[1] We investigate the influence of major sudden stratospheric warming (SSW) and elevated stratopause (ES) events in the Northern Hemisphere winter on the transport of NO x produced by energetic particle precipitation (EPP) from the mesosphere-lower thermosphere to the stratosphere using the Whole Atmosphere Community Climate Model (WACCM). Increases in NO x following a major SSW and/or ES event are in excess of 100% compared to winters when no major SSW or ES event occurred. The increase in NO x is attributed to an increase in the descending branch of the residual circulation (w * ) following the event. The timing of the event strongly affects the amount of NO x that descends to the stratosphere: the earlier the event occurs, the more NO x descends to the stratosphere. We also quantify the amount of NO x produced by EPP descending to the stratosphere in each winter and find that the largest increases in NO x are in years that have a major SSW followed by an ES event early in the season (December or early January). The strength of w * following an event shows a very strong seasonal dependence and explains why the timing of the event affects the transport of NO x .Citation: Holt, L. A., C. E. Randall, E. D. Peck, D. R. Marsh, A. K. Smith, and V. L. Harvey (2013), The influence of major sudden stratospheric warming and elevated stratopause events on the effects of energetic particle precipitation in WACCM,