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  Evaluating the structure and magnitude of the ash plume during the initial phase of the 2010 Eyjafjallajokull eruption using lidar observations and NAME simulations

Dacre, H. F., Grant, A. L. M., Hogan, R. J., Belcher, S. E., Thomson, D. J., Devenish, B. J., et al. (2011). Evaluating the structure and magnitude of the ash plume during the initial phase of the 2010 Eyjafjallajokull eruption using lidar observations and NAME simulations. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 116: D00U03. doi:10.1029/2011JD015608.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0018-10B4-4 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0018-10B8-B
Genre: Journal Article

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 Creators:
Dacre, H. F.1, Author
Grant, A. L. M.1, Author
Hogan, R. J.1, Author
Belcher, S. E.1, Author
Thomson, D. J.1, Author
Devenish, B. J.1, Author
Marenco, F.1, Author
Hort, M. C.1, Author
Haywood, J. M.1, Author
Ansmann, A.1, Author
Mattis, I.1, Author
Clarisse, L.1, Author
Affiliations:
1external, ou_persistent22              

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Free keywords: DISPERSION MODELS; SOURCE PARAMETERS; CLOUD TRANSPORT; PARTICLE; REDOUBT; VOLCANO; ALASKA
 Abstract: The Eyjafjallajokull volcano in Iceland erupted explosively on 14 April 2010, emitting a plume of ash into the atmosphere. The ash was transported from Iceland toward Europe where mostly cloud-free skies allowed ground-based lidars at Chilbolton in England and Leipzig in Germany to estimate the mass concentration in the ash cloud as it passed overhead. The UK Met Office's Numerical Atmospheric-dispersion Modeling Environment (NAME) has been used to simulate the evolution of the ash cloud from the Eyjafjallajokull volcano during the initial phase of the ash emissions, 14-16 April 2010. NAME captures the timing and sloped structure of the ash layer observed over Leipzig, close to the central axis of the ash cloud. Relatively small errors in the ash cloud position, probably caused by the cumulative effect of errors in the driving meteorology en route, result in a timing error at distances far from the central axis of the ash cloud. Taking the timing error into account, NAME is able to capture the sloped ash layer over the UK. Comparison of the lidar observations and NAME simulations has allowed an estimation of the plume height time series to be made. It is necessary to include in the model input the large variations in plume height in order to accurately predict the ash cloud structure at long range. Quantitative comparison with the mass concentrations at Leipzig and Chilbolton suggest that around 3% of the total emitted mass is transported as far as these sites by small (<100 mu m diameter) ash particles.

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Language(s): eng - English
 Dates: 2011
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: ISI: 000293091100010
DOI: 10.1029/2011JD015608
 Degree: -

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Title: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Source Genre: Journal
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Pages: - Volume / Issue: 116 Sequence Number: D00U03 Start / End Page: - Identifier: ISSN: 2169-897X