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The chemistry of the troposphere and specifically the global troposphericozone budget is affected by reactive halogen species such as bromine monoxide(BrO) or chlorine monoxide (ClO). Especially BrO plays an important role inthe processes of ozone destruction, disturbance of NOx andHOx chemistry, oxidation of dimethyl sulfide (DMS), and the deposition of elementarymercury. In the troposphere BrO has been detected in polar regions, at saltlakes, in volcanic plumes, and in the marine boundary layer. For a betterunderstanding of these processes, field measurements as well asreaction chamber studies are performed. In both cases instruments with highspatial resolution and high sensitivity are necessary. A Cavity-Enhanced Differential Optical Absorption Spectroscopy (CE-DOAS) instrument with anopen path measurement cell was designed and applied. For the first time, aCE-DOAS instrument is presented using an UV LED in the 325–365 nmwavelength range. In laboratory studies, BrO as well as HONO, HCHO, O3,and O4 could be reliably determined at detection limits of 20 ppt forBrO, 9.1 ppb for HCHO, 970 ppt for HONO, and 91 ppb for O3, for fiveminutes integration time. The best detection limits wereachieved for BrO (11 ppt), HCHO (5.1 ppb), HONO (490 ppt), and O3(59 ppb) for integration times of 81 minutes or less. Comparison withestablished White system (WS) DOAS and O3 monitor measurements demonstrate thereliability of the instrument

An instrument for measurements of BrO with LED-based Cavity-Enhanced Differential Optical Absorption Spectroscopy