References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-9-4545-2009

Ozone in the boundary layer air over the Arctic Ocean: measurements during the TARA transpolar drift 2006–2008

Bottenheim

J. W.

¹ Netcheva

¹ Morin

² ⁴ Nghiem

S. V.

Environment Canada, 4905 Dufferin Street, Toronto, ON M3H 5T4, Canada

LGGE, CNRS – UJF Grenoble, 38400 St. Martin d'Hères, France

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA

now at: CEN, CNRM/GAME, Météo-France – CNRS, 38400 St. Martin d'Hères, France

15 07 2009

9 14 4545 4557

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/9/4545/2009/acp-9-4545-2009.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/9/4545/2009/acp-9-4545-2009.pdf

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 and polynyas developed in the spring of 2007.

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