Generation of Inertia–Gravity Waves in a Simulated Life Cycle of Baroclinic Instability

摘要: Abstract The excitation and propagation of inertia–gravity waves (IGWs) generated by an unstable baroclinic wave was examined with a high-resolution 3D nonlinear numerical model. IGWs arose spontaneously as the tropospheric jetstream distorted instability strong parcel accelerations took place, primarily in exit region upper troposphere. Subsequent occurred regions windspeed-in stratospheric jets, cutoff low formed during lifecycle. on flanks these jets were rotated inward differential advection subsequently absorbed model's hyperdiffusion. Although absorption at sidewalls jet is artifact model, IGW for most pan confined to intrinsic period shorter than local inertial period. Only few able penetrate middle stratosphere, due weak winds or unfavorable alignment waveve...