Numerical simulation of the influence of changing rotation rate on the general circulation of the Earth´s atmosphere

By using the second version of the Community Atmosphere Model (CAM2) of NCAR, the general circulations of the Earth´s atmosphere were simulated under different rotation rates conditions. The results imply that the intensity of three-cell circulation turn strong when the rotation rate turn slow. Furthermore, under slow rotation rate, for annual mean temperature field, there exist the negative anomalies in the Northern Hemisphere and positive anomalies in the Southern Hemisphere. The region of negative anomaly and that of positive anomaly are divided by 15°S. The annual mean zonal wind field has positive anomaly and negative anomaly when the roattion rate is changed. The positive anomalies and negative anomalies are cross. Compared with summer and autumn, in spring, the changes of geopotential height field, temperature field, meridional wind field in the stratosphere and vertical velocity field are opposite under different rotation rates. Compared with annual mean result, the situation of these three fields is reverse. The westerly in mid-latitude are all strengthened in four seasons under slow rotation rate. The change trends of the zonal wind in two Hemisphere are opposite in spring and autumn. The changes of physical quantities have significant seasonal difference. The change in autumn is the biggest. For monsoon, there are three regions of the linear response - African, Middle East and temperate zone and Frigid Zone.