in the past 200 ka in Zoigê basin, eastern Tibet. The results show that in the Zoigê region the maximum temperature of the period equivalent to stage 7 in deep-sea stable oxygen record was 2.7℃ higher than that of the present; in stage 6, it was 4.3℃ lower and the value of the peak temperature of stage 5 was 5.2℃ higher than the present air temperature; in stage 4, the average temperature was 2-3℃ lower; in stage 3, the curve of the temperature estimated displayed the character of two peaks and one valley, and the value of the temperature difference in the period was above 4℃. Moreover, by comparing the tendency of the curves of paleotemperature calculated and responsive stable oxygen isotope of authicarbonate,we also found that during stage 6 the environment in the Zoigê basin was extraordinary, inferring that the stage represented a transition period from warm-dry and cold-wet to warm-wet and cold-dry. |
