Volcanic ash layer depth: processes and mechanisms
The long duration of the 2010 Eyjafjallajökull eruption provided a unique opportunity to measure a widely dispersed volcanic ash cloud. Layers of volcanic ash were observed by the European Aerosol Research Lidar Network with a mean depth of 1.2 km and standard deviation of 0.9 km. In this paper we e...
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American Geophysical Union
2015
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ftunivreading:oai:centaur.reading.ac.uk:40726 2024-06-23T07:52:36+00:00 Volcanic ash layer depth: processes and mechanisms Dacre, Helen Grant, Alan Harvey, Natalie Thomson, David Webster, Helen Marenco, Franco 2015-01-26 text https://centaur.reading.ac.uk/40726/ https://centaur.reading.ac.uk/40726/8/Dacre_et_al-2015-Geophysical_Research_Letters.pdf https://centaur.reading.ac.uk/40726/1/Dacre_LAYERS_GRL_final.pdf en eng American Geophysical Union https://centaur.reading.ac.uk/40726/8/Dacre_et_al-2015-Geophysical_Research_Letters.pdf https://centaur.reading.ac.uk/40726/1/Dacre_LAYERS_GRL_final.pdf Dacre, H. <https://centaur.reading.ac.uk/view/creators/90000932.html> orcid:0000-0003-4328-9126 , Grant, A. <https://centaur.reading.ac.uk/view/creators/90000767.html>, Harvey, N. <https://centaur.reading.ac.uk/view/creators/90005225.html> orcid:0000-0003-0973-5794 , Thomson, D., Webster, H. and Marenco, F. (2015) Volcanic ash layer depth: processes and mechanisms. Geophysical Research Letters, 42 (2). pp. 637-645. ISSN 0094-8276 doi: https://doi.org/10.1002/2014GL062454 <https://doi.org/10.1002/2014GL062454> Article PeerReviewed 2015 ftunivreading https://doi.org/10.1002/2014GL062454 2024-06-11T15:04:44Z The long duration of the 2010 Eyjafjallajökull eruption provided a unique opportunity to measure a widely dispersed volcanic ash cloud. Layers of volcanic ash were observed by the European Aerosol Research Lidar Network with a mean depth of 1.2 km and standard deviation of 0.9 km. In this paper we evaluate the ability of the Met Office's Numerical Atmospheric-dispersion Modelling Environment (NAME) to simulate the observed ash layers and examine the processes controlling their depth. NAME simulates distal ash layer depths exceptionally well with a mean depth of 1.2 km and standard deviation of 0.7 km. The dominant process determining the depth of ash layers over Europe is the balance between the vertical wind shear (which acts to reduce the depth of the ash layers) and vertical turbulent mixing (which acts to deepen the layers). Interestingly, differential sedimentation of ash particles and the volcano vertical emission profile play relatively minor roles. Article in Journal/Newspaper Eyjafjallajökull CentAUR: Central Archive at the University of Reading Geophysical Research Letters 42 2 637 645 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
language |
English |
description |
The long duration of the 2010 Eyjafjallajökull eruption provided a unique opportunity to measure a widely dispersed volcanic ash cloud. Layers of volcanic ash were observed by the European Aerosol Research Lidar Network with a mean depth of 1.2 km and standard deviation of 0.9 km. In this paper we evaluate the ability of the Met Office's Numerical Atmospheric-dispersion Modelling Environment (NAME) to simulate the observed ash layers and examine the processes controlling their depth. NAME simulates distal ash layer depths exceptionally well with a mean depth of 1.2 km and standard deviation of 0.7 km. The dominant process determining the depth of ash layers over Europe is the balance between the vertical wind shear (which acts to reduce the depth of the ash layers) and vertical turbulent mixing (which acts to deepen the layers). Interestingly, differential sedimentation of ash particles and the volcano vertical emission profile play relatively minor roles. |
format |
Article in Journal/Newspaper |
author |
Dacre, Helen Grant, Alan Harvey, Natalie Thomson, David Webster, Helen Marenco, Franco |
spellingShingle |
Dacre, Helen Grant, Alan Harvey, Natalie Thomson, David Webster, Helen Marenco, Franco Volcanic ash layer depth: processes and mechanisms |
author_facet |
Dacre, Helen Grant, Alan Harvey, Natalie Thomson, David Webster, Helen Marenco, Franco |
author_sort |
Dacre, Helen |
title |
Volcanic ash layer depth: processes and mechanisms |
title_short |
Volcanic ash layer depth: processes and mechanisms |
title_full |
Volcanic ash layer depth: processes and mechanisms |
title_fullStr |
Volcanic ash layer depth: processes and mechanisms |
title_full_unstemmed |
Volcanic ash layer depth: processes and mechanisms |
title_sort |
volcanic ash layer depth: processes and mechanisms |
publisher |
American Geophysical Union |
publishDate |
2015 |
url |
https://centaur.reading.ac.uk/40726/ https://centaur.reading.ac.uk/40726/8/Dacre_et_al-2015-Geophysical_Research_Letters.pdf https://centaur.reading.ac.uk/40726/1/Dacre_LAYERS_GRL_final.pdf |
genre |
Eyjafjallajökull |
genre_facet |
Eyjafjallajökull |
op_relation |
https://centaur.reading.ac.uk/40726/8/Dacre_et_al-2015-Geophysical_Research_Letters.pdf https://centaur.reading.ac.uk/40726/1/Dacre_LAYERS_GRL_final.pdf Dacre, H. <https://centaur.reading.ac.uk/view/creators/90000932.html> orcid:0000-0003-4328-9126 , Grant, A. <https://centaur.reading.ac.uk/view/creators/90000767.html>, Harvey, N. <https://centaur.reading.ac.uk/view/creators/90005225.html> orcid:0000-0003-0973-5794 , Thomson, D., Webster, H. and Marenco, F. (2015) Volcanic ash layer depth: processes and mechanisms. Geophysical Research Letters, 42 (2). pp. 637-645. ISSN 0094-8276 doi: https://doi.org/10.1002/2014GL062454 <https://doi.org/10.1002/2014GL062454> |
op_doi |
https://doi.org/10.1002/2014GL062454 |
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Geophysical Research Letters |
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42 |
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2 |
container_start_page |
637 |
op_container_end_page |
645 |
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1802643952892903424 |