Microorganisms of the upper atmosphere. V. Relationship between frontal activity and the micropopulation at altitude.

The relationship between frontal activity and the micropopulation of the atmosphere at altitude is described. It is shown that certain of the meteorological events associated with frontal activity quantitatively modify the micropopulation of the atmosphere. Precipitation associated with frontal passage reduces the micropopulation at altitude, whereas frontal activity with high levels of associated surface and atmospheric turbulence results in great increases in micropopulations of the upper atmosphere-particularly in those situations where surface conditions are conductive to the development of dust.