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| Titel |
Evaluation of the new ESR network software for the retrieval of direct sun products from CIMEL CE318 and PREDE POM01 sun-sky radiometers |
| VerfasserIn |
V. Estellés, M. Campanelli, T. J. Smyth, M. P. Utrillas, J. A. Martínez-Lozano |
| 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 ; 12, no. 23 ; Nr. 12, no. 23 (2012-12-05), S.11619-11630 |
| Datensatznummer |
250011650
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| Publikation (Nr.) |
 copernicus.org/acp-12-11619-2012.pdf |
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| Zusammenfassung |
| The European Skynet Radiometers network (EuroSkyRad or ESR) has been
recently established as a research network of European PREDE sun-sky
radiometers. Moreover, ESR is federated with SKYNET, an international network
of PREDE sun-sky radiometers mostly present in East Asia. In contrast to
SKYNET, the European network also integrates users of the CIMEL CE318 sky–sun
photometer. Keeping instrumental duality in mind, a set of open source
algorithms has been developed consisting of two modules for (1) the
retrieval of direct sun products (aerosol optical depth, wavelength exponent
and water vapor) from the sun extinction measurements; and (2) the inversion
of the sky radiance to derive other aerosol optical properties such as size
distribution, single scattering albedo or refractive index. In this study we
evaluate the ESR direct sun products in comparison with the AERosol RObotic
NETwork (AERONET) products. Specifically, we have applied the ESR algorithm
to a CIMEL CE318 and PREDE POM simultaneously for a 4-yr database measured
at the Burjassot site (Valencia, Spain), and compared the resultant products
with the AERONET direct sun measurements obtained with the same CIMEL CE318
sky–sun photometer. The comparison shows that aerosol optical depth
differences are mostly within the nominal uncertainty of 0.003 for a standard
calibration instrument, and fall within the nominal AERONET uncertainty of
0.01–0.02 for a field instrument in the spectral range 340 to
1020 nm. In the cases of the Ångström exponent and the columnar
water vapor, the differences are lower than 0.02 and 0.15 cm,
respectively. Therefore, we present an open source code program that can be
used with both CIMEL and PREDE sky radiometers and whose results are
equivalent to AERONET and SKYNET retrievals. |
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