Abstract:
The characteristics of temporal and spatial of snow depth over the Eurasian for 30 years (1979—2009) have been studied in the light of the Empirical Orthogonal Function (EOF) and Continuous Wavelet Analysis.It shows that firstly the EOF1 analysis of snow depth over the Eurasian in autumn and winter,spring and summer indicates that the snow depth has obvious decadal variation characteristics.It presented interdecadal change in the early 1990s with consistent rising trend (before (after) 1991,the snow depth is negative (positive) ).Secondly,versus to the autumn and winter,the spring and summer EOF1 of snow depth over the Eurasian has weaker even less positive anomaly and stronger even more negative anomaly.Thirdly,the Continuous Wavelet Analysis shows that there are obvious oscillation periods of quasi-2 years and quasi-5 years,respectively in the middle of 1980s and the late of 1980s,the early of 1990s.It is worth noting that there are obvious oscillation periods of quasi-8 years in the whole 1990s.Comparing to autumn and winter,the spring and summer have more complex distribution feature.