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| Titel |
Advection patterns and aerosol optical and microphysical properties by AERONET over south-east Italy in the central Mediterranean |
| VerfasserIn |
M. Santese, F. Tomasi, M. R. Perrone |
| 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 ; 8, no. 7 ; Nr. 8, no. 7 (2008-03-31), S.1881-1896 |
| Datensatznummer |
250006023
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| Publikation (Nr.) |
 copernicus.org/acp-8-1881-2008.pdf |
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| Zusammenfassung |
| Aerosol products by AERONET sun-sky radiometer measurements combined with
air-mass backtrajectories were analyzed to identify source regions and
pathways of air masses carrying aerosols to south-east Italy, and to
determine the dependence of aerosol mean optical properties on advection
patterns. Aerosol optical depth (AOD), fine mode fraction (η ), single
scattering albedo (SSA), asymmetry factor (g), and lidar ratio (Lr) at 440 nm
were used to characterize aerosol properties. The analysis of
5-day-backtrajectories ending in Lecce on south-east Italy and referring to
240 measurement days of the 2003–2004 years revealed that 32% of the
measurement days were characterized by air masses coming from all
continental European sources with the exception of Spain. 3% of the
measurement days were characterized by air masses coming from both the
Southern Mediterranean Sea and the Africa continent, and the Western
Mediterranean, the Iberian Peninsula, and the Atlantic Ocean. 62% of the
measurement days were characterized by mixed advection patterns. We found
that AOD, SSA and g average values were not significantly dependent on air
mass source regions. In contrast, η and Lr average values were quite
affected by the air mass source region. AOD, &eta, SSA, g, and Lr average
values, which were equal to 0.29±0.15, 0.93±0.03, 0.93±0.03,
0.67±0.03, and 72±20 sr, respectively indicated that the aerosol
advected from all continental European sources with the exception of Spain,
could be considered representative of "continental average aerosol",
mostly made of water soluble and a small amount of soot and insoluble
components. Polluted-desert dust particles characterized by AOD=0.29±0.05,
η=0.72±0.05, SSA=0.94±0.03, g=0.69±0.02, Lr=56±13 sr,
were advected over south-east Italy from the Southern
Mediterranean Sea and the Africa continent. The Western Mediterranean, the
Iberian Peninsula, and the Atlantic Ocean were instead responsible of the
advection of maritime-polluted particles, which were characterized by
AOD=0.27±0.17, η=0.8±0.1, SSA=0.94±0.03, g=0.67±0.03,
Lr=58±24 sr. Hence, we found that the aerosol load over
south-east Italy was dominated by moderately-absorbing, fine-mode particles
even if it was also affected by the minor contribution of desert and
maritime type aerosol. The application of an aerosol mask to the data points
retrieved on measurement days characterized by mixed advection patterns,
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