Investigation on Role of Low Level Cloud Seeding Aimed at Fog Dispersion in Mountainous Area of Iran

Fog is one of the meteorological events, which decreases horizontal and vertical visibility. Despite of usefulness in agriculture and protection for plants freezing; it has an important role in life and poverty damages in transportation section. This natural and destructive event causes major difficulties in aviation and prevents from flight operations. Generally, in order to fog dispersion and clearing weather, at first, it should be get knowledge of formation and types of fog and investigate this important meteorological event in detail, then the method of application of new technologies, such as fog dissipation using cloud seeding technology and also it’s application should be performed. Therefore, in this paper, after a review on formation and physical construction of fog, long term data and diagrams of foggy days in 30 cities of Iran country and zoning maps have been produced, then field research results of fog dissipation in different regions of Iran has been discussed.The result of field test indicates cloud seeding method using liquid carbon dioxide by moving vehicle for supercooled fog as one of the best methods, which causes clearing weather and increasing visibility field after 30 minutes. The successful results of this test indicate this fact which successful cloud seeding methods could be applied for fog dissipation and clearing atmosphere. In Last part of paper, numerical microphysical processes of supercooled cloud seeding have been discussed.