Abstract
The effects on the semidiurnal lunar tide of the meridional temperature gradient and the associated zonal winds are discussed by a linear theory with a numerical method.
It is shown that the zonal wind, its horizontal shear, and its vertical shear affect the latitudinal distributions and the vertical wave length of the oscillation considerably.
For instance, the amplitude becomes larger in westerly winds than in easterly winds, and the vertical wave length is reduced by equator-symmetric easterly winds, but is lengthened by equator-symmetric westerly winds.
It is also shown that the effect of the meridional temperature gradient itself is also considerable, especially in the upper atmosphere.
It is suggested that the seasonal variation of the zonal wind system may be one of the important causes for the statistically observed seasonal variation of the lunar tide.
