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| Titel |
SO2-flux measurements and BrO/SO2 ratios at Guallatiri volcano, Altiplano, northern Chile |
| VerfasserIn |
Jonas Gliss, Kerstin Stebel, Helen Thomas |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250113268
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| Publikation (Nr.) |
 EGU/EGU2015-13466.pdf |
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| Zusammenfassung |
| Sulphur dioxide (SO2) fluxes were measured recently at Guallatiri volcano using two UV
SO2-cameras and one IR SO2-camera. Furthermore, measurements of reactive
halogens (e.g. BrO, OClO) were investigated using a high performance DOAS
(Differential Optical Absorption Spectroscopy) instrument. Guallatiri (18°Â25′Â00″
S, 69°Â5′Â30″ W, 6.071 m a.s.l.) is situated in the Altiplano in northern Chile,
close to the Bolivian border. The last known eruption of Guallatiri was in 1960.
The measurements were performed during a short-term field trip on three days in
November 2014 (20.11.-22.11.2014). During that time, the volcano showed a quiescent
degassing behaviour from the summit crater and from a fumarolic field on the southern
flank.
A preliminary evaluation of the spectra recorded with the DOAS instruments showed SO2
column amounts (SCDs) up to 3 /
1017 molec/cm2 and BrO-SCDs of the order of several 1013
molec/cm2. This corresponds to BrO/SO2-ratios of the order of 10-4 which is a typical order
of magnitude for volcanic emissions.
We will present SO2-flux estimates for Guallatiri volcano during these three days as well
as BrO/SO2-ratio estimates in dependence of different plume ages. Furthermore, we will
compare the results retrieved with the two UV-cameras with the data recorded simultaneously
with the IR-camera. |
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