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| Titel |
Different wavelength evaluation ranges in the retrieval of trace gases with DOAS at the example of BrO |
| VerfasserIn |
Leif Vogel, Holger Sihler, Johannes Lampel, Thomas Wagner, Ulrich Platt |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250043007
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| Zusammenfassung |
| Optical remote sensing via scattered sunlight Differential Optical Absorption Spectroscopy
(DOAS) is routinely used to determine various trace gases in the atmosphere. Different
applications and platforms (e.g. DOAS of volcanic plumes, Satellite measurements,
Zenith DOAS or Max-DOAS) differ in measurement conditions, cross correlations of
absorptions of different trace gases and their respective concentrations. Here, we present a
method to determine the optimal evaluation range at the example of Bromine Oxide
(BrO).
With strongest absorption features of BrO between 315nm - 360nm, its retrieval results can
depend on cross correlations with strong absorbers like ozone (O3) or sulfur dioxide (SO2).
Whereas O3 influences especially satellite and stratospheric measurements, SO2 cannot be
neglected in the case of high volcanic gas emissions. Absorption features of both species are
most pronounced at low wavelengths, but their diminished influence at higher wavelength
ranges competes with a higher detection limit of BrO. The study is performed with both
artificial and measured spectra of volcanic plumes, satellite and marine Max-DOAS
measurements. |
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