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Detection of bromine monoxide in a volcanic plume

Abstract

The emission of volcanic gases usually precedes eruptive activity1, providing both a warning signal and an indication of the nature of the lava soon to be erupted. Additionally, volcanic emissions are a significant source of gases and particles to the atmosphere, influencing tropospheric and stratospheric trace-gas budgets2. Despite some halogen species having been measured in volcanic plumes3 (mainly HCl and HF), little is known about bromine compounds4 and, in particular, gas-phase reactive bromine species. Such species are especially important in the stratosphere5, as reactive bromine—despite being two orders of magnitude less abundant than chlorine—accounts for about one-third of halogen-catalysed ozone depletion6. In the troposphere, bromine-catalysed complete ozone destruction has been observed to occur regularly during spring in the polar boundary layers7,8,9,10,11 as well as in the troposphere above the Dead Sea basin12. Here we report observations of BrO and SO2 abundances in the plume of the Soufrière Hills volcano (Montserrat) in May 2002 by ground-based multi-axis differential optical absorption spectroscopy. Our estimate of BrO emission leads us to conclude that local ozone depletion and small ozone ‘holes’ may occur in the vicinity of active volcanoes, and that the amount of bromine emitted from volcanoes might be sufficiently large to play a role not only in the stratosphere, but also in tropospheric chemistry.

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Figure 1: Study area.
Figure 2: Cross-section of the plume from the observation point 4 km from the summit, on 25 May 2002.
Figure 3: Series scans of the volcanic plume on 24 May 2002, showing slant column densities of BrO and SO2.
Figure 4: Plot of all data points, 23–31 May 2002.

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Acknowledgements

We thank the staff of Montserrat Volcano Observatory, in particular G. Thomson, P. Dunkley and M. Edmonds, for their support during the field measurements.

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Correspondence to N. Bobrowski.

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Bobrowski, N., Hönninger, G., Galle, B. et al. Detection of bromine monoxide in a volcanic plume. Nature 423, 273–276 (2003). https://doi.org/10.1038/nature01625

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