Chemical dynamics of snow and stream water in the Japanese Alps

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  • KURAMOTO Takayuki
    Department of Environmental Sciences,Faculty of Science,Shinshu University
  • SUZUKI Keisuke
    Department of Environmental Sciences,Faculty of Science,Shinshu University Institute of Mountain Science,Shinshu University

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  • 北アルプス源流域における積雪中の化学物質動態と河川水質変動
  • キタアルプス ゲンリュウイキ ニ オケル セキセツ チュウ ノ カガク ブッシツ ドウタイ ト カセン スイシツ ヘンドウ

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Abstract

Chemical studies of snow and stream water were conducted from December 2004 to April 2005.The experimental site was a headwater watershed on the east side of the Japanese Alps, which is under heavy snow cover in winter.The altitude of the experimental site is around 1050m to 1965m.The pH of the snow was low.The chemical features of the snow exhibited different structures in each layer.The concentration of ions in the layers of the snow varied with the atmospheric pressure pattern during snowfall.The chemical concentration of the snow remained the same until the snowmelt season.Afterwards, it began to decrease with the snowmelt water.The chemistry of the stream water changed with an increase in the runoff during the snowmelt season.The concentration of NO3- and Cl- increased significantly with an increase in the runoff in the early stages.Simultaneously, the pH and EC also decreased.The discharge exhibited a diurnal variation from April 15th through April 30th, 2005.The ionic balance of the stream water changed significantly.

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