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Authors: Bobrowski, N.*
von Glasow, R.*
Giuffrida, G. B.*
Tedesco, D.*
Aiuppa, A.*
Yalire, M.*
Arellano, S.*
Johansson, M.*
Galle, B.*
Title: Gas emission strength and evolution of the molar ratio of BrO/SO2 in the plume of Nyiragongo in comparison to Etna
Title of journal: Journal of geophysical research - atmospheres
Series/Report no.: /120(2015)
Publisher: American Geophysical Union
Issue Date: 12-Jan-2015
DOI: 10.1002/ 2013JD021069
Keywords: Intraplate volcano Nyiragongo is bromine rich although chlorine poor
BrO/Br in volcanic plumes depends on initial plume composition
Determination of Nyiragongo chlorine, bromine, sulfur emission strength
Abstract: Airborne and ground-based differential optical absorption spectroscopy observations have been carried out at the volcano Nyiragongo (Democratic Republic of Congo) tomeasure SO2 and bromine monoxide (BrO) in the plume inMarch 2004 and June 2007, respectively. Additionally filter pack andmulticomponent gas analyzer system (Multi-GAS)measurements were carried out in June 2007. Ourmeasurements provide valuable information on the chemical composition of the volcanic plume emitted fromthe lava lake of Nyiragongo. The main interest of this study has been to investigate for the first time the bromine emission flux of Nyiragongo (a rift volcano) and the BrO formation in its volcanic plume. Measurement data and results from a numerical model of the evolution of BrO in Nyiragongo volcanic plume are compared with earlier studies of the volcanic plume of Etna (Italy). Even though the bromine flux from Nyiragongo (2.6 t/d) is slightly greater than that from Etna (1.9 t/d), the BrO/SO2 ratio (maximum 7 × 10 5) is smaller than in the plume of Etna (maximum 2.1 × 10 4). A one-dimensional photochemical model to investigate halogen chemistry in the volcanic plumes of Etna and Nyiragongo was initialized using data from Multi-GAS and filter pack measurements. Model runs showed that the differences in the composition of volcanic volatiles led to a smaller fraction of total bromine being present as BrO in the Nyiragongo plume and to a smaller BrO/SO2 ratio.
Appears in Collections:04.08.01. Gases
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