Developmental stages of spring red snow phenomenon “Akashibo” at the Ozegahara district, Central Japan

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  • 尾瀬地域におけるアカシボの発達過程
  • オゼ チイキ ニ オケル アカシボ ノ ハッタツ カテイ

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Abstract

A large scale of red snow phenomena “Akashibo”appeared at Ozegahara Mire and Lake Ozenuma in Oze District during snow melting period. Five developmental stages of Akashibo are classified. (1)The first stage (Stage 1;white snow surface, the lower half of the snow depth colored reddish), (2) the middle stage (Stage 2; white snow surface or faintly colored,strongly red in the lower section (above about half of the snow accumulation), (3)the peak stage (Stage 3;entire snow patches are dark-red),(4)the end stage (Stage 4;accumulation of fresh Akashibo substances on soils or dead plants) and (5) the residual stage (Stage 5; Akashibo substances remaining on soils to fall). Development of Akashibo at Lake Ozenuma seemed to be essentially same as Ozegahara Mire, but showed unclear stages, because of rising lake water level.

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