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| Titel |
A sensitivity analysis of Ring effect to aerosol properties and comparison to satellite observations |
| VerfasserIn |
T. Wagner, S. Beirle, T. Deutschmann, M. Penning de Vries |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 3, no. 6 ; Nr. 3, no. 6 (2010-12-16), S.1723-1751 |
| Datensatznummer |
250001371
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| Publikation (Nr.) |
 copernicus.org/amt-3-1723-2010.pdf |
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| Zusammenfassung |
In this study we explore the sensitivity of satellite
observations of the Ring effect (at various wavelengths) to atmospheric
aerosol properties. Compared to clouds, aerosols have a rather weak
influence on the Ring effect, thus the requirements on the accuracy of the
measurements and the radiative transfer simulations are high. In this study,
we show that for moderate and high aerosol optical depth (AOD), Ring effect
observations are sensitive enough to yield information not only on the AOD,
but also on the absorbing properties of aerosols and the aerosol layer
height. The latter two quantities are especially important for the
determination of the radiative effects of aerosols.
Our investigations are based on observations by the satellite instrument
SCIAMACHY on ENVISAT (2004–2008) and on model simulations using the
Monte-Carlo radiative transfer model McArtim. In addition to the Ring effect
we investigate the impact of aerosols on the absorptions of the oxygen
molecule (O2) and dimer (O4) as well as the radiance. In general
good consistency between measured and simulated quantities is found. In some
cases also systematic differences occurred, which are probably mainly
related to the strong polarisation sensitivity of the SCIAMACHY instrument.
Our study indicates that Ring effect observations have important advantages
for aerosol retrievals: they can be analysed with high accuracy in various
wavelength ranges; and depending on the wavelength range, they show
different sensitivities on aerosol properties like single scattering albedo,
optical depth or layer height. The results of this study are of particular
interest for future aerosol inversion algorithms for satellite instruments
with reduced polarisation sensitivity and smaller ground pixels, capable of
measuring the Ring effect with higher accuracy. |
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