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| Titel |
Aerosol Single Scattering Albedo retrieval in the UV range: an application to OMI satellite validation |
| VerfasserIn |
I. Ialongo, V. Buchard, C. Brogniez, 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 ; 10, no. 2 ; Nr. 10, no. 2 (2010-01-18), S.331-340 |
| Datensatznummer |
250007947
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| Publikation (Nr.) |
 copernicus.org/acp-10-331-2010.pdf |
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| Zusammenfassung |
The aerosol Single Scattering Albedo (SSA) and Absorbing Aerosol Optical Depth
(AAOD) at 320.1 nm are derived at Rome site by the comparison between Brewer
and modelled spectra. The UVSPEC radiative transfer model is used to
calculate the UV irradiances for different SSA values, taking into account
as input data total ozone and Aerosol Optical Depth (AOD) obtained from
Brewer spectral measurements. The accuracy in determining SSA depends
on the aerosol amount and on Solar Zenith Angle (SZA) value: SSA
uncertainty increases when AOD and SZA decrease. The monthly mean
values of SSA and AAOD during the period January 2005–June 2008
are analysed, showing a monthly and seasonal variability. It is
found that the SSA and AAOD averages are 0.80±0.08 and 0.056±0.028,
respectively.
AAOD retrievals are also used to quantify the error in the Ozone Monitoring
Instrument (OMI) surface UV products due to absorbing aerosols, not included
in the current OMI UV algorithm. OMI and Brewer UV irradiances at 324.1 nm
and Erythemal Dose Rates (EDRs) under clear sky conditions, are compared
as a function of AAOD. Three methods are considered to investigate on the
applicability of an absorbing aerosol correction on OMI UV data at Rome
site. Depending on the correction methodology, the bias value decreases
from 18% to 2% for spectral irradiance at 324.1 nm and from 25%
to 8% for EDR. |
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