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| Titel |
Pole-to-pole validation of GOME WFDOAS total ozone with groundbased data |
| VerfasserIn |
M. Weber, L. N. Lamsal, M. Coldewey-Egbers, K. Bramstedt, 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. 5 ; Nr. 5, no. 5 (2005-06-07), S.1341-1355 |
| Datensatznummer |
250002813
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| Publikation (Nr.) |
 copernicus.org/acp-5-1341-2005.pdf |
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| Zusammenfassung |
| This paper summarises the validation of GOME total ozone retrieved
using the Weighting Function Differential Optical Absorption
Spectroscopy (WFDOAS) algorithm Version 1.0. This algorithm has been
described in detail in a companion paper by
Coldewey-Egbers et al. (2005). Compared to the operational GDP (GOME Data
Processor) V3, several improvements to the total ozone retrieval
have been introduced that account for the varying ozone dependent
contribution to rotational Raman scattering, includes a new cloud
scheme, and uses the GOME measured effective albedo in the
retrieval. In this paper the WFDOAS results have been compared with
selected ground-based measurements from the WOUDC (World Ozone and
UV Radiation Data Centre) that collects total ozone measurements
from a global network of stations covering all seasons. From the
global validation excellent agreement between WFDOAS and ground data
was observed. The agreement lies within ±1%, and very little
seasonal variations in the differences are found. In the polar
regions and at high solar zenith angles, however, a positive bias
varying between 5 and 8% is found near the polar night period. As a
function of solar zenith angle as well as of the retrieved total
ozone, the WFDOAS differences to ground polar data, however, show a
much weaker dependence as compared to the operational GOME Data
Processor Version 3 of GOME that represents a significant
improvement. Very few stations carry out simultaneous measurements
by Brewer and Dobson spectrometers over an extended period (three
years or more). Simultaneous Brewer and Dobson measurements from
Hradec Kralove, Czech Republic (50.2N, 15.8E) and
Hohenpeissenberg, Germany (47.8N, 11.0E) covering the
period 1996-1999 have been compared with our GOME results.
Agreement with Brewers are generally better than with the
simultaneous Dobson measurements and this may be explained by the
neglect of stratospheric (ozone) temperature correction in the
standard ozone retrieval from the ground. |
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