Global energetics analysis using 3-dimensional normal mode decomposition

The Goddard Laboratory for Atmospheric Sciences (GLAS) analysis of the FGGE observations for a 25-day period in January 1979 is examined using the normal mode energetics scheme. The results from the energetics analysis are compared with the data of Tanaka (1985). Kinetic energy spectra of the barotropic mode in the meridional-mode and frequency domains, and the total diabatic process are studied. It is observed that there are significant differences between GLAS and GFDL analyses results in the barotropic energy of gravity modes and the normal energetics scheme is applicable as a diagnostic tool.