
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 Miescattering functions in a primaryscattering model show that haze affects an Umkehr curve by slightly increasing the Nvalues for zenith angles of about 6075 degrees, and slightly decreasing the Nvalues for zenith angles of about 7590 degrees. A crossover 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 balloonUmkehr 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 Cwavelengthpair Umkehr curve that has been normalized to zero at a zenith angle of 60 degrees, the presence of haze decreases the Nvalues (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