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| Titel |
Novel SO2 spectral evaluation scheme using the 360–390 nm wavelength range |
| VerfasserIn |
N. Bobrowski, C. Kern, U. Platt, C. Hörmann, T. Wagner |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 4 ; Nr. 3, no. 4 (2010-07-08), S.879-891 |
| Datensatznummer |
250001207
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| Publikation (Nr.) |
 copernicus.org/amt-3-879-2010.pdf |
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| Zusammenfassung |
| Differential Optical Absorption Spectroscopy (DOAS) is a well established
spectroscopic method to determine trace gases in the atmosphere. During the
last decade, passive DOAS, which uses solar radiation scattered in the
atmosphere as a light source, has become a standard tool to determine
SO2 column densities and emission fluxes from volcanoes and other large
sources by ground based as well as satellite measurements. For the
determination of SO2 column densities, the structured absorption of the
molecule in the 300–330 nm region (due to the A1B1 ← X1A1 transition) is used.
However, there are several problems limiting the accuracy of the technique in this particular application. Here
we propose to use an alternative wavelength region (360–390 nm) due to the
spin-forbidden a3B2 ← X1A1 transition for
the DOAS evaluation of SO2 in conditions where high SO2 column
densities prevail. We show this range to have considerable advantages in
such cases, in particular when the particle content of the plume is high
and when measurements are performed at large distances from the area of
interest. |
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