“…While stratospheric ozone recovery from the slow removal of inorganic chlorine from the stratosphere is expected to occur within this century driven largely by a decrease in ozone depleting substances (Austin et al, ; Chipperfield et al, ; Li et al, ; Oman & Douglass, ; Steinbrecht et al, ; Stone et al, ; World Meteorological Organization, ) due to the Montreal Protocol, recent modeling and observational studies show that additional halogen sources could slow this recovery (Engel et al, ; Hossaini et al, ; Yang et al, ). In particular, convectively transported halogenated very short lived substances of chlorine (Hossaini, Chipperfield, Montzka, et al, ; Hossaini, Chipperfield, Saiz‐Lopez, et al, ; Hossaini et al, ; Laube et al, ; Oram et al, ), bromine (Aschmann et al, ; Dessens et al, ; Hossaini, Chipperfield, Montzka, et al, ; Liang et al, ; Salawitch et al, ; Wales et al, ; Yang et al, ), and iodine (Hossaini, Chipperfield, Saiz‐Lopez, et al, ; Saiz‐Lopez et al, ; Youn et al, ) have been shown to be important sources of stratospheric halogens. Further, both emissions of these halogenated very short lived substance (Ziska et al, ) and their transport to the stratosphere (Falk et al, ; Hossaini et al, ) are expected to increase with climate change resulting in a greater impact on stratospheric ozone (Fernandez et al, ; Tegtmeier et al, ).…”