Abstract
Using geopotential data for three levels of 500mb, 100mb and 50mb during three month period from December 1957 to February 1958, the daily estimates have been made for the zonal mean wind, the zonal mean temperature, the momentum and sensible heat transports due to disturbances, and the zonal mean vertical velocity, to examine the variation of these quantities with respect to three phases before, during and after the warming phenomenon.
The spectral forms of the energy equations have been employed to discuss the energetics of dominant waves with wave numbers 1 and 2 in the stratospheric layer between 100mb and 50mb. From the measurements of the energy interaction terms, it was recognized that a rapid and large increase of the eddy kinetic energy for these waves was neither due to the barotropic nor due to the baroclinic instability. The following conclusion seems to be sure : the initial growth of the warming disturbances was accomplished, to a great extent, by vertical energy transfer across the upper and lower boundaries.
