Atmospheric Measurement Techniques
Atmospheric Measurement Techniques
AMT
Articles | Volume 19, issue 18
Articles | Volume 19, issue 18
https://doi.org/10.5194/amt-19-6145-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-19-6145-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 19, issue 18
Research article
 | 
25 Sep 2026
Research article |  | 25 Sep 2026

Feasibility of measuring volcanic gas composition using sky-scattered sunlight and FTIR spectroscopy

Tobias D. Schmitt, Moritz Sindram, Benedikt A. Löw, Lukas Weis, Ralph Kleinschek, Nicole Bobrowski, and André Butz

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Short summary
Monitoring systems for volcanic gases use ultraviolet and visible light, since the sky is brightest there.
We analyzed whether the concept extends to the near-infrared, where CO2 and halogen gases such as hydrogen chloride also absorb.
We find this realistic for the halogen gases at strongly emitting volcanoes, but very difficult for CO2.
We propose pairing it with the ultraviolet instruments already in use.
This could improve our understanding of volcanic processes and eruption risks.
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