Accession Number : AD0658007

Title :   THE EFFECT OF HAZE UPON UMKEHR MEASUREMENTS,

Corporate Author : FLORIDA STATE UNIV TALLAHASSEE DEPT OF METEOROLOGY

Personal Author(s) : DeLuisi,John J.

Report Date : 01 JUL 1967

Pagination or Media Count : 175

Abstract : The use of Mie-scattering functions in a primary-scattering model show that haze affects an Umkehr curve by slightly increasing the N-values for zenith angles of about 60-75 degrees, and slightly decreasing the N-values for zenith angles of about 75-90 degrees. A cross-over point is implied. Another implication derived for the model calculations is that the type and amount of variation of the Umkehr curve depends mostly on the total optical depth of haze particles and not so much on the size distribution and refractive index of the haze particles, within reasonable limits of variation. The existence of simultaneous balloon-Umkehr data, obtained at Florida State University, permits an experimental analysis of the influence of haze upon Umkehr curves. Both model and experimental results show that for a C-wavelength-pair Umkehr curve that has been normalized to zero at a zenith angle of 60 degrees, the presence of haze decreases the N-values (on the average) by a maximum value of 2 at a zenith angle of 80 degrees. From the experimental haze residual, a total average optical depth of haze particles of .30-.33 is inferred for a standard clear atmosphere over Tallahassee. Umkehr curves that have been adjusted for an average haze effect produce ozone distributions that agree better with the simultaneously measured balloon ozone distributions. (Author)

Descriptors :   (*METEOROLOGICAL BALLOONS, OZONE), (*OZONE, *SPECTROPHOTOMETERS), INTENSITY, TEMPERATURE, MEASUREMENT, SURFACE PROPERTIES, AEROSOLS, THEORY, REFLECTION, PARTICLES, SCATTERING, TABLES(DATA), HAZE

Subject Categories : Meteorology

Distribution Statement : APPROVED FOR PUBLIC RELEASE