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Aerosol layers from the 2008 eruptions of Mount Okmok and Mount Kasatochi: In situ upper troposphere and lower stratosphere measurements of sulfate and organics over Europe

Schmale, Julia and Schneider, Johannes and Jurkat, Tina and Voigt, Christiane and Kalesse, Heike and Rautenhaus, Marc and Lichtenstern, Michael and Schlager, Hans and Ancellet, Gerard and Arnold, Frank and Gerding, Michael and Mattis, Ina (2010) Aerosol layers from the 2008 eruptions of Mount Okmok and Mount Kasatochi: In situ upper troposphere and lower stratosphere measurements of sulfate and organics over Europe. Journal of Geophysical Research, 115 (D00L07), pp. 1-18. AGU. DOI: 10.1029/2009JD013628.

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Official URL: http://dx.doi.org/10.1029/2009JD013628

Abstract

In 2008 Mount Okmok and Mount Kasatochi started erupting on 12 July and 7 August, respectively, in the Aleutians, depositing emissions of trace gases and aerosols as high as 15.2 km into the atmosphere. During an aircraft campaign, conducted over Europe in between 27 October and 2 November 2008, the volcanic aerosol was measured by an Aerodyne aerosol mass spectrometer, capable of particle chemical composition measurements covering a size diameter range between 40 nm and 1 mm. In the volcanic aerosol layer enhanced submicron particulate sulfate concentrations of up to 2.0 mg m−3 standard temperature and pressure (STP) were observed between 8 and 12 km altitude, while background values did not exceed 0.5 mg m−3 (STP). Twenty‐one percent of the volcanic aerosol consisted of carbonaceous material that increased by a factor of 1.9 in mass compared to the free troposphere. Enhanced gaseous sulfur dioxide concentrations measured by an ion trap chemical ionization mass spectrometer of up to 1.3 mg m−3 were encountered. An onboard radiation measurement system simultaneously detected an enhanced aerosol signal. Furthermore, two German lidar stations identified an aerosol layer before and after the campaign. Data analysis shows that the aerosol layer was observed mainly in the lowermost stratosphere. Correlation of particulate sulfate concentration and sulfur dioxide mixing ratios indicates that after a 3 month residence time in the stratosphere, not all sulfur dioxide has been converted into sulfate aerosol. The significant fraction of organic material might have implications on heterogeneous chemistry in the stratosphere, which need to be explored more thoroughly.

Document Type:Article
Title:Aerosol layers from the 2008 eruptions of Mount Okmok and Mount Kasatochi: In situ upper troposphere and lower stratosphere measurements of sulfate and organics over Europe
Authors:
AuthorsInstitution or Email of Authors
Schmale, JuliaMPIC
Schneider, JohannesMPIC
Jurkat, TinaDLR
Voigt, ChristianeDLR/J. Gutenberg Univ.
Kalesse, HeikeJ. Gutenberg Univ.
Rautenhaus, MarcDLR
Lichtenstern, MichaelDLR
Schlager, HansDLR
Ancellet, GerardLATMOS
Arnold, FrankMPI-K/DLR
Gerding, MichaelLeibniz Inst. for Tropospheric Research
Mattis, InaLeibniz Inst. for Tropospheric Research
Date:17 September 2010
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:115
DOI:10.1029/2009JD013628
Page Range:pp. 1-18
Publisher:AGU
Status:Published
Keywords:volcanic aerosol volcanic aerosol, aerosol mass spectrometry, Kasatochi, airborne aerosol measurements
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:ATM and Operation
DLR - Research area:Aeronautics
DLR - Program:L AO - Air Traffic Management and Operation
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Tina Jurkat
Deposited On:16 Dec 2010 12:23
Last Modified:23 Jan 2014 11:36

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