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| Titel |
Ground-based remote sensing of volcanic CO2 and correlated SO2, HF, HCl, and BrO, in safe-distance from the crater |
| VerfasserIn |
André Butz, Anna Solvejg Dinger, Nicole Bobrowski, Julian Kostinek, Lukas Fieber, Constanze Fischerkeller, Giovanni Bruno Giuffrida, Frank Hase, Friedrich Klappenbach, Jonas Kuhn, Peter Lübcke, Lukas Tirpitz, Qiansi Tu |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250142967
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| Publikation (Nr.) |
 EGU/EGU2017-6652.pdf |
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| Zusammenfassung |
| Remote sensing of CO2 enhancements in volcanic plumes can be a tool to estimate
volcanic CO2 emissions and thereby, to gain insight into the geological carbon
cycle and into volcano interior processes. However, remote sensing of the volcanic
CO2 is challenged by the large atmospheric background concentrations masking
the minute volcanic signal. Here, we report on a demonstrator study conducted in
September 2015 at Mt. Etna on Sicily, where we deployed an EM27/SUN Fourier
Transform Spectrometer together with a UV spectrometer on a mobile remote sensing
platform. The spectrometers were operated in direct-sun viewing geometry collecting
cross-sectional scans of solar absorption spectra through the volcanic plume by
operating the platform in stop-and-go patterns in 5 to 10 kilometers distance from
the crater region. We successfully detected correlated intra-plume enhancements
of CO2 and volcanic SO2, HF, HCl, and BrO. The path-integrated volcanic CO2
enhancements amounted to about 0.5 ppm (on top of the ∼400 ppm background). Key to
successful detection of volcanic CO2 was A) the simultaneous observation of the O2
total column which allowed for correcting changes in the CO2 column caused by
changes in observer altitude and B) the simultaneous measurement of volcanic
species co-emitted with CO2 which allowed for discriminating intra-plume and
extra-plume observations. The latter were used for subtracting the atmospheric
CO2 background. The field study suggests that our remote sensing observatory is a
candidate technique for volcano monitoring in safe distance from the crater region. |
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