Studies on Fractionation of Chemical Constituents in Snowpack at the Time of Snowmelt and Formation of Ice Body in Snow Patch.

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Many snow patches have ice bdoy at the bottom. They are formed not only by the refreezing of percorated snowmelt water in the early spring, but also by the refreezing of meltwater stored over the ice body in late autumn. The chemical constituents in the firn and their amout are substantially affected by the snowmelt water.There are two types of snow patches distinguished by its formation. One is a snow drift type and another is a avalanch accumulated type. The avalanch accumulated type rarely has ice body at teh bottom due to the large thichness, which prevents cold wave penetration and therefore refreezing of meltwater stored inside the snow patch.