SURFACE AND AIRBORNE CONDENSATION NUCLEI MEASUREMENTS IN REMOTE AREAS
ARMY ELECTRONICS COMMAND FORT MONMOUTH NJ
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Condensation nuclei concentration measurements were made in the vicinity of Flagstaff, Arizona, during July 1966. The purpose of these measurements was to determine typical nuclei concentrations in the area and to correlate concentration with time of day, elevation, and weather conditions. The measurements were made both near the surface and from an aircraft. From the aircraft measurements it was found that condensation nuclei concentrations decreased with elevation. There was no apparent difference between concentrations in clear air, clouds, or rain. The ground-level measurements, about one foot above the surface, indicated concentration of about 1000 to 1500 particles per cubic centimeter during sunrise and continuing for several hours thereafter. Sharp peaks in concentration occurred during the mid-day hours on each of the three days of ground-level measurements.