References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-11-4533-2011

Iodine monoxide at a clean marine coastal site: observations of high frequency variations and inhomogeneous distributions

Commane

¹ ⁵ Seitz

² Bale

C. S. E.

¹ Bloss

W. J.

³ Buxmann

² Ingham

¹ ⁴ Platt

² Pöhler

² Heard

D. E.

¹ ⁴

School of Chemistry, University of Leeds, LS2 9JT, UK

Institute of Environmental Physics, University of Heidelberg, Germany

School of Geography, Earth and Environmental Sciences, University of Birmingham, B15 2TT, UK

National Centre for Atmospheric Science, University of Leeds, Leeds, LS2 9JT, UK

now at: School of Engineering and Applied Sciences, Harvard University, MA, USA

08 02 2011

11 2 4533 4568

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.

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The first in situ point observations of iodine monoxide (IO) at a clean marine site were made using a laser-induced fluorescence instrument deployed at Mace Head, Ireland in August 2007. IO mixing ratios of up to 49.8 pptv (1 s) were observed at day-time low tide, well in excess of previous observed spatially-averaged maxima. A strong anti-correlation of IO with tide height was evident and the high time resolution of the observations showed IO peaked in the hour after low tide. The temporal delay in IO peak compared to low tide has not been observed previously but coincides with the time of peak aerosol number previously observed at Mace Head. <br><br> A long path-differential optical absorption spectroscopy instrument (with a 2 × 6.8 km folded path across Roundstone Bay) was also based at the site for 3 days during the point measurement observation period. Both instruments show similar temporal trends but the point measurements of IO are a factor of ~6–10 times greater than the spatially averaged IO mixing ratios, providing empirical evidence of the presence of inhomogeneities in the IO mixing ratio near the intertidal region.

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