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Volcanic ash layer depth: processes and mechanisms

Dacre, H., Grant, A., Harvey, N., 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

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To link to this article DOI: 10.1002/2014GL062454

Abstract/Summary

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.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical and Physical Sciences > Department of Meteorology
ID Code:40726
Publisher:American Geophysical Union

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