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| Titel |
Integration of measurements and model simulations to characterize Eyjafjallajökull volcanic aerosols over south-eastern Italy |
| VerfasserIn |
M. R. Perrone, F. Tomasi, A. Stohl, N. I. Kristiansen |
| 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. 20 ; Nr. 12, no. 20 (2012-10-30), S.10001-10013 |
| Datensatznummer |
250011548
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| Publikation (Nr.) |
 copernicus.org/acp-12-10001-2012.pdf |
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| Zusammenfassung |
| Volcanic aerosols resulting from the Eyjafjallajökull eruption were
detected in south-eastern Italy from 20 to 22 April 2010, at a distance of
approximately 4000 km from the volcano, and have been characterized by
lidar, sun/sky photometer, and surface in-situ measurements. Volcanic particles
added to the pre-existing aerosol load and measurement data allow
quantifying the impact of volcanic particles on the aerosol vertical
distribution, lidar ratios, the aerosol size distribution, and the
ground-level particulate-matter concentrations. Lidar measurements reveal
that backscatter coefficients by volcanic particles were about one order of
magnitude smaller over south-eastern Italy than over Central Europe. Mean
lidar ratios at 355 nm were equal to 64 ± 5 sr inside the volcanic
aerosol layer and were characterized by smaller values (47 ± 2 sr) in the
underlying layer on 20 April, 19:30 UTC. Lidar ratios and their dependence
with the height reduced in the following days, mainly because of the
variability of the volcanic particle contributions. Size distributions from
sun/sky photometer measurements reveal the presence of volcanic particles
with radii r > 0.5 μm on 21 April and that the contribution of
coarse volcanic particles increased from 20 to 22 April. The aerosol
fine mode fraction from sun/sky photometer measurements varied between
values of 0.85 and 0.94 on 20 April and decreased to values between 0.25 and
0.82 on 22 April. Surface measurements of particle size distributions were
in good accordance with column averaged particle size distributions from
sun/sky photometer measurements. PM1/PM2.5 mass concentration ratios of
0.69, 0.66, and 0.60 on 20, 21, and 22 April, respectively, support the
increase of super-micron particles at ground. Measurements from the Regional
Air Quality Agency show that PM10 mass concentrations on 20, 21, and 22
April 2010 were enhanced in the entire Apulia Region. More specifically,
PM10 mass concentrations have on average increased over Apulia Region
22%, 50%, and 28% on 20, 21, and 22 April, respectively, compared
to values on 19 April. Finally, the comparison of measurement data with
numerical simulations by the FLEXPART dispersion model demonstrates the
ability of FLEXPART to model the advection of the volcanic ash over the 4000 km
from the Eyjafjallajökull volcano to Southern Italy. |
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