极地研究

极地研究 ›› 2003, Vol. 14 ›› Issue (1-English): 12-23.

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Densification and grain coarsening of melting snow

 Zhou Shiqiao1, Nakawo M.2, Hashimoto S.3, Sakai A.3, Narita H.4 and Ishikawa N.4   

  1. 1 College of Resources and Environment, Human Normal University, Changsha 410081, China;
    2 Research Institute for Humanity and Nature, Kyoto 602-0878, Japan;
    3 Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan;
    4 Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan
  • 出版日期:1953-03-30 发布日期:1953-03-30
  • 通讯作者: Zhou Shiqiao

Densification and grain coarsening of melting snow

 Zhou Shiqiao1, Nakawo M.2, Hashimoto S.3, Sakai A.3, Narita H.4 and Ishikawa N.4   

  1. 1 College of Resources and Environment, Human Normal University, Changsha 410081, China;
    2 Research Institute for Humanity and Nature, Kyoto 602-0878, Japan;
    3 Graduate School of Environmental Studies, Nagoya University, Nagoya 464-8601, Japan;
    4 Institute of Low Temperature Science, Hokkaido University, Sapporo 060-0819, Japan
  • Online:1953-03-30 Published:1953-03-30
  • Contact: Zhou Shiqiao

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摘要：

A field work was conducted at Moshiri in Japan. The work included intensive snow pit work, taking snow grain photos, recording snow and air temperatures, as well as measuring snow water content. By treating the snow as a viscous fluid, it is found that the snow compactive viscosity decreases as the density increases, which is opposite to the relation for dry snow. Based on the measurements of snow grain size, it is shown that, similar to the watersaturated snow, the frequency distributions of grain size at different times almost have the same shape. This reveals that the waterunsaturated melting snow holds the same graincoarsening behavior as the watersaturated snow does. It is also shown that the waterunsaturated melting snow coarsens much more slowly than the watersaturated snow. The C value, which is the viscosity when the snow density is zero, is related to the mean grain size and found to decrease with increasing grain size. The decreasing rate of C value increases with decreasing graincoarsening rate.

关键词: Melting snow, densification, grain coarsening

Abstract:

A field work was conducted at Moshiri in Japan. The work included intensive snow pit work, taking snow grain photos, recording snow and air temperatures, as well as measuring snow water content. By treating the snow as a viscous fluid, it is found that the snow compactive viscosity decreases as the density increases, which is opposite to the relation for dry snow. Based on the measurements of snow grain size, it is shown that, similar to the watersaturated snow, the frequency distributions of grain size at different times almost have the same shape. This reveals that the waterunsaturated melting snow holds the same graincoarsening behavior as the watersaturated snow does. It is also shown that the waterunsaturated melting snow coarsens much more slowly than the watersaturated snow. The C value, which is the viscosity when the snow density is zero, is related to the mean grain size and found to decrease with increasing grain size. The decreasing rate of C value increases with decreasing graincoarsening rate.

Key words: Melting snow, densification, grain coarsening