Accession Number : AD0755441

Title :   Doppler Turbulence Measurements in an Evaporating 'Stalactite' Cloud Base Zone.

Descriptive Note : Technical rept.,

Corporate Author : CHICAGO UNIV ILL LAB FOR ATMOSPHERIC PROBING

Personal Author(s) : Atlas,D. ; Sekhon,R. S. ; Serafin,R. J.

Report Date : 01 JUL 1972

Pagination or Media Count : 25

Abstract : The evaporating base of an ice crystal cloud deck is commonly marked by mammata-form vertical appendages which have come to be called 'stalactites'. Because this zone is cooled by evaporation from above, its lower portion becomes convectively unstable and turbulence may result (Atlas, 1955). The primary objective of this work is to measure and describe the vertical air motions in a case of moderate turbulence associated with a stalactite zone. A secondary goal is to assess the validity of the use of the root mean square (rms) Doppler velocity in lieu of the mean Doppler velocity in turbulence (and other) measurements. This problem is of interest because the former is simpler to measure than the latter and is in more widespread use.

Descriptors :   (*ATMOSPHERIC MOTION, RADAR REFLECTIONS), METEOROLOGICAL RADAR, DOPPLER RADAR, TURBULENCE, DOPPLER EFFECT

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE