Articles | Volume 17, issue 24
Atmos. Chem. Phys., 17, 14955–14974, 2017
Atmos. Chem. Phys., 17, 14955–14974, 2017
Research article
19 Dec 2017
Research article | 19 Dec 2017

Cyclone-induced surface ozone and HDO depletion in the Arctic

Xiaoyi Zhao1,a, Dan Weaver1, Kristof Bognar1, Gloria Manney2,3, Luis Millán4, Xin Yang5, Edwin Eloranta6, Matthias Schneider7, and Kimberly Strong1 Xiaoyi Zhao et al.
  • 1Department of Physics, University of Toronto, Toronto, Ontario, Canada
  • 2NorthWest Research Associates, Socorro, New Mexico, USA
  • 3Department of Physics, New Mexico Institute of Mining and Technology, Socorro, New Mexico, USA
  • 4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
  • 5British Antarctic Survey, Natural Environment Research Council, Cambridge, UK
  • 6Space Science and Engineering Center, University of Wisconsin, Madison, Wisconsin, USA
  • 7Institute of Meteorology and Climate Research (IMK-ASF), Karlsruhe Institute of Technology, Karlsruhe, Germany
  • acurrent address: Measurement and Analysis Research Section, Environment and Climate Change Canada, Toronto, Ontario, Canada

Abstract. Ground-based, satellite, and reanalysis datasets were used to identify two similar cyclone-induced surface ozone depletion events at Eureka, Canada (80.1° N, 86.4° W), in March 2007 and April 2011. These two events were coincident with observations of hydrogen deuterium oxide (HDO) depletion, indicating that condensation and sublimation occurred during the transport of the ozone-depleted air masses. Ice clouds (vapour and crystals) and aerosols were detected by lidar and radar when the ozone- and HDO-depleted air masses 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, indicating this ice cloud layer contained bromine-enriched blowing-snow particles. Over the following 3 days, a shallow surface ozone depletion event (ODE) was observed at Eureka after the precipitation of bromine-enriched particles onto the local snowpack. A chemistry–climate model (UKCA) and a chemical transport model (pTOMCAT) were used to simulate the surface ozone depletion events. Incorporating the latest surface snow salinity data obtained for the Weddell Sea into the models resulted in improved agreement between the modelled and measured BrO concentrations above Eureka. MERRA-2 global reanalysis data and the FLEXPART particle dispersion model were used to study the link between the ozone and HDO depletion. In general, the modelled ozone and BrO showed good agreement with the ground-based observations; however, the modelled BrO and ozone in the near-surface layer are quite sensitive to the snow salinity. HDO depletion observed during these two blowing-snow ODEs was found to be weaker than pure Rayleigh fractionation. This work provides evidence of a blowing-snow sublimation process, which is a key step in producing bromine-enriched sea-salt aerosol.

Short summary
Few scientific questions about surface ozone depletion have been addressed, using a variety of measurements and atmospheric models. The lifetime of reactive bromine is only a few hours in the absence of recycling. Evidence of this recycling over aerosol or blowing-snow/ice particles was found at Eureka. The blowing snow sublimation process is a key step in producing bromine-enriched sea-salt aerosol. Ground-based FTIR isotopologue measurements at Eureka provided evidence of this key step.
Final-revised paper