Accession Number : AD0603729

Title :   ON THE TWO-DIMENSIONAL SPECTRAL ANALYSIS OF KINETIC ENERGY OVER A CIRCUMPOLAR AREA OF A SPHERE.

Descriptive Note : Technical note no. 5,

Corporate Author : TECHNISCHE HOCHSCHULE DARMSTADT (GERMANY)

Personal Author(s) : Mesinger,F.

Report Date : 31 DEC 1963

Pagination or Media Count : 48

Abstract : Two possibilities for the two-dimensional spectral analysis of kinetic energy of flow-fields (on spherical earth) are discussed: one using the associated Legendre polynomials for meridional representation, and the other the sin functions with a latitude-dependent amplitude factor. The latter method is applied to the analysis of some 500 mb observed and barotropically predicted wind fields. The obtained two-dimensional and resulting onedimensional spectral distributions are described. A fair similarity is observed between the meridional spectra of zonal motion and zonal spectra of meridional motion, and between the meridional spectra of meridional motion and zonal spectra of zonal motion. Differences in time variations of observed and predicted spectra are treated: predicted spectra showed considerably smaller time variability. Data on the influence of the viscosity term on the spectra are presented. (Author)

Descriptors :   (*WIND, ATMOSPHERIC MOTION), (*TURBULENCE, ATMOSPHERIC MOTION), KINETIC THEORY, ONE DIMENSIONAL FLOW, TWO DIMENSIONAL FLOW, SPECTROSCOPY, POLAR REGIONS, AIR, WEST GERMANY

Distribution Statement : APPROVED FOR PUBLIC RELEASE