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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 (equivalent to pmol mol<sup>−1</sup>; 1 s average)  were observed at day-time low tide, well in  excess of previous observed spatially-averaged maxima. A strong  anti-correlation of IO mixing ratios 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 peak IO 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 direct  empirical evidence of the presence of inhomogeneities in the IO mixing  ratio near the intertidal region

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