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The relations between δ18O and temperature on the different time scales were analysed,according to the data from Tuotuohe (34°13N, 96°25E; 4533 m a. s. l. ), Delingha (37°22N,97°22E; 2981 m a. s. l. ) and Xining (36°37N, 101°46E; 2261 m a. s. l.