Insights into volcanic hazards and plume chemistry from multi-parameter observations: the eruptions of Fimmvörðuháls and Eyjafjallajökull (2010) and Holuhraun (2014-2015).

• Main Authors: Donovan, Amy, Pfeffer, Melissa, Barnie, Talfan, Sawyer, Georgina, Roberts, Tjarda, Bergsson, Baldur, Ilyinskaya, Evgenia, Peters, Nial, Buisman, Iris, Snorrason, Arní, Tsanev, Vitchko, Oppenheimer, Clive
• Format: Article in Journal/Newspaper
• Language: English
• Published: Springer Science and Business Media LLC 2023
• Subjects: Iceland; Multi-parameter monitoring; Volcanic gas hazard; Volcanic gas monitoring; Volcanic plumes; Holuhraun; Fimmvörðuháls; Eyjafjallajökull
• Online Access: https://www.repository.cam.ac.uk/handle/1810/357191

Funder: Natural Environment Research Council; doi: http://dx.doi.org/10.13039/501100000270 Funder: European Research Council; doi: http://dx.doi.org/10.13039/501100000781 Funder: Leverhulme Trust; doi: http://dx.doi.org/10.13039/501100000275 UNLABELLED: The eruptions of Eyjafjallajökull volcano in 2010 (including its initial effusive phase at Fimmvörðuháls and its later explosive phase from the central volcano) and Bárðarbunga volcano in 2014-2015 (at Holuhraun) were widely reported. Here, we report on complementary, interdisciplinary observations made of the eruptive gases and lavas that shed light on the processes and atmospheric impacts of the eruptions, and afford an intercomparison of contrasting eruptive styles and hazards. We find that (i) consistent with other authors, there are substantial differences in the gas composition between the eruptions; namely that the deeper stored Eyjafjallajökull magmas led to greater enrichment in Cl relative to S; (ii) lava field SO2 degassing was measured to be 5-20% of the total emissions during Holuhraun, and the lava emissions were enriched in Cl at both fissure eruptions-particularly Fimmvörðuháls; and (iii) BrO is produced in Icelandic plumes in spite of the low UV levels. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s11069-023-06114-7.