By means of highly truncated spherical harmonic expansions, an extended four-level quasi-geostrophic model with variable Coriolis parameter is transformed into a set of ordinary non-linear differential equations. Non-adiabatic effects, frictional dissipation, and boundary effects are approximately included in the equations. A numerical experiment made with the equations succeeds in producing many realistic statistical gross features, especially in the lower stratosphere, e. g., a poleward temperature incrase, the up-gradient horizontal transports of heat and momentum due to large-scale eddies, the upward energy flux of extra-long waves, and the trapping of the upward energy flux of tropospheric unstable waves near the tropopause. The mean energy flow in the lower stratosphere and in the troposphere are analyzed and compared with each other, indicating very clearly the baroclinical activness of the troposphere and the passiveness of the lower stratosphere. The dynamics in the lower stratosphere are discussed. the mean meridional circulation is also studied.
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Peng, L. A simple numerical experiment concerning the general circulation in the lower stratosphere. PAGEOPH 61, 191–218 (1965). https://doi.org/10.1007/BF00875777
- Numerical Experiment
- Boundary Effect
- Meridional Circulation
- Lower Stratosphere
- Coriolis Parameter