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Observations of snow crystals in the lower atmosphere of Arctic Canada were made by means of snow crystal sondes. The number and shapes of crystals, the size distribution of hexagonal plates and columnar crystals at each observation height and the growth mode of columns were studied in the air temperature of -21 to -31*. The results show that snow crystals of peculiar shapes were involved constantly amounting to about 2.5% of total number in the height from surface to 150m. Although the predominant shapes of snow crystals were columns, single bullets, crossed plates and combination of bullets, hexagonal plates were also observed in considerable percentage. The growth mode of columns was similar to that of columnar crystals observed by Sato et al. (1981) at South Pole Station. The mean sizes of hexagonal plates and columnar crystals were gradually increased with the decrease of observation height. This may be due to the existence of enough amount of water vapor for growth of those crystals in the atmosphere near surface to several hundred meters in height, locally around the observation site. The mass growth rate of columns was 2.5*10-9g*sec-1 at the air temperature of -31* , and was larger than that obtained in field observation at -35* by Kikuchi and Hogan (1979) and that obtained in cold chamber experiment at -26* by Yamashita (1974). It seems that this discrepancy of mass growth rate at cold temperature regions is caused by the difference of size or mass of crystals.

Observation of Snow Crystals in the Lower Atmosphere of Arctic Canada by Means of "Snow Crystal Sondes"