A Numerical Investigation of the Atmospheric General Circulation and Stratospheric-Tropospheric Mass Exchange: I. Long-term Integration of a Simplified General Circulation Model

[摘要] For the purpose of investigating the general circulation of the atmosphere and Stratospheric-Tropospheric mass exchange, a simplified model was developed and time-integrated for 100 days. The model version is a 10 level primitive-equation model in p-coordinates. The computational domain is limited to 1/6 hemisphere under cyclic condition. Non-adiabatic terms are evaluated by employing the results of observational analyses. The vertical convective mixing and horizontal subgrid-scale diffusion of sensible heat are parameterized as the 6.5 deg/km convective adjustment and the so-called nonlinear viscosity, respectively.Numerical results are presented both from the description of time evolution of the model atmosphere and from a comparison of the period of model-60 days with climatological statistics. The time and zonal mean states of the model atmosphere are similar to the observations for winter more than for annual mean. The subtropical jet, tropical easterlies and meridional three cells are grossly well reproduced. In addition, the model simulates successfully the thermal structure with the tropical and mid-latitude tropopauses. However, the mid-latitude cyclones are less active than those of the real, though the dynamical and synoptic features are qualitatively well presented.

[学科分类] 大气科学