Hydrodynamic tropospheric wave sources and their role in gravity wave climatology of the upper atmosphere from the MU radar observations

摘要

The results of measurements of generation of internal gravity waves (IGWs) in the troposphere by mesoscale dynamical processes with the MU radar are presented. Zonal and meridional horizontal nonlinear advective accelerations are estimated using eight directions of the MU radar antenna beam. Seasonal variations of the intensity of tropospheric IGW sources are discussed using the results of the observations in all seasons. A contribution of IGWs generated in the troposphere into dynamics of the mesosphere and lower thermosphere is considered by comparing the MU radar data with a theoretical model. Possible contribution of IGWs generated in the troposphere at middle and equatorial latitudes to interannual variations of the wave intensity and general circulation of the middle and upper atmosphere over the MU radar is discussed.