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Modelling the Effect of Electrification on Volcanic Ash Aggregation

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Modelling the Effect of Electrification on Volcanic Ash Aggregation. / Pollastri, Stefano; Rossi, Eduardo; Bonadonna, Costanza; Merrison, Jonathan P.

I: Frontiers in Earth Science, Bind 8, 574106, 02.2021.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Harvard

Pollastri, S, Rossi, E, Bonadonna, C & Merrison, JP 2021, 'Modelling the Effect of Electrification on Volcanic Ash Aggregation', Frontiers in Earth Science, bind 8, 574106. https://doi.org/10.3389/feart.2020.574106

APA

Pollastri, S., Rossi, E., Bonadonna, C., & Merrison, J. P. (2021). Modelling the Effect of Electrification on Volcanic Ash Aggregation. Frontiers in Earth Science, 8, [574106]. https://doi.org/10.3389/feart.2020.574106

CBE

Pollastri S, Rossi E, Bonadonna C, Merrison JP. 2021. Modelling the Effect of Electrification on Volcanic Ash Aggregation. Frontiers in Earth Science. 8:Article 574106. https://doi.org/10.3389/feart.2020.574106

MLA

Vancouver

Pollastri S, Rossi E, Bonadonna C, Merrison JP. Modelling the Effect of Electrification on Volcanic Ash Aggregation. Frontiers in Earth Science. 2021 feb;8. 574106. https://doi.org/10.3389/feart.2020.574106

Author

Pollastri, Stefano ; Rossi, Eduardo ; Bonadonna, Costanza ; Merrison, Jonathan P. / Modelling the Effect of Electrification on Volcanic Ash Aggregation. I: Frontiers in Earth Science. 2021 ; Bind 8.

Bibtex

@article{2d79f8ff090949d5aca7093890a3829b,
title = "Modelling the Effect of Electrification on Volcanic Ash Aggregation",
abstract = "The fine ash released into the atmosphere (particles <63 μm) during explosive volcanic eruptions represents a significant threat for both the ecosystem and many sectors of society. In order to mitigate the associated impact, ash dispersal models need to accurately estimate ash concentration through time and space. Since most fine ash sediments in the form of aggregates, ash dispersal models require a quantitative description of ash aggregation. The physical and chemical processes involved in the collision and sticking of volcanic ash have been extensively studied in the last few decades. Among the different factors affecting volcanic particle aggregation (e.g., turbulence, particle-particle adhesion, presence of liquid and solid water), the charge carried by volcanic particles has been found to play a crucial role. However, Coulomb interactions are not yet taken into account in existing models. In order to fill this gap, we propose a strategy to take charge into account. In particular, we introduce a quantitative model for aggregation of oppositely charged micron—to millimetre-sized objects settling in still air. Our results show that the presence of charge considerably enhances the collision efficiency when one of the colliding objects is very small (<20 µm), and that the sticking efficiency is not affected by particle charge if colliding objects are either small enough (<20 µm) or large enough (>200 µm). Besides providing a theoretical framework to quantify the effect of charge, our findings demonstrate that aggregation models that do not account for electrification significantly underestimate the amount of fine ash that sediments in the form of aggregates, leading to an overestimation of the residence time of fine ash in the atmosphere after explosive volcanic eruptions.",
keywords = "collision efficiency, collision map, electrification, sticking efficiency, volcanic particle aggregation",
author = "Stefano Pollastri and Eduardo Rossi and Costanza Bonadonna and Merrison, {Jonathan P.}",
note = "Publisher Copyright: {\textcopyright} Copyright {\textcopyright} 2021 Pollastri, Rossi, Bonadonna and Merrison.",
year = "2021",
month = feb,
doi = "10.3389/feart.2020.574106",
language = "English",
volume = "8",
journal = "Frontiers of Earth Science",
issn = "2095-0195",
publisher = "Gaodeng Jiaoyu Chubanshe",

}

RIS

TY - JOUR

T1 - Modelling the Effect of Electrification on Volcanic Ash Aggregation

AU - Pollastri, Stefano

AU - Rossi, Eduardo

AU - Bonadonna, Costanza

AU - Merrison, Jonathan P.

N1 - Publisher Copyright: © Copyright © 2021 Pollastri, Rossi, Bonadonna and Merrison.

PY - 2021/2

Y1 - 2021/2

N2 - The fine ash released into the atmosphere (particles <63 μm) during explosive volcanic eruptions represents a significant threat for both the ecosystem and many sectors of society. In order to mitigate the associated impact, ash dispersal models need to accurately estimate ash concentration through time and space. Since most fine ash sediments in the form of aggregates, ash dispersal models require a quantitative description of ash aggregation. The physical and chemical processes involved in the collision and sticking of volcanic ash have been extensively studied in the last few decades. Among the different factors affecting volcanic particle aggregation (e.g., turbulence, particle-particle adhesion, presence of liquid and solid water), the charge carried by volcanic particles has been found to play a crucial role. However, Coulomb interactions are not yet taken into account in existing models. In order to fill this gap, we propose a strategy to take charge into account. In particular, we introduce a quantitative model for aggregation of oppositely charged micron—to millimetre-sized objects settling in still air. Our results show that the presence of charge considerably enhances the collision efficiency when one of the colliding objects is very small (<20 µm), and that the sticking efficiency is not affected by particle charge if colliding objects are either small enough (<20 µm) or large enough (>200 µm). Besides providing a theoretical framework to quantify the effect of charge, our findings demonstrate that aggregation models that do not account for electrification significantly underestimate the amount of fine ash that sediments in the form of aggregates, leading to an overestimation of the residence time of fine ash in the atmosphere after explosive volcanic eruptions.

AB - The fine ash released into the atmosphere (particles <63 μm) during explosive volcanic eruptions represents a significant threat for both the ecosystem and many sectors of society. In order to mitigate the associated impact, ash dispersal models need to accurately estimate ash concentration through time and space. Since most fine ash sediments in the form of aggregates, ash dispersal models require a quantitative description of ash aggregation. The physical and chemical processes involved in the collision and sticking of volcanic ash have been extensively studied in the last few decades. Among the different factors affecting volcanic particle aggregation (e.g., turbulence, particle-particle adhesion, presence of liquid and solid water), the charge carried by volcanic particles has been found to play a crucial role. However, Coulomb interactions are not yet taken into account in existing models. In order to fill this gap, we propose a strategy to take charge into account. In particular, we introduce a quantitative model for aggregation of oppositely charged micron—to millimetre-sized objects settling in still air. Our results show that the presence of charge considerably enhances the collision efficiency when one of the colliding objects is very small (<20 µm), and that the sticking efficiency is not affected by particle charge if colliding objects are either small enough (<20 µm) or large enough (>200 µm). Besides providing a theoretical framework to quantify the effect of charge, our findings demonstrate that aggregation models that do not account for electrification significantly underestimate the amount of fine ash that sediments in the form of aggregates, leading to an overestimation of the residence time of fine ash in the atmosphere after explosive volcanic eruptions.

KW - collision efficiency

KW - collision map

KW - electrification

KW - sticking efficiency

KW - volcanic particle aggregation

UR - http://www.scopus.com/inward/record.url?scp=85101693639&partnerID=8YFLogxK

U2 - 10.3389/feart.2020.574106

DO - 10.3389/feart.2020.574106

M3 - Journal article

AN - SCOPUS:85101693639

VL - 8

JO - Frontiers of Earth Science

JF - Frontiers of Earth Science

SN - 2095-0195

M1 - 574106

ER -