Modelling reactive halogen formation and ozone depletion in volcanic plumes

Roberts, T.J.; Braban, C.F.; Martin, R.S.; Oppenheimer, C.; Adams, J.W.; Cox, R.A.; Jones, R.L.; Griffiths, P.T.. 2009 Modelling reactive halogen formation and ozone depletion in volcanic plumes. Chemical Geology, 1-4. 151-163.

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The detection of bromine monoxide (BrO) in the plume of Soufrière Hills volcano (Bobrowski et al., 2003) using ultraviolet Differential Optical Absorption Spectroscopy (40 DOAS) provided the first direct evidence for reactive halogen formation in volcanic plumes. BrO chemistry is known to have significant effects on tropospheric oxidants, as has been observed in other locations (polar troposphere, marine, salt plains (von Glasow and Crutzen, 2007)). This knowledge led to speculation that ozone may be destroyed in volcanic plumes through reactive halogen chemistry 45 (Bobrowski et al., 2003), and highlighted the need to understand the impact of volcanic plume chemistry on the troposphere (as discussed by von Glasow et al., this issue). Here we present studies using a new model, PlumeChem that simulates the reactive halogen chemistry of volcanic plumes. Model simulations of BrO formation in the downwind plume are presented and compared to observations from several volcanoes. The impacts of reactive halogen chemistry on volcanic 50 NOx speciation and on tropospheric ozone depletion are investigated

Item Type: Publication - Article
Digital Object Identifier (DOI):
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry > BG01 Measuring and modelling trace gas, aerosol and carbon
UKCEH and CEH Sections/Science Areas: Billett (to November 2013)
ISSN: 0009-2541
Additional Information. Not used in RCUK Gateway to Research.: for copies contact
Additional Keywords: Volcanic plume, Bromine monoxide, Chlorine monoxide, Reactive halogen, Ozone, Nitric acid
NORA Subject Terms: Earth Sciences
Atmospheric Sciences
Date made live: 01 Jun 2009 11:15 +0 (UTC)

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