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Authors: Louban, I.* 
Bobrowski, N.* 
Rouwet, D.* 
Inguaggiato, S.* 
Platt, U.* 
Title: Imaging DOAS for volcanological applications
Issue Date: 2009
Series/Report no.: 7/71(2009)
DOI: 10.1007/s00445-008-0262-6
Keywords: DOAS
Imaging DOAS
Volcanic plume
Subject Classification01. Atmosphere::01.01. Atmosphere::01.01.07. Volcanic effects 
01. Atmosphere::01.01. Atmosphere::01.01.08. Instruments and techniques 
04. Solid Earth::04.08. Volcanology::04.08.01. Gases 
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring 
04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques 
Abstract: The simultaneous quantitative determination of two-dimensional bromine monoxide (BrO) and sulphur dioxide (SO2) distributions in volcanic gas plumes is described. Measurements at the fumarolic field on the island Vulcano (autumn 2004) and in the plume of Mt. Etna volcano (spring 2005) were carried out with an Imaging DOAS instrument. The SO2 fluxes of several fumaroles were estimated from two-dimensional distributions of SO2. Additionally, the first two-dimensional distributions of BrO within a volcanic plume were successfully retrieved. Slant column densities of up to 2.6×1014 molecules per square centimetre were detected in the plume of Mt. Etna. The investigation of the BrO/SO2 ratio, calculated from the two-dimensional distributions of SO2 and BrO, shows an increase from the centre to the edge of the volcanic plume. These results have significance for the involvement of ozone during BrO formation processes in volcanic emissions.
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