ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-10-15885-2010 Ozone variability and halogen oxidation within the Arctic and sub-Arctic springtime boundary layer Gilman J. B. 1 2 Burkhart J. F. 3 Lerner B. M. 1 2 Williams E. J. 1 2 Kuster W. C. 1 Goldan P. D. 1 2 Murphy P. C. 1 2 Warneke C. 1 2 Fowler C. 4 Montzka S. A. 1 Miller B. R. 1 2 Miller L. 1 2 Oltmans S. J. 1 Ryerson T. B. 1 Cooper O. R. 1 2 Stohl A. 3 de Gouw J. A. 1 2 Earth System Research Laboratory (ESRL), NOAA, Boulder, CO, USA Cooperative Institute for Research in the Environmental Sciences (CIRES), Univ. of Colorado, Boulder, CO, USA Norwegian Institute for Air Research (NILU), Kjeller, Norway Colorado Center for Astrodynamics Research (CCAR), Univ. of Colorado, Boulder, CO, USA 29 06 2010 10 6 15885 15919 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-discuss.net/10/15885/2010/acpd-10-15885-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/10/15885/2010/acpd-10-15885-2010.pdf

The influence of halogen oxidation on the variabilities of ozone (O<sub>3</sub>) and volatile organic compounds (VOCs) within the Arctic and sub-Arctic atmospheric boundary layer was investigated using field measurements from multiple campaigns conducted in March and April 2008 as part of the POLARCAT project. For the ship-based measurements, a high degree of correlation (<I>r</I>=0.98 for 544 data points collected north of 68° N) was observed between the acetylene to benzene ratio, used as a marker for halogen oxidation, and O<sub>3</sub> signifying the vast influence of bromine oxidation throughout the ice-free regions of the North Atlantic. Concurrent airborne and ground-based measurements in the Alaskan Arctic substantiated this correlation and were used to demonstrate that halogen oxidation influenced O<sub>3</sub> variability throughout the Arctic boundary layer during these springtime studies. Measurements aboard the R/V "Knorr" in the North Atlantic and Arctic Oceans provided a unique view of the transport of O<sub>3</sub>-poor air masses from the Arctic Basin to latitudes as far south as 52° N. FLEXPART, a Lagrangian transport model, was used to quantitatively determine the exposure of air masses encountered by the ship to first-year ice (FYI), multi-year ice (MYI), and total ICE (FYI+MYI). O<sub>3</sub> anti-correlated with the modeled total ICE tracer (<I>r</I>=−0.86) indicating that up to 73% of the O<sub>3</sub> variability measured in the Arctic marine boundary layer could be related to sea ice exposure.

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