Abstract: The multi-scale characteristics of the reconstructed temperature and glacier ice accumulation from Guliya ice core on the Tibetan Plateau are studied by orthogonal wavelet decomposition. The main characteristics of the two sequences can be almost totally reproduced by the components with the scales longer than 100 years, and the well-known climate events in the records can be fitted well by only one or several decomposed components. In addition, the records also show some unsteady properties of their components, by which a number of transient climate events can be interpreted well. Meanwhile the unsteadiness also exists in their collocation evolution although their correlation coefficients are almost positive except for the one at scale 130 years. Besides, the linear trend of temperature and millennia-scale components of the two sequences dominated their collocation evolution during 301-1990 AD.

Key words: Guliya ice core, orthogonal wavelets, temperature and ice accumulation, collocation, multi-scale characteristics, unsteadiness