Aeolian Remobilisation of Volcanic Ash: Outcomes of a Workshop in the Argentinian Patagonia

• Autores: Jarvis, Paul Antony; Bonadonna, Constanza; Dominguez, Lucía; Forte, Pablo; Frischknecht, Corine; Bran, Donaldo Eduardo; Aguilar, Rigoberto; Beckett, Frances; Elissondo, Manuela; Gillies, John; Kueppers, Ulrich; Merrison, Jonathan; Varley, Nick; Wallace, Kristi L.
• Año de publicación: 2020
• Idioma: inglés
• Tipo de recurso: artículo
• Fuente: Frontiers in Earth Science 8 : art. 575184 (noviembre 2020)
• Materia: Erupciones Volcánicas; Suelo Volcánico; Materiales Volcánicos; Volcanic Eruptions; Volcanic Soils; Volcanic Materials; Ceniza Volcánica; Cordón Caulle; Remobilización Eólica; Región Patagónica
• Institución: Instituto Nacional de Tecnología Agropecuaria

During explosive volcanic eruptions, large quantities of tephra can be dispersed and deposited over wide areas. Following deposition, subsequent aeolian remobilisation of ash can potentially exacerbate primary impacts on timescales of months to millennia. Recent ash remobilisation events (e.g., following eruptions of Cordón Caulle 2011; Chile, and Eyjafjallajökull 2010, Iceland) have highlighted this to be a recurring phenomenon with consequences for human health, economic sectors, and critical infrastructure. Consequently, scientists from observatories and Volcanic Ash Advisory Centers (VAACs), as well as researchers from fields including volcanology, aeolian processes and soil sciences, convened at the San Carlos de Bariloche headquarters of the Argentinian National Institute of Agricultural Technology to discuss the “state of the art” for field studies of remobilised deposits as well as monitoring, modeling and understanding ash remobilisation. In this article, we identify practices for field characterisation of deposits and active processes, including mapping, particle characterisation and sediment traps. Furthermore, since forecast models currently rely on poorly-constrained dust emission schemes, we call for laboratory and field measurements to better parameterise the flux of volcanic ash as a function of friction velocity.While source area location and extent are currently the primary inputs for dispersion models, once emission schemes become more sophisticated and better constrained, other parameters will also become important (e.g., source material volume and properties, effective precipitation, type and distribution of vegetation cover, friction velocity). Thus, aeolian ash remobilisation hazard and associated impact assessment require systematic monitoring, including the development of a regularly-updated spatial database of resuspension source areas.
Estación Experimental Agropecuaria Bariloche
Fil: Jarvis, Paul Antony. University of Geneva. Department of Earth Sciences; Suiza
Fil: Bonadonna, Constanza. University of Geneva. Department of Earth Sciences; Suiza
Fil: Dominguez, Lucía. University of Geneva. Department of Earth Sciences; Suiza
Fil: Forte, Pablo. Universidad Naciona de Buenos Aires. Instituto de Estudios Andinos; Argentina
Fil: Frischknecht, Corine. University of Geneva. Department of Earth Sciences; Suiza
Fil: Bran, Donaldo Eduardo. Instituto Nacional de Tecnologia Agropecuaria (INTA). Estación Experimental Agropecuaria Bariloche; Argentina
Fil: Aguilar, Rigoberto. Instituto Geológico, Minero y Metalúrgico. Observatorio Vulcanologico; Perú
Fil: Beckett, Frances. Exeter. Met Office; Reino Unido
Fil: Elissondo, Manuela. Servicio Geológico Minero Argentino; Argentina
Fil: Gillies, John. Desert Research Institute; Estados Unidos
Fil: Kueppers, Ulrich. Ludwig-Maximilians- Universität München. Earth and Environmental Sciences; Alemania
Fil: Merrison, Jonathan. Aarhus University. Department of Physics and Astronomy; Dinamarca
Fil: Varley, Nick. Universidad de Colima. Facultad de Ciencias,; México
Fil: Wallace, Kristi L. Volcano Science Center. Alaska Volcano Observatory. U.S. Geological Survey; Estados Unidos