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| Titel |
Validity of satellite measurements used for the monitoring of UV radiation risk on health |
| VerfasserIn |
F. Jégou, S. Godin-Beekman, M. P. Correa, C. Brogniez, F. Auriol, V. H. Peuch, M. Haeffelin, A. Pazmino, P. Saiag, F. Goutail, E. Mahé |
| 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 ; 11, no. 24 ; Nr. 11, no. 24 (2011-12-22), S.13377-13394 |
| Datensatznummer |
250010308
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| Publikation (Nr.) |
 copernicus.org/acp-11-13377-2011.pdf |
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| Zusammenfassung |
| In order to test the validity of ultraviolet index (UVI) satellite products
and UVI model simulations for general public information, intercomparison
involving three satellite instruments (SCIAMACHY, OMI and GOME-2), the
Chemistry and Transport Model, Modélisation de la Chimie Atmosphérique
Grande Echelle (MOCAGE), and ground-based instruments was performed in 2008
and 2009. The intercomparison highlighted a systematic high bias of
~1 UVI in the OMI clear-sky products compared to the SCIAMACHY and TUV
model clear-sky products. The OMI and GOME-2 all-sky products are close to
the ground-based observations with a low 6 % positive bias, comparable to
the results found during the satellite validation campaigns. This result
shows that OMI and GOME-2 all-sky products are well appropriate to evaluate
the UV-risk on health. The study has pointed out the difficulty to take into
account either in the retrieval algorithms or in the models, the large
spatial and temporal cloud modification effect on UV radiation. This factor
is crucial to provide good quality UV information. OMI and GOME-2 show a
realistic UV variability as a function of the cloud cover. Nevertheless these
satellite products do not sufficiently take into account the radiation
reflected by clouds. MOCAGE numerical forecasts show good results during
periods with low cloud covers, but are actually not adequate for overcast
conditions; this is why Météo-France currently uses human-expertised
cloudiness (rather than direct outputs from Numerical Prediction Models)
together with MOCAGE clear-sky UV indices for its operational forecasts. From
now on, the UV monitoring could be done using free satellite products (OMI,
GOME-2) and operational forecast for general public by using modelling, as
long as cloud forecasts and the parametrisation of the impact of cloudiness
on UV radiation are adequate. |
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