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Airborne stratospheric ITCIMS measurements of SO2, HCl, and HNO3 in the aged plume of volcano Kasatochi

Jurkat, Tina and Voigt, Christiane and Arnold, Frank and Schlager, Hans and Aufmhoff, Heinfried and Schmale, Julia and Schneider, Johannes and Lichtenstern, Michael and Dörnbrack, Andreas (2010) Airborne stratospheric ITCIMS measurements of SO2, HCl, and HNO3 in the aged plume of volcano Kasatochi. Journal of Geophysical Research, 115 (D00L17), pp. 1-14. AGU. DOI: 10.1029/2010JD013890.

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Official URL: http://dx.doi.org/10.1029/2010JD013890


Major explosive volcanic eruptions inject gases and ash particles into the stratosphere, resulting in significant impacts on ozone and climate. Here we report on fast and sensitive in situ measurements of sulfur dioxide (SO2), hydrochloric acid (HCl), and nitric acid (HNO3) in an aged stratospheric plume of volcanic origin made by an ion trap chemical ionization mass spectrometer (ITCIMS) aboard the research aircraft Falcon. Other instruments on the Falcon measured reactive nitrogen (NOy), carbon monoxide (CO), and ozone (O3) as well as the aerosol composition. The plume most likely originated from the 7�8 August 2008 eruption of the Aleutian volcano Kasatochi and almost 3 months later, on 31 October 2008, was encountered by the aircraft during two missions over Europe at altitudes between 7000 and 11,600 m. Within the plume, SO2 mixing ratios of up to 0.51 ppbv were about a factor of 10 higher than in the background stratosphere (0.02�0.055 ppbv). The molar ratios HCl/O3 and HNO3/NOy tended to be elevated by up to 19%, and HNO3/O3 also showed a substantial enhancement inside the plume. From our measurements we infer an upper limit of the e�folding lifetime of 62 days for SO2 conversion in the stratosphere, indicating that approximately 25% of the volcanic SO2 had not yet experienced OH�induced conversion to sulfuric acid. Our measurements contribute to a better understanding of the formation of volcanic aerosol and of heterogeneous reactions taking place on these particles in the lower stratosphere.

Document Type:Article
Title:Airborne stratospheric ITCIMS measurements of SO2, HCl, and HNO3 in the aged plume of volcano Kasatochi
AuthorsInstitution or Email of Authors
Jurkat, TinaDLR
Voigt, ChristianeDLR
Arnold, FrankMPI-K
Schlager, HansDLR
Aufmhoff, HeinfriedMPI-K/DLR
Schmale, JuliaMPIC
Schneider, JohannesMPIC
Lichtenstern, MichaelDLR
Dörnbrack, AndreasDLR
Date:9 November 2010
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-14
Keywords:mass spectrometry, volcanic plume, sulfur dioxide
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 11:29
Last Modified:23 Jan 2014 11:36

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