Abstract
Progress in reconstructing the mechanism of the influence of drifting snow on changes in the ice surface elevation, when it moves with velocity of 2–5 m/year, was achieved owing to space-based laser altimetry and the discovery of fractal patterns of the elevation fluctuations. They consist in the growth of variance of elevation changes by an increased lag. The variance grows in the power law dependence in the scaling range of 70 km. The wavelet analysis revealed a wide spectrum of spatial frequencies and demonstrated that they occur in the range of 1.4–22.5 km–1. The discovered properties of changes in the surface elevation subordinate to the Gaussian distribution with zero mean indicate dynamic equilibrium of the present-day Antarctic ice sheet.
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