Atmos. Chem. Phys. Discuss., 13, 1435-1453, 2013
© Author(s) 2013. This work is distributed
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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.
Airborne lidar measurements of surface ozone depletion over Arctic sea ice
J. A. Seabrook1, J. A. Whiteway1, L. H. Gray1, R. Staebler2, and A. Herber3
1Centre for Research in Earth and Space Science (CRESS), York University, 4700 Keele Street, Toronto, Ontario, M3J 1P3, Canada
2Environment Canada, 4905 Dufferin Street, Toronto, Ontario, M3H 5T4, Canada
3Alfred Wegener Institute, Bussestrasse 24, 27570 Bremerhaven, Germany

Abstract. A differential absorption lidar (DIAL) for measurement of atmospheric ozone concentration was operated aboard the Polar-5 research aircraft in order to study ozone depletions over Arctic sea ice. The lidar measurements during a flight over the sea ice north of Barrow, Alaska on 3 April 2011 found a surface level depletion of ozone over a range of 300 km. The photochemical destruction of ground level ozone was strongest at the most northern point of the flight, and steadily decreased towards land. All the observed ozone depleted air throughout the flight occurred within 300 m of the sea ice surface. A back-trajectory analysis of the air measured throughout the flight indicated that the ozone depleted air originated from the north over the ice. Air at the surface that was not depleted in ozone had originated from over land to the south. An investigation into the altitude history of the ozone depleted air suggests a strong inverse correlation between measured ozone levels up to 1700 m in altitude, and the amount of time the air directly interacted with the sea ice.

Citation: Seabrook, J. A., Whiteway, J. A., Gray, L. H., Staebler, R., and Herber, A.: Airborne lidar measurements of surface ozone depletion over Arctic sea ice, Atmos. Chem. Phys. Discuss., 13, 1435-1453, doi:10.5194/acpd-13-1435-2013, 2013.
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