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Multiple axis differential absorption spectroscopy (MAX-DOAS)measurements of bromine monoxide (BrO) probed the verticalstructure of halogen activation events during March–May 2012 atBarrow, Alaska.  An analysis of the BrO averaging kernels anddegrees of freedom obtained by optimal-estimation-based inversionsfrom raw MAX-DOAS measurements reveals the information is bestrepresented by reducing the retrieved BrO profile to twoquantities: the integrated column from the surface through200 m (VCD<sub>200 m</sub>), and the lower tropospheric verticalcolumn density (LT-VCD), which represents the integrated column ofBrO from the surface through 2 km. The percentage oflower tropospheric BrO in the lowest 200 m was found tobe highly variable ranging from shallow layer events, where BrOis present primarily in the lowest 200 m, to distributed columnevents where BrO is observed at higher altitudes. The highestobserved LT-VCD events occurred when BrO was distributedthroughout the lower troposphere, rather than concentrated near thesurface.  Atmospheric stability in the lowest 200 m influencedthe percentage of LT-VCD that is in the lowest 200 m, withinverted temperature structures having a first-to-third quartile range(Q1–Q3) of VCD<sub>200 m</sub>/LT-VCD from 15–39%, while near-neutral-temperature structures had a Q1–Q3 range of7–13%. Data from this campaign show no clear influence ofwind speed on either lower tropospheric bromine activation (LT-VCD) orthe vertical distribution of BrO, while examination of seasonaltrends and the temperature dependence of the vertical distributionsupported the conclusion that the atmospheric stability affects thevertical distribution of BrO

Dependence of the vertical distribution of bromine monoxide in the lower troposphere on meteorological factors such as wind speed and stability