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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2020-263
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-263
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  21 Jul 2020

21 Jul 2020

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This preprint is currently under review for the journal AMT.

Quantitative imaging of volcanic SO2 plumes with Fabry Pérot Interferometer Correlation Spectroscopy

Christopher Fuchs1, Jonas Kuhn1,2, Nicole Bobrowski1,2, and Ulrich Platt1,2 Christopher Fuchs et al.
  • 1Institute of Environmental Physics, University of Heidelberg, Germany
  • 2Max Planck Institute for Chemistry, Mainz, Germany

Abstract. We present first measurements with a novel imaging technique for atmospheric trace gases in the UV spectral range. Imaging Fabry Pérot Interferometer Correlation Spectroscopy (IFPICS), employs a Fabry Pérot Interferometer (FPI) as wavelength selective element. Matching the FPIs distinct, periodic transmission features to the characteristic differential absorption structures of the investigated trace gas allows to measure differential atmospheric column density (CD) distributions of numerous trace gases, e.g. sulphur dioxide (SO2), bromine monoxide (BrO), or nitrogen dioxide (NO2), with high spatial and temporal resolution. The high specificity in the spectral detection of IFPICS minimises cross interferences to other trace gases and aerosol extinction allowing precise determination of gas fluxes. Furthermore, the instrument response can be modelled using absorption cross sections and a solar atlas spectrum from the literature, thereby avoiding additional calibration procedures, e.g. using gas cells. In a field campaign, we recorded the temporal CD evolution of SO2 in the volcanic plume of Mt. Etna with an integration time of 1 s and 400 × 400 pixels spatial resolution. The first IFPICS prototype can reach a detection limit of 2.1 × 1017 molec cm−2 s−1/2, which is comparable to traditional and much less selective volcanic SO2 imaging techniques.

Christopher Fuchs et al.

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Christopher Fuchs et al.

Christopher Fuchs et al.

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Latest update: 27 Oct 2020
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Short summary
We present first measurements of volcanic SO2 emissions with a novel imaging technique for atmospheric trace gases in the UV and visible spectral range. Periodic spectral Fabry-Perot interferometer transmission features are matched to differential absorption cross sections of the investigated trace gas yielding high selectivity and sensitivity. The technique can be extended to measure many other trace gases with high spatio-temporal resolution.
We present first measurements of volcanic SO2 emissions with a novel imaging technique for...
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