the different approaches developed to overcome this problem, the Match approach developed at AWI ( Rex et al., 1999 ) is the most straightforward and reliable solution. In the Match approach, an air mass [...] below the formation temperature of polar stratospheric clouds is linear to a good approximation ( Rex et al., 2004 ; 2006 ; Tilmes et al., 2006 ; Pommereau et al., 2018 ). The Match campaigns (see preceding [...] seasons in the past for this study. As expected lower temperatures lead to more ozone losses. Moreover, Rex et al. ( 2004 , 2006 ) showed that there is a tendency for cold stratospheric Arctic winters to get