High-spectral-resolution Fabry-Pérot interferometers overcome fundamental limitations of present volcanic gas remote sensing techniques
Remote sensing (RS) of volcanic gases has become a central tool for studying volcanic activity. For instance, ultraviolet (UV) skylight spectroscopy with grating spectrographs (GS) enables SO2 (and, under favourable conditions, BrO) quantification in volcanic plumes from autonomous platforms at safe...
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| Hauptverfasser: | , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
01 March 2023
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| In: |
Frontiers in Science
Year: 2023, Jahrgang: 11, Pages: 1-18 |
| ISSN: | 2166-6113 |
| DOI: | 10.3389/feart.2023.1039093 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: https://www.frontiersin.org/articles/10.3389/feart.2023.1039093 Verlag, kostenfrei, Volltext: https://doi.org/10.3389/feart.2023.1039093 
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| Verfasserangaben: | Jonas Kuhn, Nicole Bobrowski, Guillaume Boudoire, Sergio Calabrese, Giovanni Giuffrida, Marco Liuzzo, Katcho Karume, Dario Tedesco, Thomas Wagner and Ulrich Platt |
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| 245 | 1 | 0 | |a High-spectral-resolution Fabry-Pérot interferometers overcome fundamental limitations of present volcanic gas remote sensing techniques |c Jonas Kuhn, Nicole Bobrowski, Guillaume Boudoire, Sergio Calabrese, Giovanni Giuffrida, Marco Liuzzo, Katcho Karume, Dario Tedesco, Thomas Wagner and Ulrich Platt |
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| 520 | |a Remote sensing (RS) of volcanic gases has become a central tool for studying volcanic activity. For instance, ultraviolet (UV) skylight spectroscopy with grating spectrographs (GS) enables SO2 (and, under favourable conditions, BrO) quantification in volcanic plumes from autonomous platforms at safe distances. These measurements can serve volcanic monitoring and they cover all stages of volcanic activity in long measurement time series, which substantially contributes to the refinement of theories on volcanic degassing. Infrared (IR) remote sensing techniques are able to measure further volcanic gases (e.g., HF, HCl, CO2, CO). However, the employed Fourier transform spectrometers (FTSs) are intrinsically intricate and, due to limited resolving power or light throughput, mostly rely on either lamps, direct sun, or hot lava as light source, usually limiting measurements to individual field campaigns. We show that many limitations of grating spectrographs and Fourier transform spectrometer measurements can be overcome by Fabry-Perot interferometer (FPI) based spectrograph implementations. Compared to grating spectrographs and Fourier transform spectrometers, Fabry-Perot interferometer spectrographs reach a 1-3 orders of magnitude higher spectral resolution and superior light throughput with compact and stable set-ups. This leads to 1) enhanced sensitivity and selectivity of the spectral trace gas detection, 2) enables the measurement of so far undetected volcanic plume constituents [e.g., hydroxyl (OH) or sulfanyl (SH)], and 3) extends the range of gases that can be measured continuously using the sky as light source. Here, we present measurements with a shoe-box-size Fabry-Perot interferometer spectrograph (resolving power of ca. 150000), performed in the crater of Nyiragongo volcano. By analysing the light of a ultraviolet light emitting diode that is sent through the hot gas emission of an active lava flow, we reach an OH detection limit of about 20 ppb, which is orders of magnitude lower than the mixing ratios predicted by high-temperature chemical models. Furthermore, we introduce example calculations that demonstrate the feasibility of skylight-based remote sensing of HF and HCl in the short-wave infrared with Fabry-Perot interferometer spectrographs, which opens the path to continuous monitoring and data acquisition during all stages of volcanic activity. This is only one among many further potential applications of remote sensing of volcanic gases with high spectral resolution. | ||
| 700 | 1 | |a Bobrowski, Nicole |e VerfasserIn |0 (DE-588)1025103068 |0 (DE-627)721132693 |0 (DE-576)185885179 |4 aut | |
| 700 | 1 | |a Boudoire, Guillaume |e VerfasserIn |4 aut | |
| 700 | 1 | |a Calabrese, Sergio |e VerfasserIn |4 aut | |
| 700 | 1 | |a Giuffrida, Giovanni |e VerfasserIn |4 aut | |
| 700 | 1 | |a Liuzzo, Marco |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Platt, Ulrich |d 1949- |e VerfasserIn |0 (DE-588)13766740X |0 (DE-627)594831385 |0 (DE-576)304832634 |4 aut | |
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