Fig. 1From: Simulating influences of QBO phases and orographic gravity wave forcing on planetary waves in the middle atmosphereAverage for January zonal mean eastward velocity (m/s) for the easterly QBO phase without OGW effects a and velocity differences 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 correspond to zero valuesBack to article page