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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 3 | Copyright
Atmos. Chem. Phys., 18, 1671-1683, 2018
https://doi.org/10.5194/acp-18-1671-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 06 Feb 2018

Research article | 06 Feb 2018

Detection of O4 absorption around 328 and 419 nm in measured atmospheric absorption spectra

Johannes Lampel1,a, Johannes Zielcke2,b, Stefan Schmitt2, Denis Pöhler2, Udo Frieß2, Ulrich Platt2, and Thomas Wagner1 Johannes Lampel et al.
  • 1Max Planck Institute for Chemistry, Mainz, Germany
  • 2Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany
  • anow at: Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany
  • bnow at: Faculty of Medicine, University of Heidelberg, Heidelberg, Germany

Abstract. Retrieving the column of an absorbing trace gas from spectral data requires that all absorbers in the corresponding wavelength range are sufficiently well known. This is especially important for the retrieval of weak absorbers, whose absorptions are often in the 10−4 range.

Previous publications on the absorptions of the oxygen dimer O2–O2 (or short: O4) list absorption peaks at 328 and 419nm, for which no spectrally resolved literature cross sections are available. As these absorptions potentially influence the spectral retrieval of various trace gases, such as HCHO, BrO, OClO and IO, their shape and magnitude need to be quantified.

We assume that the shape of the absorption peaks at 328 and 419nm can be approximated by their respective neighbouring absorption peaks. Using this approach we obtain estimates for the wavelength of the absorption and its magnitude. Using long-path differential optical absorption spectroscopy (LP-DOAS) observations and multi-axis DOAS (MAX-DOAS) observations, we estimate the peak absorption cross sections of O4 to be (1.96  ±  0.20) × 10−47cm5molec−2 and determine the wavelength of its maximum at 328.59  ±  0.15nm.

For the absorption at 419.13  ±  0.42nm a peak O4 cross-section value is determined to be (5.0  ±  3.5) × 10−48cm5molec−2.

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Previous publications on the absorptions of the oxygen dimer O2–O2 (or short: O4) list absorption peaks at 328 nm and 419 nm, for which no spectrally resolved literature cross sections are available. As these absorptions potentially influence the spectral retrieval of various other trace gases, their shape and magnitude need to be quantified. We approximate the absorption peaks at 328 nm and 419 nm by their respective neighboring absorption peaks to estimate their magnitude and peak wavelength.
Previous publications on the absorptions of the oxygen dimer O2–O2 (or short: O4) list...
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