Atmospheric gravity wave excitation through sum nonresonant interaction

Applying a fully nonlinear numerical scheme, sum nonresonant interaction of gravity waves is studied. The process of new wave excitation clearly exhibits that sum nonresonant interaction not only can happen in the atmosphere, but also has a considerable energy exchange magnitude, which is comparable to that of resonant interaction. The interacting waves have almost steady wavelengths and obey the dispersion relation of gravity waves, which differs from the results in the weak interaction theory. Despite the lack of the resonant condition restriction, nonresonant interactions depend on the detuning degrees of interactions.

► Sum nonresonant excitation of gravity waves is clearly exhibited for the first time.
► Intense energy exchange may arise in sum nonresonant interaction.
► Interacting waves have almost steady wavelengths and obey the dispersion relation.
► Nonresonant interactions depend on the detuning degrees of interactions.