Fig. 7From: Simulating influences of QBO phases and orographic gravity wave forcing on planetary waves in the middle atmosphereJanuary mean amplitudes of OGW drag components in 10−9 m/s2 (shading) and respective changes in specific EP-fluxes in m3/s2 (arrows) for the easterly QBO phase and for stationary planetary wave modes with zonal wavenumbers 1–5 a and westward travelling NAMs b Back to article page