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| Titel |
Yearly averaged BrO and SO2 emissions from Ambrym volcano as seen by the GOME-2 satellite instrument |
| VerfasserIn |
Christoph Hörmann, Holger Sihler, Nicole Bobrowsi, Steffen Beirle, Ulrich Platt, Thomas Wagner |
| 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 |
250080417
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| Zusammenfassung |
| Since bromine monoxide (BrO) of volcanic origin was detected for the first time
in the plume of the Soufrière Hills volcano by ground-based differential optical
absorption spectroscopy (DOAS) measurements in 2003, this species has been
regularly observed by ground-based instruments at several quiescent-degassing
volcanoes worldwide. Recently, the Global Ozone Monitoring Experiment satellite
instrument (GOME-2) has proven to be capable of monitoring volcanic BrO in volcanic
plumes also from space, during both, minor and major eruptions. However, long-term
measurements of BrO at continuous passively degassing volcanoes are usually only
provided from ground-based observations due to their higher sensitivity to weaker
emissions.
Here, we present the first space-based observations of enhanced BrO
abundances in the vicinity of the mostly quiescent-degassing Ambrym
volcano (Vanuatu) by yearly averaged GOME-2 satellite data in the years
2007–2012. The observed spatial BrO distribution in the plume is compared to the
corresponding mean distribution of volcanic sulphur dioxide (SO2), which is commonly used
as a tracer for volcanic emissions due to its relatively long lifetime and strong absorption
features in the UV wavelength range. The averaged data shows distribution patterns of both
species up to distances of - 100 km from the volcano and a clear linear correlation with mean
BrO/SO2 ratio of - 5 Ã 10-5 to 1 Ã 10-4 throughout the investigated time period. In
addition, an estimation of the lower limit of the total sulphur and bromine emissions will be
given. |
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