Abstract We investigate the impact of the 2008–2009 sudden stratospheric warming (SSW) event on the mesosphere, thermosphere, and ionosphere under conditions of doubled carbon dioxide (CO 2 ). Using the Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere‐ionosphere eXtension model, we perform two simulations for the 2008–2009 SSW event—a control run and a run with 2 × CO 2 concentration. Our results indicate that the zonal mean response of the upper atmosphere to the SSW is substantially modulated by 2 × CO 2 . During the SSW, the migrating solar semidiurnal tide (SW2) shows a ∼20% change in the lower thermosphere at around 2 × 10 −5 hPa (∼115 km) under 2 × CO 2 relative to the control. SSW‐driven variations in thermospheric O/N 2 is modified up to ∼3% under the 2 × CO 2 case. In the ionosphere, SSW‐related reduction in zonal mean electron density in the control run at equatorial and low latitudes is further modulated up to ∼8% under 2 × CO 2 conditions.
Kumar et al. (Thu,) studied this question.
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