Investigations of Wave-induced Nonlinear Response of Minor Species with the KBM Averaging Method

Simulations of gravity wave‐induced variations of the OH(8,3), O2(0,1), and O(1S) airglow emissions in the MLT region

“…There is mean state forcing due to the nonconservativeness of the wave packet, thus causing an irreversible change in the airglow intensities. The secular variations are proportional to the square of the wave amplitude [ Huang et al ., ; Huang , ], whereas the airglow fluctuation amplitudes have magnitudes similar to the amplitude of the gravity wave packet. The height‐integrated airglow fluctuations will be significantly reduced due to strong cancelations between airglow volume emission rate fluctuations at different altitudes for waves of short vertical wavelength.…”

“…By the end of the simulation time, the O( 1 S) greenline intensity has increased by ~33%, the O 2 (0,1) atmospheric band intensity has increased by 31%, and the OH(8,3) intensity has increased by 22%. Secular variations are proportional to the square of the gravity wave amplitude since they comprise nonlinear flux terms [ Hickey and Walterscheid , ; Huang et al ., ; Huang , ]. It is not surprising that the secular variations of O( 1 S) greenline are the largest of the three airglow emissions because the gravity wave packet's amplitude is larger at the O( 1 S) greenline peak altitude.…”