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| Titel |
SO2 and BrO observation in the plume of the Eyjafjallajökull volcano 2010: CARIBIC and GOME-2 retrievals |
| VerfasserIn |
K.-P. Heue, C. A. M. Brenninkmeijer, A. K. Baker, A. Rauthe-Schöch, D. Walter, T. Wagner, C. Hörmann, H. Sihler, B. Dix, U. Frieß, U. Platt, B. G. Martinsson, P. F. J. Velthoven, A. Zahn, R. Ebinghaus |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 6 ; Nr. 11, no. 6 (2011-03-31), S.2973-2989 |
| Datensatznummer |
250009533
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| Publikation (Nr.) |
 copernicus.org/acp-11-2973-2011.pdf |
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| Zusammenfassung |
| The ash cloud of the Eyjafjallajökull (also referred to as:
Eyjafjalla (e.g. Schumann et al., 2011), Eyjafjöll or Eyjafjoll
(e.g. Ansmann et al., 2010)) volcano on Iceland caused closure of large
parts of European airspace in April and May 2010. For the validation and
improvement of the European volcanic ash forecast models several research
flights were performed. Also the CARIBIC (Civil Aircraft for the Regular
Investigation of the atmosphere Based on an Instrument Container) flying
laboratory, which routinely measures at cruise altitude (≈11 km)
performed three dedicated measurements flights through sections of the ash
plume. Although the focus of these flights was on the detection and
quantification of the volcanic ash, we report here on sulphur dioxide
(SO2) and bromine monoxide (BrO) measurements with the CARIBIC DOAS
(Differential Optical Absorption Spectroscopy) instrument during the second
of these special flights on 16 May 2010. As the BrO and the SO2
observations coincide, we assume the BrO to have been formed inside the
volcanic plume. Average SO2 and BrO mixing ratios of ≈40 ppb and
≈5 ppt respectively are retrieved inside the plume. The BrO to
SO2 ratio retrieved from the CARIBIC observation is ≈1.3×10−4.
Both SO2 and BrO observations agree well with simultaneous
satellite (GOME-2) observations. SO2 column densities retrieved
from satellite observations are often used as an indicator for volcanic ash.
As the CARIBIC O4 column densities changed rapidly during the plume
observation, we conclude that the aerosol and the SO2 plume are
collocated. For SO2 some additional information on the local
distribution can be derived from a comparison of forward and back scan
GOME-2 data. More details on the local plume size and position are
retrieved by combining CARIBIC and GOME-2 data. |
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