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| Titel |
Bromine monoxide evolution in early plumes of Mutnovsky and Gorely (Kamchatka, Russia) |
| VerfasserIn |
N. Bobrowski, L. Vogel, U. Platt, S. Arellano, B. Galle, T. Hansteen, S. Bredemeyer |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064422
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| Zusammenfassung |
| In September 2011 during the 11th Field Workshop of the Commission on the Chemistry of
Volcanic gases (CCVG) Multi-axis Differential Optical Absorption Spectroscopy
(MAX-DOAS) measurements and Mini-DOAS traverses were carried out at the
volcanoes Mutnovsky and Gorely in Kamchatka, Russia. A SO2 camera was applied in
parallel.
Mutnovsky (52Ë 27’N, 158Ë 12’E, 2322 m.a.s.l.) is a stratovolcano whose volcanic
activity is currently characterized mainly by strong fumarolic degassing. Gorely (52Ë 33N,
158Ë ’02E, 1829 m) is a caldera volcano which currently comprises an acidic crater lake a
large, and often displays a non-condensing volcanic plume. It is a peculiarity that the plume
of Gorely volcano cannot (or only rarely) be recognized by visual observation, even though it
has a similar emission source strength as Etna (several thousand tons of gas every
day).
BrO/SO2 ratios were for the first time determined in the young volcanic plumes of both
Mutnovsky and Gorely volcanoes on the 5th and 6thSeptember 2011, respectively. The
instruments were set up at a distance to the summit of about 8 km in the case of Mutnovsky
and 4 km in the case of Gorely. Measurements were carried out at various azimuth angles and
therefore several plume ages. The investigated plume age could be calculated from the
wind velocity determined by the SO2 camera which was applied simultaneously
with the MAX DOAS system. Furthermore, plume traverses at Mutnovsky and
Gorely yielded SO2 emission fluxes of about 500 t/d and 1000 t/d, respectively. The
BrO/SO2 ratios range from below 0.5 x 105 up to about 6 x 105 with increasing
plume ages and follow therefore the previously observed trend at other volcanic
sites.
The data will be compared with earlier studies, e.g., at Mt Etna. Possible influence of
the different surrounding conditions, in particular the condensation, is discussed. |
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