Total snow water distributions in Tohoku region, Japan, averaged for twenty-seven years : Their application to heavy and light snowfall winters

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  • MOTOYA Ken
    Faculty of Education and Human Studies, Akita University,

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  • 東北地方における積雪水量の27年平均値と豪雪・寡雪
  • トウホク チホウ ニ オケル セキセツ スイリョウ ノ 27ネン ヘイキンチ ト ゴウセツ カセツ

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Daily distributions of the snow water equivalent in several 1×1 km 2 grids in the Tohoku region, Japan, were calculated for 27 winters between 1980 and 2007 by the simple snowmelt model (Motoya et al.2001) from routine meteorological data. Moreover, the quasi-climatic distributions of snow water were estimated from the 27-year average. The 27-year average cubic volume of total snow water amount at maximum was estimated to 26.1 km3 and the standard deviation of its long-term changes was estimated to 5.2 km3. The seasonal change in the total snow water in the heavy snowfall 2005-2006 winter of was similar in terms of the early growth of snow amount to the winter of 1980-81 that witnessed heavy snowfall ; however, the positive anomalies in coastal areas along the Japan Sea were more dominant in the winter of 2005-2006 than in that of 1980-1981. During the light snowfall 2006-2007 winter of , the negative anomalies of snow water in the Niigata region were larger than those of the light snowfall winter of 1980-1981; however, it has been found that the mountainous areas in the north of the Tohoku region witnessed an ordinary snow amount in the snowmelt season.

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