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| Titel |
Aerosol microphysical retrievals from precision filter radiometer direct solar radiation measurements and comparison with AERONET |
| VerfasserIn |
S. Kazadzis, I. Veselovskii, V. Amiridis, J. Gröbner, A. Suvorina, S. Nyeki, E. Gerasopoulos, N. Kouremeti, M. Taylor, A. Tsekeri, C. Wehrli |
| 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 ; 7, no. 7 ; Nr. 7, no. 7 (2014-07-04), S.2013-2025 |
| Datensatznummer |
250115840
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| Publikation (Nr.) |
 copernicus.org/amt-7-2013-2014.pdf |
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| Zusammenfassung |
Synchronized sun-photometric measurements from the AERONET-CIMEL (AErosol
RObotic NETwork) and GAW-PFR (Global Atmospheric Watch–Precision Filter Radiometer)
aerosol networks are used to compare retrievals of the aerosol optical
depth (AOD), effective radius, and volume concentration during a high-temporal-resolution
measurement campaign at the Athens site in the Mediterranean
Basin from 14 to 22 July 2009. During this period, direct-sun AOD retrievals
from both instruments exhibited small differences in the range 0.01–0.02.
The AODs measured with CIMEL and PFR instruments were inverted to retrieve
particle microphysical properties using the linear estimation (LE) technique. For
low aerosol loads (AOD < 0.2), measurements of the effective radius
by the PFR were found to be −20% to +30% different from CIMEL values
for both direct-sun data and inversion data. At higher loads
(AOD > 0.4), measurements of the effective radius by the PFR are
consistently 20 % lower than CIMEL for both direct-sun and inversion data.
Volume concentrations at low aerosol loads from the PFR are up to 80%
higher than the CIMEL for direct-sun data but are up to 20% lower when
derived from inversion data under these same conditions. At higher loads,
the percentage difference in volume concentrations from the PFR and CIMEL is
systematically negative, with inversion data predicting differences 30%
lower than those obtained from direct-sun data.
An assessment of the effect of errors in the AOD retrieval on the estimation
of PFR bulk parameters was performed and demonstrates that it is possible to
estimate the particle volume concentration and effective radius with an
uncertainty < 65% when AOD < 0.2 and when input errors are
as high as 10%. |
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