Regensburg 2016 – scientific programme
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UP: Fachverband Umweltphysik
UP 4: Poster Session
UP 4.14: Poster
Tuesday, March 8, 2016, 16:00–17:30, Foyer H41
Variations of the BrO/SO2 ratios from Tungurahua volcano, Ecuador — •Simon Warnach1, Peter Lübcke1, Florian Dinger1,2, Nicole Bobrowski1,3, Silvana Hidalgo4, Santiago Arellano5, Jean Battaglia6, Christoph Hörmann2, Mario Ruiz4, Leif Vogel7, Thomas Wagner2, and Ulrich Platt1 — 1IUP, Heidelberg — 2MPIC, Mainz — 3Institut f. Geowiss., Mainz — 4IGNEP, Quito, Ecuador — 5Chalmers Univ., Gothenburg, Sweden — 6Lab. Magmas et Volcans, Blaise Pascal, France — 7Basque Centre for Climate Change, Bilbao, Spain
The composition of volcanic gas emissions, in particular the molar ratio of BrO/SO2, has shown the potential for interpreting volcanic activity. This has been shown for long term spectral data collected through the Network for Observation of Volcanic and Atmospheric Change (NOVAC) at Nevado del Ruiz.
We retrieve the BrO and SO2 column densities at Tungurahua volcano, Ecuador, and present a time series of the BrO/SO2 ratio for several eruptive phases between 2007 and 2014. The variation of the BrO/SO2 ratio during these eruptive phases is compared to seismic data and volcanological phenomenological observations as well as satellite and ground based SO2 measurements. During several eruptive phases we observe an increase in the BrO/SO2 ratio on the transition from high explosive activity to low explosive activity. On such a transition during December 2010 for example we observe an increase of the BrO/SO2 ratio from 5.1× 10−5 and to 8.5× 10−5.