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| Titel |
BrO/SO2 molar ratios from scanning DOAS measurements in the NOVAC network |
| VerfasserIn |
P. Lübcke, N. Bobrowski, S. Arellano, B. Galle, G. Garzón, L. Vogel, U. Platt |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 5, no. 1 ; Nr. 5, no. 1 (2014-06-04), S.409-424 |
| Datensatznummer |
250115276
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| Publikation (Nr.) |
 copernicus.org/se-5-409-2014.pdf |
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| Zusammenfassung |
| The molar ratio of BrO to SO2 is, like other
halogen/sulfur ratios, a possible precursor for dynamic changes in the shallow part
of a volcanic system. While the predictive significance of the
BrO/SO2 ratio has not been well constrained yet, it
has the major advantage that this ratio can be readily measured
using the remote-sensing technique differential optical absorption
spectroscopy (DOAS) in the UV. While BrO/SO2 ratios
have been measured during several short-term field campaigns, this
article presents an algorithm that can be used to obtain long-term
time series of BrO/SO2 ratios from the scanning
DOAS instruments of the Network for Observation of Volcanic and
Atmospheric Change (NOVAC) or comparable networks. Parameters of the
DOAS retrieval of both trace gases are given. The influence of
co-adding spectra on the retrieval error and influences of radiative transfer will be
investigated. Difficulties in the evaluation of spectroscopic data
from monitoring instruments in volcanic environments and possible
solutions are discussed. The new algorithm is demonstrated by
evaluating data from the NOVAC scanning DOAS systems at Nevado del
Ruiz, Colombia, encompassing almost 4 years of measurements
between November 2009 and end of June 2013. This data set shows
variations of the BrO/SO2 ratio several weeks prior
to the eruption on 30 June 2012. |
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