On Materials of Solid Particles Contained in Snow and Rain Water: Part 1

[摘要] Snow and rain water samples were collected at a site on the coast of the Hokuriku district in February and March 1970 and rain water samples were collected at a site on Mt. Odaigahara in July 1970. Solid particles contained in snow and rain water samples were analyzed by means of X-ray, infrared and electron optical methods. The results are summarized as follows: (1) Most of the solid particles in snow sample were found to be soil particles originated from the arid or semiarid regions of North China and Mongolia; these soil particles are considered to play an important role as ice nuclei in the formation of snow crystals in the season of north west monsoon. (2) At both sites, rain water samples precipitated from the air mass which did not pass through the arid or semiarid regions of the continent of Asia and stayed over the ocean for a long time contained a small quantity of solid particles. (3) Rain water samples collected from rainfall due to Typhoon 7002 contained a very small quantity of solid particles. Their materials were identified as α-quartz, α-cristobalite, pyroxene and unidentified mineral. It is suggested that these particles were of volcanic and other origins and suspended in the upper troposphere or the stratosphere.

[学科分类] 大气科学