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The characteristic features and mechanisms of the formation of a deep ozonemini-hole (OMH) in winter 2015/2016 over Siberia were carried out using AIRSand CALIOP satellite data. The depletion in the total column ozone was causedmainly by a strong decrease in ozone mixing ratio in the lower stratosphere,reaching 50% near the pressure level of 70 hPa. The formation of OMH wasclosely related to the dynamic factors including an increase in the tropopauseheight and advection in the troposphere of ozone-depleted subtropical air,which were associated with atmospheric blocking. Also, an important factor ofOMH formation was ozone decrease in the stratosphere due to increased outflowof ozone from the area of the OMH. The contribution of chemical destruction ofstratospheric ozone, due to catalytic reactions with halogen-containingcompounds on the surface of polar stratospheric clouds to the OMH formation,was evaluated.

Ozone mini-hole in winter 2015/2016 over Siberia: Characteristic features and relationship to atmospheric blocking