In a recent study carried out with the Kühlungsborn Mechanistic general Circulation Model (KMCM), it was shown that the interhemispheric coupling mechanism has a net cooling effect on the summer polar mesospheres. Here the comprehensive Whole Atmosphere Community Climate Model (WACCM) is used to reconfirm the hypothesis that the summer polar mesosphere will be much warmer without a gravity wave driven residual circulation in the winter. It is also seen that the northern hemisphere summer polar mesosphere is most affected by the winter hemisphere. A parameterization of noctilucent clouds is made in WACCM. It is seen that without a residual circulation southern winter mesosphere, there are less clouds in the northern hemisphere summer mesopause. For noctilucent clouds in the southern hemisphere the effect is less clear, as expected.