Gravity Wave and Inertial Instability——Possible Mechanism of Atmospheric Turbulence and Airplane Bumps

The gravity waves associated with jet and aircraft upset are investigated by using an extended normal mode method.The analytical solutions indicate that gravity waves may be unstable and lead to breaking and turbulence when the stratified flow satisfies the inertial unstable conditions on the southern part of the jet axes,where the wind-shear with the anti-cyclone.However,on the northern part of jet,gravity waves may be unstable and lead to breaking and turbulence when the stratified flow satisfies the convective unstable conditions,where the wind-shear with cyclone.Most importantly,the relationship of airplane upset with wind field under the various atmospheric stability conditions is discussed and help to improve the ability of forecasting the clear air turbulence and airplane upset.