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| Titel |
Nine years of UV aerosol optical depth measurements at Thessaloniki, Greece |
| VerfasserIn |
S. Kazadzis, A. Bais, V. Amiridis, D. Balis, C. Meleti, N. Kouremeti, C. S. Zerefos, S. Rapsomanikis, M. Petrakakis, A. Kelesis, P. Tzoumaka, K. Kelektsoglou |
| 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 ; 7, no. 8 ; Nr. 7, no. 8 (2007-04-26), S.2091-2101 |
| Datensatznummer |
250004918
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| Publikation (Nr.) |
 copernicus.org/acp-7-2091-2007.pdf |
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| Zusammenfassung |
| Spectral measurements of the aerosol optical depth (AOD) and the
Ångström coefficient were conducted at Thessaloniki, Greece
(40.5° N, 22.9° E) between January 1997 and December 2005 with a
Brewer MKIII double-monochromator spectroradiometer. The dataset was
compared with collocated measurements of a second spectroradiometer (Brewer
MKII) and a CIMEL sun-photometer, showing correlations of 0.93 and 0.98,
respectively. A seasonal variation of the AOD was observed at Thessaloniki,
with AOD values at 340 nm of 0.52 and 0.28 for August and December
respectively. Back trajectories of air masses for up to 4 days were used to
assess the influence of long-range transport from various regions to the
aerosol load over Thessaloniki. It is shown that part of the observed
seasonality can be attributed to air masses with high AOD originating from
North-Eastern and Eastern directions during summertime. The analysis of the
long-term record (9 years) of AOD showed a downward tendency. A similar
decreasing tendency was found in the record of the PM$_{10}$ aerosol
measurements, which are conducted near the surface at 4 air-quality
monitoring stations in the area of the city of Thessaloniki. |
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