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Sulphur dioxide and bromine monoxide emission inside the volcanic plume of Reventador, Ecuador

Abstract:

Reventador volcano has been actively degassing since a paroxysmal eruption in 2002 after 26 years or quiescence. Summer and autumn 2017 were characterized by frequent ash explosions, lava-and pyroclastic flows. Despite being active for more than 15 years, not many plume gas measurements have been undertaken at Reventador volcano so far, mostly because of its remote location and cloudy climate. We present three days of Sulphur dioxide (SO2) and bromine monoxide (BrO) slant column densities, SO2 emission rates as well as BrO/SO2 molar ratio inside the plume of Reventador during a field campaign from the 19th-21st September. During the observation period, Reventador was quite active, often showing several ash explosions every hour. We measured UV spectra using two MAX-DOAS instruments, scanning through the plume slightly downwind of the plume. The spectra are evaluated using …