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| Titel |
GOMOS data characterisation and error estimation |
| VerfasserIn |
J. Tamminen, E. Kyrölä, V. F. Sofieva, M. Laine, J.-L. Bertaux, A. Hauchecorne, F. Dalaudier, D. Fussen, F. Vanhellemont, O. Fanton-d'Andon, G. Barrot, A. Mangin, M. Guirlet, L. Blanot, T. Fehr, L. Saavedra de Miguel, R. Fraisse |
| 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. 19 ; Nr. 10, no. 19 (2010-10-08), S.9505-9519 |
| Datensatznummer |
250008815
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| Publikation (Nr.) |
 copernicus.org/acp-10-9505-2010.pdf |
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| Zusammenfassung |
The Global Ozone Monitoring by Occultation of Stars
(GOMOS) instrument uses stellar occultation technique for monitoring
ozone, other trace gases and aerosols in the stratosphere and mesosphere. The
self-calibrating measurement principle of GOMOS together with
a relatively simple data retrieval where only minimal use of a priori
data is required provides excellent possibilities for long-term
monitoring of atmospheric composition.
GOMOS uses about 180 of the brightest stars as its light
source. Depending on the individual spectral characteristics of the
stars, the signal-to-noise ratio of GOMOS varies from star to star,
resulting also in varying accuracy of retrieved profiles. We present
here an overview of the GOMOS data characterisation and error
estimation, including modeling errors, for O3, NO2,
NO3, and aerosol profiles. The retrieval error (precision) of
night-time measurements in the stratosphere is typically 0.5–4% for
ozone, about 10–20% for NO2, 20–40% for NO3 and 2–50%
for aerosols. Mesospheric O3, up to 100 km, can be measured with
2–10% precision. The main sources of the modeling error are
incompletely corrected scintillation, inaccurate aerosol modeling,
uncertainties in cross sections of trace gases and in atmospheric
temperature. The sampling resolution of GOMOS varies depending on the
measurement geometry. In the data inversion a Tikhonov-type
regularization with pre-defined target resolution requirement is
applied leading to 2–3 km vertical resolution for ozone and 4 km resolution
for other trace gases and aerosols. |
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