It is shown by the results measured that the eddies with temperature sharp changing section viz temperature discontinuous surface (TDS) may frequently occur in a stratified turbulent medium. Because the TDS structure is very asymmetrical, the properties of light propagation would depart from the theory of isotropic turbulence. The appearance of TDS is probably related to removal of eddies in the vertical direction. The production and removal of these eddies can be named "bursts."