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  Bromine monoxide in volcanic plumes - A global survey of volcanic plume composition and chemistry derived from Sentinel-5 Precursor/TROPOMI data

Warnach, S. (2022). Bromine monoxide in volcanic plumes - A global survey of volcanic plume composition and chemistry derived from Sentinel-5 Precursor/TROPOMI data (PhD Thesis, Universität, Heidelberg, 2022). doi:10.11588/heidok.00031910.

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 Creators:
Warnach, Simon1, Author           
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1Satellite Remote Sensing, Max Planck Institute for Chemistry, Max Planck Society, ou_1826293              

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 Abstract: Bromine monoxide (BrO) is a radical which influences chemical processes in the atmosphere, in particular the abundance of ozone. Furthermore, the molar bromine to sulphur ratio in volcanic gas emissions is a proxy for the magmatic composition of a volcano and potentially an eruption forecast parameter. In this thesis, the distribution of SO2, BrO and the BrO/SO2 ratio in volcanic gas plumes is surveyed globally over a four-year period (2018 - 2021) using Differential Optical Absorption Spectroscopy (DOAS) and spectral data of the S-5P/TROPOMI satellite instrument. TROPOMI's high spatial resolution (up to 3.5x5.5 km^2) and its daily global coverage yield BrO/SO2 ratios even for minor eruptions and quiescent degassing. Plumes are automatically detected globally through a plume detection algorithm, leading to a total of 4323 volcanic plumes and a detection of BrO in 1449 of them. 3063 volcanic plumes can be clearly assigned to 43 volcanoes, for which subsequently the mean BrO/SO2 ratio is calculated - increasing the global data-base of reported BrO/SO2 ratios from 28 to 60 volcanoes. For the first time, BrO/SO2 ratios were successfully determined for pure hot spot volcanoes - all of which yield low BrO/SO2 ratios of 5x 10^-5, in contrast to 2-16x 10^-5 for arc volcanoes. The observed BrO/SO2 ratios were in good agreement with ground-based measurements. A spatial gradient of decreasing BrO/SO2 ratio towards the plume's center within major volcanic plumes could be attributed to O3 destruction in the plume's center both from a conceptual model and an empirical plume model. The decrease in the BrO/SO2 towards the center was observed over 1000 km, indicating the strong chemical impact of reactive volcanic halogenes in the atmosphere

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Language(s): eng - English
 Dates: 2022-07-11
 Publication Status: Published online
 Pages: 220 S.
 Publishing info: Heidelberg : Universität
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.11588/heidok.00031910
 Degree: PhD

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