Variations in Air Temperature during the Last Century Revealed by delta18O in the Chongce Ice Core from the Tibetan Plateau

Through analyzing the isotopic ratio δ¹⁸O variation characteristics of Chongce ice core, it exhibited an increase trend in the 20th century, and the temperature near the Chongce Ice Cap rose about 1.1 °C during last century. Through wavelet analysis, the δ¹⁸O in Chongce ice core showed three heating periods and two cooling periods. The wavelet variance analysis of the isotopic ratio δ¹⁸O variation indicates 13-year, 25-year and qusia-46-year periods. Compared with the ground weather observation stations in the high north Tibetan Plateau and the low Taklimakan Desert, and the June-September mean temperature of the MUT (500hPa and 300hPa) above the whole Asia for 1948-92, the results show that the climatic information on the TP in Chongce ice core is likely very less, and the δ¹⁸O of Chongce ice core may represent the summer temperature of Taklimkan Desert and the summer temperature of the middle-upper tropsphere above the middle-high latitude Asia especially the central Asia.