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Figure 60. Spatially distributed patterns of autocorrelations computed for annual snow accumulation on glaciers and for annual precipitation at 1,000- to 1,500-m elevation in the Northern Hemisphere. From meteorological stations, National Climate Data Center (NCDC) database. The winter snow accumulation, b_w, is the maximum amount of snow accumulation measured at the glacier surface at the end of accumulation season. These bw are usually 20 to 30 percent less than the annual amount of snow accumulation.