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| Titel |
Feasibility of polarized all-sky imaging for aerosol characterization |
| VerfasserIn |
A. Kreuter, M. Blumthaler |
| 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 ; 6, no. 7 ; Nr. 6, no. 7 (2013-07-31), S.1845-1854 |
| Datensatznummer |
250017931
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| Publikation (Nr.) |
 copernicus.org/amt-6-1845-2013.pdf |
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| Zusammenfassung |
| In this study, we investigate the method of polarized all-sky imaging with
respect to aerosol characterization. As a technical frame work for image
processing and analysis, we propose Zernike polynomials to decompose the
relative Stokes parameter distributions. This defines a suitable and
efficient feature vector which is also appealing because it is independent
of calibration, circumvents overexposure problems and is robust against
pixel noise. We model the polarized radiances of realistic aerosol scenarios
and construct the feature vector space of the key aerosol types in terms of
the first two principal components describing the maximal variances. We show
that, using this representation, aerosol types can be clearly distinguished
with respect to fine and coarse mode dominated size distribution and index
of refraction. We further investigate the individual influences of varying
aerosol properties and solar zenith angle. This suggests that polarized
all-sky imaging may improve aerosol characterization in combination with sky
scanning radiometers of the existing Aerosol Robotic Network (AERONET)
especially at low aerosol optical depths and low solar zenith angles. |
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