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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
28 Jun 2017
Review status
This discussion paper is a preprint. A revision of this manuscript was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Cyclone-Induced Surface Ozone and HDO Depletion in the Arctic
Xiaoyi Zhao1, Dan Weaver1, Kristof Bognar1, Gloria Manney2,3, Luis Millán4, Xin Yang5, Edwin Eloranta6, Matthias Schneider7, and Kimberly Strong1 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
Abstract. Ground-based, satellite, and reanalysis datasets were used to identify two similar cyclone-induced surface ozone depletion events at 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 airmasses. Ice clouds (vapour and crystals) and aerosols were detected by lidar and radar when the ozone- and HDO-depleted airmasses 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 three days, a shallow surface ozone depletion event (ODE) was observed at Eureka after the precipitation of bromine-enriched particles onto the local snow pack. 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.

Citation: Zhao, X., Weaver, D., Bognar, K., Manney, G., Millán, L., Yang, X., Eloranta, E., Schneider, M., and Strong, K.: Cyclone-Induced Surface Ozone and HDO Depletion in the Arctic, Atmos. Chem. Phys. Discuss.,, in review, 2017.
Xiaoyi Zhao et al.
Interactive discussionStatus: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version      Supplement - Supplement
RC1: 'Cyclone-Induced Surface Ozone and HDO Depletion in the Arctic', Anonymous Referee #1, 31 Jul 2017 Printer-friendly Version 
AC1: 'Response to Referee #1', Xiaoyi Zhao, 06 Oct 2017 Printer-friendly Version Supplement 
RC2: 'Review of the manuscript', Anonymous Referee #2, 01 Sep 2017 Printer-friendly Version 
AC2: 'Response to Referee #2', Xiaoyi Zhao, 06 Oct 2017 Printer-friendly Version Supplement 
Xiaoyi Zhao et al.
Xiaoyi Zhao et al.


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