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| Titel |
On the relative absorption strengths of water vapour in the blue wavelength range |
| VerfasserIn |
J. Lampel, D. Pöhler, J. Tschritter, U. Frieß, U. Platt |
| 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 ; 8, no. 10 ; Nr. 8, no. 10 (2015-10-15), S.4329-4346 |
| Datensatznummer |
250116641
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| Publikation (Nr.) |
 copernicus.org/amt-8-4329-2015.pdf |
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| Zusammenfassung |
In recent updates of the HITRAN water vapour H2O spectroscopic
compilation covering the blue spectral region (here: 394–480 nm)
significant changes for the absorption bands at 416 and 426 nm were
reported. In order to investigate the consistency of the different
cross-sections calculated from these compilations, H2O vapour column
density ratios for different spectral intervals were retrieved from long-path
and multi-axis differential optical absorption spectroscopy (DOAS)
measurements. We observed a significant improvement of the DOAS evaluation
when using the updated HITRAN water vapour absorption cross-sections for the
calculation of the reference spectra. In particular the magnitudes of the
residual spectra as well as the fit errors were reduced.
However, we also found that the best match between measurement and model is
reached when the absorption cross-section of groups of lines are scaled by
factors ranging from 0.5 to 1.9, suggesting that the HITRAN water vapour
absorption compilation still needs significant corrections. For this spectral
region we present correction factors for HITRAN 2009, HITRAN 2012, HITEMP and
BT2 derived from field measurements. Additionally, upper limits for water
vapour absorption in the UV-A range from 330 to 390 nm are given. |
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