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Time series observations of molecular iodine (I2), iodine oxides (IO, OIO), bromine oxide (BrO), and the ni- trate radical (NO3) in the mid-latitude coastal marine bound- ary layer (MBL) are reported. Measurements were made us- ing a new long-path DOAS instrument during a summertime campaign at Mace Head on the west coast of Ireland. I2 was detected using the B 3 5(0 + ) X 1 6 + electronic transition be- tween 535 and 575 nm. The I2 mixing ratio was found to vary from below the detection limit ( 5 ppt) up to a night- time maximum of 93 ppt. Along with I2, observations of IO, OIO and NO3 were also made during the night. Surprisingly, IO and OIO were detected at mixing ratios up to 2.5 and 10.8 ppt, respectively. A model is employed to show that the reaction between I2 and NO3 is the likely nighttime source of these radicals. The BrO mixing ratio varied from below the detection limit at night ( 1 ppt) to a maximum of 6 ppt in the first hours after sunrise. A bromine chemistry model is used to simulate the diurnal behaviour of the BrO radical, demon- strating the importance of halogen recycling through sea-salt aerosol. In the same campaign a zenith sky DOAS was em- ployed to determine the column density variation of NO3 as a function of solar zenith angle (SZA) during sunrise, from which vertical profiles of NO 3 through the troposphere were obtained. On several occasions a positive gradient of NO3 was observed over the first 2 km, possibly due to dimethyl sulphide (DMS) removing NO3 at the ocean surface.

atmospheric chemistry and physics

Measurements and modelling of I&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;, IO, OIO, BrO and NO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; in the mid-latitude marine boundary layer