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| Titel |
BrO/SO2 ratios from the NOVAC network |
| VerfasserIn |
Peter Lübcke, Nicole Bobrowski, Bo Galle, Guastavo Garzon, Leif Vogel, Ulrich Platt |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072192
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| Zusammenfassung |
| The halogen/sulphur ratio is an important indicator for dynamical changes in the upper part of
a volcanic system. In particular, the BrO/SO2 ratio was recently suggested to be an indicator
for changes in volcanic activity. This ratio can be assessed by Differential Optical
Absorption Spectroscopy measurements in the UV. SO2 is emitted by volcanoes and
relatively stable on time-scales usually observed during ground-based remote-sensing
measurements. On the other hand, BrO is not directly released from volcanoes,
but probably a product of photochemical oxidation of primary emitted HBr in the
atmosphere.
This study presents BrO/SO2 ratios measured from the Network for Observation of
Volcanic and Atmospheric Change (NOVAC). NOVAC has so far installed 64 spectrometers
at 24 volcanoes world-wide, some of which measure volcanic gas and their fluxes for 7
years. This vast database will allow to correlate changes in the BrO/SO2 ratio with
volcanic activity and to investigate other parameters that might influence the formation
of BrO in the volcanic plume, i.e., meteorology and time since release from the
volcano.
We show that it is possible to obtain BrO/SO2 ratios from the Type 1 NOVAC
instrumentation at Nevado del Ruiz, Colombia, and present an adapted data evaluation
scheme. Issues in the evaluation of automatically acquired spectroscopic data will be
discussed and possible solutions will be suggested and application to the data will be shown.
This includes the correct parameter settings for the BrO and SO2 evaluation, the availability
of reference spectra and problems with the variation of the instrument temperature.
Measurement results and BrO/SO2 time-series will be presented and the possibilities of the
data set will be illustrated. |
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