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Dynamics of Outgassing and Plume Transport Revealed by Proximal Unmanned Aerial System (UAS) Measurements at Volcán Villarrica, Chile

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)730-750
Number of pages21
JournalGeochemistry, Geophysics, Geosystems
Volume20
Issue number2
Early online date5 Feb 2019
DOIs
DateAccepted/In press - 26 Dec 2018
DateE-pub ahead of print - 5 Feb 2019
DatePublished (current) - Feb 2019

Abstract

Volcanic gas emissions are intimately linked to the dynamics of magma ascent and outgassing, and, on geological timescales, constitute an important source of volatiles to the Earth's atmosphere. Measurements of gas composition and flux are therefore critical to both volcano monitoring and to determining the contribution of volcanoes to global geochemical cycles. However, significant gaps remain in our global inventories of volcanic emissions, (particularly for CO2, which requires proximal sampling of a concentrated plume) for those volcanoes where the near‐vent region is hazardous or inaccessible. Unmanned Aerial Systems (UAS) provide a robust and effective solution to proximal sampling of dense volcanic plumes in extreme volcanic environments. Here, we present gas compositional data acquired using a gas sensor payload aboard a UAS flown at Volcán Villarrica, Chile. We compare UAS‐derived gas timeseries to simultaneous crater rim multi‐GAS data and UV camera imagery to investigate early plume evolution. SO2 concentrations measured in the young proximal plume exhibit periodic variations that are well‐correlated with the concentrations of other species. By combining molar gas ratios (CO2/SO2 = 1.48–1.68, H2O/SO2 = 67–75 and H2O/CO2 = 45–51) with the SO2 flux (142 ± 17 t/day) from UV camera images, we derive CO2 and H2O fluxes of ~150 t/day and ~2850 t/day, respectively. We observe good agreement between time‐averaged molar gas ratios obtained from simultaneous UAS‐ and ground‐based multi‐GAS acquisitions. However, the UAS measurements made in the young, less diluted plume reveal additional short‐term periodic structure that reflects active degassing through discrete, audible gas exhalations.

    Research areas

  • Unmanned Aerial System, drone, Villarrica, volcanic emissions, degassing

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  • Full-text PDF (accepted author manuscript)

    Rights statement: This is the accepted author manuscript (AAM). The final published version (version of record) is available online via American Geophysical Union at https://doi.org/10.1029/2018GC007692 . Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 2 MB, PDF document

  • Full-text PDF (final published version)

    Rights statement: This is the final published version of the article (version of record). It first appeared online via AGU at https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2018GC007692 . Please refer to any applicable terms of use of the publisher.

    Final published version, 5 MB, PDF document

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