Breaking of a upward propagating gravity wave packet

Numerical simulation of breaking of gravity wave packets with Gaussian dist ribution propagate upward in a compressible atmosphere is presented by usin g 2-D FICE scheme. The numerical analyses show that wave-associated disturb ance velocities increase with the height until close to the threshold value given by the linear theory, the gravity wave packet is saturate and then b reaking. The height (86.50km) wave breaking occurs is a bit higher than the height (84.59km) given by the linear theory, and wave breaking often occur s at the downstream region of wave packet The wave breaking can redistribut e the wave-associated energy in space and obviously dissipate the wave-asso ciated energy. Furthermore the wave breaking can differ the propagation dir ection of wave-associated energy from the ray path given by linear theory.