Mechanisms of ozone enhancement during stratospheric intrusion coupled with convection over upper troposphere equatorial Africa

► Ozone enhancement over upper troposphere equatorial Africa is investigated. ► Planetary waves are responsible for ozone enhancements over equatorial Africa. ► The MTM-SVD method reveals how planetary waves modulate stratospheric PV intrusion. ► Coupling of PV intrusion and deep convection during ozone enhancement is confirmed. ► PV and wind anomalies during a particular cycle of the wave govern ozone variation.