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| Titel |
Investigation of BrO in volcanic plumes: Comparing satellite data from OMI and GOME-2 |
| VerfasserIn |
Simon Warnach, Christoph Hörmann, Holger Sihler, Nicole Bobrowski, Steffen Beirle, Marloes Penning de Vries, Florian Dinger, Ulrich Platt, Thomas Wagner |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250150451
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| Publikation (Nr.) |
 EGU/EGU2017-14918.pdf |
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| Zusammenfassung |
| It has been repeatedly shown in the past by measurements from the ground and from
space that volcanic plumes contain widely varying amounts of bromine monoxide
(BrO). The relative amount of BrO in a volcanic plume, i. e. with respect to sulphur
dioxide (SO2), is mainly affected by degassing composition as well as chemical
processes, but the reasons for the variation is still not fully understood. Our study
aims at obtaining a better understanding of bromine emissions from volcanoes.
The high spatial resolution of current satellite instruments such as OMI (13x24
km2) and GOME-2 (40x80 km2), and particularly that of future instruments like
TROPOMI (3.5x7 km2) allows to resolve the volcanic plume of eruptive events and
makes. The combination of the high spatial resolution and the global coverage of
satellite instruments make it possible to study the spatial variability of trace gases in a
large number of volcanic plumes from a large number of volcanoes. In this study,
we investigate the BrO and SO2 distribution as well as the BrO/SO2 ratio within
volcanic plumes observed by OMI since 2007. We apply a plume detection algorithm
which uses the retrieved SO2 column for plume identification. These data obtained
from OMI measurements are compared to plumes identified from GOME-2 data.
Differences in the number of identified plumes and the degree of agreement regarding the
retrieved spatial distribution of BrO and SO2, as well as the calculated BrO/SO2
ratio between plumes observed by both instruments, are discussed. Differences are
mainly attributed to the differences between the two instruments with respect to
spatial resolution and overpass time (GOME-2 at 9:30, OMI at 13:30 local time). |
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