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dc.contributor.author
Durant, Adam J.
dc.contributor.author
Villarosa, Gustavo
dc.contributor.author
Rose, William I.
dc.contributor.author
Delmelle, Pierre
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Prata, Alfred J.
dc.contributor.author
Viramonte, Jose German
dc.date.available
2019-05-14T15:15:46Z
dc.date.issued
2012-03-01
dc.identifier.citation
Durant, Adam J.; Villarosa, Gustavo; Rose, William I.; Delmelle, Pierre; Prata, Alfred J.; et al.; Long-range volcanic ash transport and fallout during the 2008 eruption of Chaitén volcano, Chile; Pergamon-Elsevier Science Ltd; Physics and Chemistry of the Earth; 45-46; 1-3-2012; 50-64
dc.identifier.issn
1474-7065
dc.identifier.uri
http://hdl.handle.net/11336/76260
dc.description.abstract
The May 2008 eruption of Chaitén volcano, Chile, provided a rare opportunity to measure the long-range transport of volcanic emissions and characteristics of a widely-dispersed terrestrial ash deposit. Airborne ash mass, quantified using thermal infrared satellite remote sensing, ranged between 0.2 and 0.4. Tg during the period 3-7 May 2008. A high level of spatiotemporal correspondence was observed between cloud trajectories and changes in surface reflectivity, which was inferred to indicate ash deposition. The evolution of the deposit was mapped for the first time using satellite-based observations of surface reflectivity.The distal (>80. km) ash deposit was poorly sorted and fine grained, and mean particle size varied very little beyond a distance >300. km. There were three particle size subpopulations in fallout at distances >300. km which mirror those identified in fallout from the 18 May 1980 eruption of Mount St. Helens, known to have a high propensity for aggregation. Discrete temporal sampling and characterisation of fallout demonstrated contributions from specific eruptive phases. Samples collected at the time of deposition were compared to bulk samples collected months after deposition and provided some evidence for winnowing.Experimentally-derived ash leachates had near-neutral pH values and charge balance which indicates minimal quantities of adsorbed acids. X-ray Photoelectron Spectroscopy (XPS) analyses revealed surface enrichments in Ca, Na and Fe and the presence of coatings of mixed Ca-, Na- and Fe-rich salts on ash particles prior to deposition. Low S:Cl ratios in leachates indicate that the eruption had a low S content, and high Cl:F ratios imply gas-ash interaction within a Cl-rich environment. We estimate that ash fallout had potential to scavenge ~42% of total S released into the atmosphere prior to deposition. XPS analyses also revealed ash particle surfaces were strongly enriched in Fe (in contrast to the results from bulk leachate analyses), which suggests that Chaitén ash fallout over oceans had potential to influence productivity in high-nutrient, low-chlorophyl regions of the oceans. Therefore ash particle surface geochemical analysis should be applied to quantify Fe-modulated biologically-forced CO 2 draw-down potential of volcanic ash fallout over oceans.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Pergamon-Elsevier Science Ltd
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Aggregation
dc.subject
Chaitén
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Fallout
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Ocean Fertilisation
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Satellite Remote Sensing
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Volcanic Ash
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Meteorología y Ciencias Atmosféricas
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Long-range volcanic ash transport and fallout during the 2008 eruption of Chaitén volcano, Chile
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2019-04-23T15:02:44Z
dc.journal.volume
45-46
dc.journal.pagination
50-64
dc.journal.pais
Estados Unidos
dc.description.fil
Fil: Durant, Adam J.. Norwegian Institute for Air Research; Noruega. Michigan Technological University; Estados Unidos. University of Cambridge; Estados Unidos
dc.description.fil
Fil: Villarosa, Gustavo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
dc.description.fil
Fil: Rose, William I.. Michigan Technological University; Estados Unidos
dc.description.fil
Fil: Delmelle, Pierre. University of York; Reino Unido
dc.description.fil
Fil: Prata, Alfred J.. Norwegian Institute for Air Research; Noruega
dc.description.fil
Fil: Viramonte, Jose German. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Salta. Instituto de Investigaciones en Energía no Convencional. Universidad Nacional de Salta. Facultad de Ciencias Exactas. Departamento de Física. Instituto de Investigaciones en Energía no Convencional; Argentina
dc.journal.title
Physics and Chemistry of the Earth
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S1474706511002609
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.pce.2011.09.004
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