The annual cycle of snow cover extent over the northern hemisphere as revealed by noaa/nesdis satellite data
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概要
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The hemispheric distribution of the timing of appearance and disappearance of snow cover is obtained. Weekly digital data of snow cover for 17 years based on NOAA satellite observations are used. In plain areas, we find zonal pattern in median despite of patchy pattern in individual years. The phase lines are in general parallel to latitudinal circles, but there is considerable east-west gradient both in Eurasia and North America. Mountainous areas are characterized by late snowmelt, large variability or both.
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