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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amtd-5-3079-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/amtd-5-3079-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Submitted as: research article 26 Apr 2012

Submitted as: research article | 26 Apr 2012

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This preprint was under review for the journal AMT but the revision was not accepted.

A Cavity-Enhanced Differential Optical Absorption Spectroscopy instrument for measurement of BrO, HCHO, HONO and O3

D. J. Hoch1, J. Buxmann1,3, H. Sihler1,2, D. Pöhler1, C. Zetzsch3, and U. Platt1 D. J. Hoch et al.
  • 1Institute of Environmental Physics, University of Heidelberg, Germany
  • 2Max-Planck-Institute for Chemistry, Mainz, Germany
  • 3Atmospheric Chemistry Research Laboratory, University of Bayreuth, Germany

Abstract. 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 NOx and HOx 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, O3, and O4, 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 O3, respectively. The best detection limits for BrO (11 ppt), HCHO (5.1 ppb), HONO (490 ppt), and O3 (59 ppb) were achieved for integration times of 81 min or less.

D. J. Hoch et al.

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D. J. Hoch et al.

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