AMTD Atmospheric Measurement Techniques Discussions AMTD Atmos. Meas. Tech. Discuss. 1867-8610 Göttingen, Germany 10.5194/amtd-5-3079-2012 A Cavity-Enhanced Differential Optical Absorption Spectroscopy instrument for measurement of BrO, HCHO, HONO and O<sub>3</sub> Hoch D. J. 1 Buxmann J. 1 3 Sihler H. 1 2 Pöhler D. 1 Zetzsch C. 3 Platt U. 1 Institute of Environmental Physics, University of Heidelberg, Germany Max-Planck-Institute for Chemistry, Mainz, Germany Atmospheric Chemistry Research Laboratory, University of Bayreuth, Germany 26 04 2012 5 2 3079 3115 Copyright: © 2012 D. J. Hoch et al. 2012 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://amt.copernicus.org/preprints/5/3079/2012/amtd-5-3079-2012.html The full text article is available as a PDF file from https://amt.copernicus.org/preprints/5/3079/2012/amtd-5-3079-2012.pdf

The chemistry of the troposphere and specifically the global tropospheric ozone budget is affected by reactive halogen compounds like BrO or ClO. Bromine monoxide (BrO) plays an important role in the processes of ozone destruction, disturbance of NO<sub>x</sub> and HO<sub>x</sub> chemistry, oxidation of DMS, and the deposition of elementary mercury. In the troposphere BrO has been detected in polar regions, at salt lakes, in volcanic plumes, and in the marine boundary layer. For a better understanding of these processes instruments with high spatial resolution and high sensitivity are necessary. A Cavity Enhanced Differential Optical Absorption Spectroscopy (CE-DOAS) instrument was designed and applied. For the first time, such an instrument uses an UV-LED in the UV-wavelength range (325–365 nm) to identify BrO. In laboratory studies at the Atmospheric Chemistry Research Laboratory, University of Bayreuth, Germany, BrO, as well as HONO, HCHO, O<sub>3</sub>, and O<sub>4</sub>, could be reliable determined at detection limits (for five minutes integration time) of 20 ppt for BrO, 9.1 ppb for HCHO, 970 ppt for HONO, and 91 ppb for O<sub>3</sub>, respectively. The best detection limits for BrO (11 ppt), HCHO (5.1 ppb), HONO (490 ppt), and O<sub>3</sub> (59 ppb) were achieved for integration times of 81 min or less.

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