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| Titel |
Mid-latitude ozone monitoring with the GOMOS-ENVISAT experiment version 5: the noise issue |
| VerfasserIn |
P. Keckhut, A. Hauchecorne, L. Blanot, K. Hocke, S. Godin-Beekmann, J.-L. Bertaux, G. Barrot, E. Kyrölä, J. A. E. Gijsel, A. Pazmino |
| 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 ; 10, no. 23 ; Nr. 10, no. 23 (2010-12-13), S.11839-11849 |
| Datensatznummer |
250008956
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| Publikation (Nr.) |
 copernicus.org/acp-10-11839-2010.pdf |
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| Zusammenfassung |
| The GOMOS ozone profiles have been analysed to evaluate the GOMOS
ability to capture the long-term ozone evolution at mid-latitudes
during the expected recovery phase of the ozone layer. Version 5 of
the operational GOMOS ozone data has been compared with data from
two of the longest ground-based instruments based on different
techniques and already involved with many other previous space
instrument validations. Comparisons between ground-based and GOMOS
data confirm the occurrence of spurious retrievals mainly occurring
since 2006. Using a selected set of data it is shown that some bad
retrievals are induced by the increasing dark charge of the
detectors combined with an inadequate method for its correction.
This effect does not only induce a continuous bias, but is rather
exhibiting a bimodal distribution including the correct profiles and
the bad retrievals. For long-term analyses it is recommended
filtering the data according to background light conditions and star
temperature (spectrum shape). The new method of the dark charge
estimate proposed to be implemented in the version 6 of the ESA
algorithm seems to significantly reduce the occurrence of such
effects and should allow to monitor stratospheric ozone using GOMOS
data with greater confidence. |
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