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| Titel |
Linearisation of the effects of spectral shift and stretch in DOAS analysis |
| VerfasserIn |
S. Beirle, H. Sihler, 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 ; 6, no. 3 ; Nr. 6, no. 3 (2013-03-13), S.661-675 |
| Datensatznummer |
250017839
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| Publikation (Nr.) |
 copernicus.org/amt-6-661-2013.pdf |
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| Zusammenfassung |
Differential Optical Absorption Spectroscopy (DOAS) is a widely used method
to quantify atmospheric trace gases from spectroscopic measurements. While
DOAS can, in principal, be described by a linear equation system, usually
nonlinearities occur, in particular as a consequence of spectral
misalignments.
Here we propose to linearise the effects of a spectral shift by including a
"shift spectrum", which is the first term of a Taylor expansion, as
pseudo-absorber in the DOAS fit. The effects of a spectral stretch are
considered as additional wavelength-dependent shifts.
Solving the DOAS equation system linearly has several advantages: the
solution is unique, the algorithm is robust, and it is very fast. The latter
might be particularly important for measurements with high data rates, like
for upcoming satellite missions. |
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