Accession Number : AD0649317

Title :   APPLICATION OF DOPPLER RADAR TO STORM DYNAMICS.

Descriptive Note : Final Scientific rept., Dec 63-Dec 66,

Corporate Author : ALLIED RESEARCH ASSOCIATES INC CONCORD MASS ARACON GEOPHYSICS DIV

Personal Author(s) : Wexler,Raymond

Report Date : JAN 1967

Pagination or Media Count : 77

Abstract : The variance due to vertical wind shear is calculated for Doppler wind measurements using a realistic beam pattern. The effect of reflectivity changing with height is evaluated. The existence of horizontal wind shear is analyzed from measurements by Doppler radar in widespread precipitation. The method of determining wind velocity, divergence and deformation is summarized. By representing the distribution of precipitation fall speeds with a Gaussian function, rain intensity and liquid water content are determined as a function of the reflectivity, the mean fall velocity and the standard deviation. A case of sorting of a Marshall-Palmer drop size distribution is analyzed. Multigate Doppler observations in snow demonstrate the feasibility of measuring the translation, dimension and amplitude of microscale turbulence. Eddies at low levels have periods of about one minute and dimensions of 0.4 km. These increase at higher levels. (Author)

Descriptors :   (*METEOROLOGICAL RADAR, *DOPPLER RADAR), (*DOPPLER RADAR, STORMS), WIND, MEASUREMENT, ATMOSPHERIC PRECIPITATION, ATMOSPHERIC MOTION, DYNAMICS, METEOROLOGY

Subject Categories : Meteorology
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE