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| Titel |
Improved ozone profile retrievals from GOME data with degradation correction in reflectance |
| VerfasserIn |
X. Liu, K. Chance, T. P. Kurosu |
| 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 ; 7, no. 6 ; Nr. 7, no. 6 (2007-03-23), S.1575-1583 |
| Datensatznummer |
250004830
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| Publikation (Nr.) |
 copernicus.org/acp-7-1575-2007.pdf |
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| Zusammenfassung |
| We present a simple method to perform degradation
correction to Global Ozone Monitoring Experiment (GOME) reflectance spectra
by comparing the average reflectance for 60° N–60° S with that at
the beginning of GOME observations (July–December 1995) after removing the dependences on solar
zenith angle and seasonal variation. The results indicate positive
biases of up to ~15–25% in the wavelength range 289–370 nm
during 2000–2002; the degradation also exhibits significant dependence on
wavelength and viewing zenith angle. These results are consistent with previous
studies using radiative transfer models and ozone observations. The degradation causes retrieval biases of up to ~3%
(10 DU, 1 DU=2.69×1016 molecules cm−2), 30% (10 DU),
10%, and 40% in total column ozone, tropospheric column ozone,
stratospheric ozone and tropospheric ozone, respectively, from our GOME
ozone profile retrieval algorithm. In addition, retrieval biases due to degradation vary
significantly with latitude. The application of this degradation
correction improves the retrievals relative to Dobson and
ozonesonde measurements at Hohenpeißenberg station during 2000–2003 and improves the
spatiotemporal consistency of retrieval quality during 1996–2003. However,
because this method assumes that the deseasonalized globally-averaged reflectance
does not change much with time, retrievals with this correction may be inadequate
for trend analysis. In addition, it does not correct for instrument biases that have occurred since launch. |
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