First In Situ Observations of Gaseous Volcanic Plume Electrification

Keri Nicoll*, Martin Airey, Corrado Cimarelli, Alec Bennett, Giles Harrison, Damien Gaudin, Karen Aplin, Kuang Liang Koh, Marco Knuever, Graeme Marlton

*Corresponding author for this work

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Abstract

Volcanic plumes become electrically charged, often producing spectacular displays of lightning. Previous research has focused on understanding volcanic lightning, primarily the large electric fields produced by charging of ash particles. Here we report on the previously overlooked phenomenon of volcanic plume electrification in the absence of detectable ash. We present the first in situ vertical profile measurements of charge, thermodynamic, and microphysical properties inside predominantly gaseous plumes directly above an erupting volcano. Our measurements demonstrate that substantial charge (at least ±8,000 pC/m 3 ) is present in gaseous volcanic clouds without detectable ash. We suggest that plume charging may be enhanced by the emission of radon gas from the volcano, which causes ionization. This presents a hitherto unrecognized, but likely to be common, mechanism for charge generation in volcanic plumes, which is expected to modulate plume characteristics and lifetime. This process is currently neglected in recognized mechanisms of volcanic plume electrification.

Original languageEnglish
Pages (from-to)3532-3539
Number of pages8
JournalGeophysical Research Letters
Volume46
Issue number6
DOIs
Publication statusPublished - 28 Mar 2019

Keywords

  • volcanic lightning
  • plume electrification
  • plume charging
  • radon
  • balloon instrumentation

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    Nicoll, K., Airey, M., Cimarelli, C., Bennett, A., Harrison, G., Gaudin, D., Aplin, K., Koh, K. L., Knuever, M., & Marlton, G. (2019). First In Situ Observations of Gaseous Volcanic Plume Electrification. Geophysical Research Letters, 46(6), 3532-3539. https://doi.org/10.1029/2019GL082211