Fig. 3From: Simulating influences of QBO phases and orographic gravity wave forcing on planetary waves in the middle atmosphereJanuary mean amplitudes of geopotential height variations (gpm) produced by stationary planetary wave modes with zonal wavenumbers 1, 2, 3, and 4 (panels from the top to the bottom, respectively) for the easterly QBO phase without OGW effects a. The amplitudes differ due to involving OGW effects in the easterly QBO phase b and due to change in QBO phase from easterly to westerly without OGW c. Solid contours in panels b and c correspond to zero differencesBack to article page