Ground-based and satellite datasets were used to identify two similar cyclone-induced surface ozone depletion events in Eureka Canada (80.1o N, 86.4o W), in March 2007 and April 2011. These two events were coincident with observations of HDO depletion, indicating that condensation and sublimation occurred during the transport of the ozone-depleted airmass. Lidar and radar detected ice cloud (vapour and ice crystals) and aerosol when the ozone- and HDO-depleted airmass arrived over Eureka. For the 2007 event, an ice cloud layer was coincident with an aloft ozone depletion layer at 870 m altitude on 2-3 March. In the following three days, a shallow surface ODE was observed at Eureka after the precipitation of bromine-enriched particles onto the local snow pack. A chemistry climate model and a chemical transport model were used to simulate the surface ozone depletion events. By implementing the latest surface snow salinity data obtained at the Weddell Sea, the modelled bromine concentration above Eureka improved to agree with measurements. MERRA-2 global reanalysis model data and the FLEXPART particle dispersion model were used to study the link between the ozone and HDO depletion.