Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 2 2009 10.5194/acpd-9-8561-2009 http://www.atmos-chem-phys-discuss.net/9/8561/2009/ http://www.atmos-chem-phys-discuss.net/9/8561/2009/acpd-9-8561-2009.html http://www.atmos-chem-phys-discuss.net/9/8561/2009/acpd-9-8561-2009.pdf 8561 8586 2009-03-31 Ozone in the Boundary Layer air over the Arctic Ocean – measurements during the TARA expedition J. W. Bottenheim jan.bottenheim@ec.gc.ca S. Netcheva S. Morin S. V. Nghiem Environment Canada, 4905 Dufferin Street, Toronto, ON M3H 5T4, Canada LGGE, CNRS-UJF Grenoble, St Martin d'Hères, 38400, France Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA A full year of measurements of surface ozone over the Arctic Ocean far removed from land is presented (81° N – 88° N latitude). The data were obtained during the drift of the French schooner TARA between September 2006 and January 2008, while frozen in the Arctic Ocean. The data confirm that long periods of virtually total absence of ozone occur in the spring (mid March to mid June) after Polar sunrise. At other times of the year ozone concentrations are comparable to other oceanic observations with winter mole fractions of ca. 30–40 nmol mol^−1 and summer minima of ca. 20 nmol mol^−1. Contrary to earlier observations from ozone sonde data obtained at Arctic coastal observatories, the ambient temperature was well above −20°C during most ODEs (ozone depletion episodes). Backwards trajectory calculations suggest that during these ODEs the air had previously been in contact with the frozen ocean surface for several days and originated largely from the Siberian coast where several large open flaw leads developed in the spring of 2007. 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