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| Titel |
Evaluation of the MERIS aerosol product over land with AERONET |
| VerfasserIn |
J. Vidot, R. Santer, O. Aznay |
| 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. 24 ; Nr. 8, no. 24 (2008-12-17), S.7603-7617 |
| Datensatznummer |
250006522
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| Publikation (Nr.) |
 copernicus.org/acp-8-7603-2008.pdf |
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| Zusammenfassung |
| The Medium Resolution Imaging Spectrometer (MERIS) launched in February 2002
on-board the ENVISAT spacecraft is making global observations of
top-of-atmosphere (TOA) radiances. Aerosol optical properties are retrieved
over land using Look-Up Table (LUT) based algorithm and surface reflectances
in the blue and the red spectral regions. We compared instantaneous aerosol
optical thicknesses retrieved by MERIS in the blue and the red at locations
containing sites within the Aerosol Robotic Network (AERONET). Between 2002
and 2005, a set of 500 MERIS images were used in this study. The result
shows that, over land, MERIS aerosol optical thicknesses are well retrieved
in the blue and poorly retrieved in the red, leading to an underestimation
of the Angstrom coefficient. Correlations are improved by applying a simple
criterion to avoid scenes probably contaminated by thin clouds. To
investigate the weakness of the MERIS algorithm, ground-based radiometer
measurements have been used in order to retrieve new aerosol models, based
on their Inherent Optical Properties (IOP). These new aerosol models
slightly improve the correlation, but the main problem of the MERIS aerosol
product over land can be attributed to the surface reflectance model in the
red. |
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