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A case study of observations of volcanic ash from the Eyjafjallajökull eruption: 1. In situ airborne observations

Turnbull, Kate and Johnson, Ben and Marenco, Franco and Haywood, Jim and Minikin, Andreas and Weinzierl, Bernadett and Schlager, Hans and Schumann, Ulrich and Leadbetter, Susan and Woolley, Alan (2012) A case study of observations of volcanic ash from the Eyjafjallajökull eruption: 1. In situ airborne observations. Journal of Geophysical Research: Atmospheres, 117 (D00U12), pp. 1-19. DOI: 10.1029/2011JD016688. ISSN 0148-0227.

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Official URL: http://www.agu.org/pubs/crossref/2012/2011JD016688.shtml

Abstract

On 17 May 2010, the FAAM BAe-146 aircraft made remote and in situ measurements of the volcanic ash cloud from Eyjafjallaj�¶kull over the southern North Sea. The Falcon 20E aircraft operated by Deutsches Zentrum f�¼r Luft- und Raumfahrt (DLR) also sampled the ash cloud on the same day. While no â��wingtip-to-wingtipâ�� co-ordination was performed, the proximity of the two aircraft allows worthwhile comparisons. Despite the high degree of inhomogeneity (e.g., column ash loadings varied by a factor of three over �100 km) the range of ash mass concentrations and the ratios between volcanic ash mass and concentrations of SO2, O3 and CO were consistent between the two aircraft and within expected instrumental uncertainties. The data show strong correlations between ash mass, SO2 concentration and aerosol scattering with the FAAM BAe-146 data providing a specific extinction coefficient of 0.6â��0.8 m2 g�1. There were significant differences in the observed ash size distribution with FAAM BAe-146 data showing a peak in the mass at �3.5 mm (volume-equivalent diameter) and DLR data peaking at �10 mm. Differences could not be accounted for by refractive index and shape assumptions alone. The aircraft in situ and lidar data suggest peak ash concentrations of 500â��800 mg m�3 with a factor of two uncertainty. Comparing the location of ash observations with the ash dispersion model output highlights differences that demonstrate the difficulties in forecasting such events and the essential nature of validating models using high quality observational data from platforms such as the FAAM BAe-146 and the DLR Falcon.

Document Type:Article
Title:A case study of observations of volcanic ash from the Eyjafjallajökull eruption: 1. In situ airborne observations
Authors:
AuthorsInstitution or Email of Authors
Turnbull, KateMet Office, Exeter, UK
Johnson, BenMet Office, Exeter, UK
Marenco, FrancoMet Office, Exeter, UK
Haywood, JimMet Office, Exeter, UK
Minikin, AndreasDLR, IPA
Weinzierl, BernadettDLR, IPA
Schlager, HansDLR, IPA
Schumann, UlrichDLR, IPA
Leadbetter, SusanMet Office, Exeter, UK
Woolley, AlanFAAM, Cranfield, UK
Date:2012
Journal or Publication Title:Journal of Geophysical Research: Atmospheres
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:117
DOI:10.1029/2011JD016688
Page Range:pp. 1-19
ISSN:0148-0227
Status:Published
Keywords:volcanic ash plume, Eyjafjallaj�¶kull, Falcon 20E aircraft
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation (old)
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:16 Jul 2012 13:11
Last Modified:13 Nov 2014 15:09

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