Analytic study on the mechanism for low frequency teleconnection and horizontal propagation in the atmosphere

摘要

Assuming that there is a zero-divergent layer in mid-troposphere, a diabatic and quasi-geostrophic equa- tion set (bearing the format of that for barotropic vorticity) is derived by vertical integration of the thermody- namics equation and approximate description of anomalous tropospheric heating field in a simultaneous equation. Discussing the spectral mean and group velocities, it is proved that the enclosed centers of the climatically Mean geopotential field are no other than the atmospheric low-frequency oscillators in the mid-and higher-lati- Tudes.