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Article
Halogen emissions from a small volcanic eruption: Modeling the peak concentrations, dispersion, and volcanically induced ozone loss in the stratosphere
Geophysical Research Letters
  • G. A. Millard, University of Cambridge
  • T. A. Mather, University of Cambridge
  • D. M. Pyle, University of Cambridge
  • William I. Rose, Michigan Technological University
  • B. Thornton, University of Colorado Boulder
Document Type
Article
Publication Date
10-12-2006
Abstract
Aircraft measurements in the Hekla, Iceland volcanic plume in February 2000 revealed large quantities of hydrogen halides within the stratosphere correlated to volcanic SO2. Investigation of the longer-term stratospheric impact of these emissions, using the 3D chemical transport model, SLIMCAT suggests that volcanic enhancements of H2O and HNO3 increased HNO3·3H2O particle availability within the plume. These particles activated volcanic HCl and HBr, enhancing model plume concentrations of ClOx (20 ppb) and BrOx (50 ppt). Model O3 concentrations decreased to near-zero in places, and plume average O3 remained 30% lower after two weeks. Reductions in the model O3column reduced UV shielding by 15% for 2 days. Plume incorporation into the winter polar vortex after 1 March elevated model vortex Cly and Bry by 0.15 ppb and 7 ppt respectively, and doubled vortex ClOxand BrO. Model results agree quantitatively with the observations made by the DC-8 aircraft.
Publisher's Statement

© 2006 American Geophysical Union. Publisher's version of record: http://dx.doi.org/10.1029/2006GL026959

Citation Information
G. A. Millard, T. A. Mather, D. M. Pyle, William I. Rose, et al.. "Halogen emissions from a small volcanic eruption: Modeling the peak concentrations, dispersion, and volcanically induced ozone loss in the stratosphere" Geophysical Research Letters Vol. 33 Iss. 19 (2006)
Available at: http://works.bepress.com/william-rose/79/