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| Titel |
Comparison of total ozone and erythemal UV data from OMI with ground-based measurements at Rome station |
| VerfasserIn |
I. Ialongo, G. R. Casale, A. M. Siani |
| 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 ; 8, no. 12 ; Nr. 8, no. 12 (2008-06-27), S.3283-3289 |
| Datensatznummer |
250006231
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| Publikation (Nr.) |
 copernicus.org/acp-8-3283-2008.pdf |
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| Zusammenfassung |
| Ground-based total ozone and surface UV irradiance measurements have been
collected since 1992 using Brewer spectrophotometer at Rome station.
Erythemal Dose Rates (EDRs) have been also determined by a broad-band
radiometer (model YES UVB-1) operational since 2000. The methodology to
retrieve the EDR and the Erythemal Daily Dose (EDD) from the radiometer
observations is described. Ground-based measurements were compared with
satellite-derived total ozone and UV data from the Ozone Monitoring
Instrument (OMI). OMI, onboard the NASA EOS Aura spacecraft, is a nadir
viewing spectrometer that provides total ozone and surface UV retrievals. The
results of the validation exercise showed satisfactory agreement between OMI
and Brewer total ozone data, for both OMI-TOMS and OMI-DOAS ozone algorithms
(biases of −1.8% and −0.7%, respectively). Regarding UV data, OMI data
overestimate ground based erythemally weighted UV irradiances retrieved from
both Brewer and YES Radiometer (biases about 20%). The effect of aerosols on
UV comparisons was investigated in terms of Aerosol Optical Depth (AOD),
showing medium-large correlation at SZA larger than 55°. Further
sources of uncertainty, such as the difference in the atmospheric conditions
between local noon and OMI overpass time and the OMI spatial resolution, were
also discussed. |
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