Atmos. Chem. Phys. Discuss., 12, 16219-16257, 2012
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Characteristics of tropospheric ozone depletion events in the Arctic spring: analysis of the ARCTAS, ARCPAC, and ARCIONS measurements and satellite BrO observations
J.-H. Koo1, Y. Wang1, T. P. Kurosu2,*, K. Chance2, A. Rozanov3, A. Richter3, S. J. Oltmans4, A. M. Thompson5, J. W. Hair6, M. A. Fenn6, A. J. Weinheimer7, T. B. Ryerson4, S. Solberg8, L. G. Huey1, J. Liao1, J. E. Dibb9, J. A. Neuman4,10, J. B. Nowak4,10, R. B. Pierce11, M. Natarajan6, and J. Al-Saadi6
1School of Earth and Atmospheric Sciences, Georgia Inst. of Technology, Atlanta, GA, USA
2Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA
3Institute of Environmental Physics, University of Bremen, Bremen, Germany
4Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO, USA
5Dept. of Meteorology, Pennsylvania State University, University Park, Pennsylvania, USA
6NASA Langley Research Center, Hampton, VA, USA
7National Center for Atmospheric Research, Boulder, CO, USA
8Norwegian Institute for Air Research (NILU), Kjeller, Norway
9University of New Hampshire, Durham, NH, USA
10Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado Boulder, Boulder, CO, USA
11NOAA National Environmental Satellite, Data, and Information Service, Madison, Wisconsin, USA
*now at: NASA Jet Propulsion Laboratory, Pasadena, CA, USA

Abstract. Arctic ozone depletion events (ODEs) are due to catalytic ozone loss driven by halogen chemistry. The presence of ODEs is affected not only by in situ chemistry but also by transport including advection of ozone-poor air mass and vertical mixing. To better characterize the ODEs, we analyze the combined set of surface, ozonesonde, and aircraft in situ measurements of ozone and bromine compounds during the Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) and the Aerosol, Radiation, and Cloud Processes affecting Arctic Climate (ARCPAC) experiments (April 2008). Tropospheric BrO columns retrieved from satellite measurements and back trajectories calculations are used to investigate the characteristics of observed ODEs. The implications of the analysis results for the validation of the retrieval of tropospheric column BrO are also discussed. Time-lagged correlation analysis between in situ (surface and ozonesonde) measurements of ozone and satellite derived tropospheric BrO indicates that the ODEs are due to either local halogen-driven ozone loss or short-range (~1 day) transport from nearby regions with ozone depletion. The effect of in situ halogen-driven loss is also evident in the diurnal variation of surface ozone concentrations at Alert, Canada. High-BrO regions revealed by satellite measurements tend to be collocated with first-year sea ice, particularly over the Chukchi Sea. Aircraft observations indicate low-ozone air mass transported from these high-BrO regions. Correlation analyses of ozone with potential temperature and time-lagged tropospheric BrO column show that the vertical extent of local ozone loss is surprisingly deep (1–2 km) at Resolute and Churchill, Canada. The unstable boundary layer during ODEs at Churchill could potentially provide a source of free tropospheric BrO through convective transport and explain the significant negative correlation between free tropospheric ozone and tropospheric BrO column at this site.

Citation: Koo, J.-H., Wang, Y., Kurosu, T. P., Chance, K., Rozanov, A., Richter, A., Oltmans, S. J., Thompson, A. M., Hair, J. W., Fenn, M. A., Weinheimer, A. J., Ryerson, T. B., Solberg, S., Huey, L. G., Liao, J., Dibb, J. E., Neuman, J. A., Nowak, J. B., Pierce, R. B., Natarajan, M., and Al-Saadi, J.: Characteristics of tropospheric ozone depletion events in the Arctic spring: analysis of the ARCTAS, ARCPAC, and ARCIONS measurements and satellite BrO observations, Atmos. Chem. Phys. Discuss., 12, 16219-16257, doi:10.5194/acpd-12-16219-2012, 2012.
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