A prompt report on record-breaking snow water scarcity in 2020 in Japan

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  • 2020年の記録的少雪に関する速報的分析
  • 2020ネン ノ キロクテキ ショウ ユキ ニ カンスル ソクホウテキ ブンセキ

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Abstract

<p>　A continuous 60-year hydrological simulation has revealed that snow water equivalent (SWE) in 2020 is the least in many river basins in Japan over past 60 years. To investigate significance and reasons of the record-breaking snow scarcity in 2020, we used a standardized index, which is computed by applying the Box-Cox transformation to annual SWE, precipitation, and temperature estimates averaged over individual river basins. The standardized index indicated that SWE was lowest due to the highest temperature in Kanto region. In contrast, low SWE scarcity in Hokkaido was caused not by warmer temperature, but by lower precipitation. These analyses revealed that a major factor of snow scarcity is different between Hokkaido and the other regions.</p>

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