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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.