Dynamical interactions between tropospheric and stratospheric layers have recently received increasing attention. These interactions intensify during stratospheric warming (SW) events. In this study, numerical simulations have been performed to estimate the transformation of the mean meridional circulation in altitude range 0 – 100 km at different phases of simulated SW events in January-February including and excluding impact of mesoscale orographic gravity waves (OGWs). To achieve statistical significance an ensemble of 12 pairs of model runs with and without a parameterization of OGW effects has been performed using the numerical middle and upper atmosphere model (MUAM).