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

Turnbull, Kate und Johnson, Ben und Marenco, Franco und Haywood, Jim und Minikin, Andreas und Weinzierl, Bernadett und Schlager, Hans und Schumann, Ulrich und Leadbetter, Susan und 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), Seiten 1-19. DOI: 10.1029/2011JD016688. ISSN 0148-0227.

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

Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:A case study of observations of volcanic ash from the Eyjafjallajökull eruption: 1. In situ airborne observations
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
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
Datum:2012
Erschienen in:Journal of Geophysical Research: Atmospheres
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:117
DOI :10.1029/2011JD016688
Seitenbereich:Seiten 1-19
ISSN:0148-0227
Status:veröffentlicht
Stichwörter:volcanic ash plume, EyjafjallajÃ�¶kull, Falcon 20E aircraft
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:ATM und Flugbetrieb (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AO - Luftverkehrsmanagement und Flugbetrieb
DLR - Teilgebiet (Projekt, Vorhaben):L - Klima, Wetter und Umwelt (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Atmosphärische Spurenstoffe
Hinterlegt von: Jana Freund
Hinterlegt am:16 Jul 2012 13:11
Letzte Änderung:13 Nov 2014 15:09

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