Accession Number:

AD0442533

Title:

OBSERVATIONS UPON CLEAR-AIR STRATIFICATION IN THE LOWER TROPOSPHERE,

Descriptive Note:

Corporate Author:

UNIVERSITY OF WESTERN ONTARIO LONDON

Personal Author(s):

Report Date:

1963-07-19

Pagination or Media Count:

14.0

Abstract:

A study of the fine structure of air refractivity in the lower troposphere continued through the spring and summer of 1962 by observation of weak radio reflections from clear air radar angels, with a vertically directed radar of special design operating at 6770 Mcs. These observations were limited to the layer of frictional influence, within 1500 meters of the surface. The interpretation suggests that the reflecting centers are broad strata whose refractivity contrasts weakly with that of their environment, whose vertical depths are no more than a few centimeters, and which are either flat over horizontal distances of at least several meters or concave downwards with radii of curvature somewhat less than their height above ground. The incidence of transitory reflections generally follows a regular distribution in the vertical, with a maximum at 300 meters the form of this distribution is modified by the intrusion of weather fronts, thermals, and other clearweather structures. The transitory reflecting stratum is cut off from its generating source early in its life history, to be dispersed into its environment by molecular or eddy diffusion. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE