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| Titel |
Total ozone retrieval from GOME UV spectral data using the weighting function DOAS approach |
| VerfasserIn |
M. Coldewey-Egbers, M. Weber, L. N. Lamsal, R. Beek, M. Buchwitz, J. P. Burrows |
| 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 ; 5, no. 4 ; Nr. 5, no. 4 (2005-03-29), S.1015-1025 |
| Datensatznummer |
250002667
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| Publikation (Nr.) |
 copernicus.org/acp-5-1015-2005.pdf |
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| Zusammenfassung |
| A new algorithm approach called Weighting Function Differential Optical
Absorption Spectroscopy (WFDOAS) is presented which has been developed to
retrieve total ozone columns from nadir observations of the Global Ozone
Monitoring Experiment. By fitting the vertically integrated ozone weighting
function rather than ozone cross-section to the sun-normalized radiances, a
direct retrieval of vertical column amounts is possible. The new WFDOAS
approach takes into account the slant path wavelength modulation that is
usually neglected in the standard DOAS approach using single airmass
factors. This paper focuses on the algorithm description and error
analysis, while in a companion paper by Weber et al. (2004) a detailed
validation with groundbased measurements is presented. For the first time
several auxiliary quantities directly derived from the GOME spectral range
such as cloud-top-height and cloud fraction (O2-A band) and effective
albedo using the Lambertian Equivalent Reflectivity (LER) near 377nm are
used in combination as input to the ozone retrieval. In addition the varying
ozone dependent contribution to the Raman correction in scattered light
known as Ring effect has been included. The molecular ozone filling-in
that is accounted for in the new algorithm has the largest contribution
to the improved total ozone results from WFDOAS compared to the
operational product. The precision of the total ozone retrieval is estimated
to be better than 3% for solar zenith angles below 80°. |
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