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| Titel |
Injection of mineral dust into the free troposphere during fire events observed with polarization lidar at Limassol, Cyprus |
| VerfasserIn |
A. Nisantzi, R. E. Mamouri, A. Ansmann, D. Hadjimitsis |
| 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 ; 14, no. 22 ; Nr. 14, no. 22 (2014-11-19), S.12155-12165 |
| Datensatznummer |
250119171
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| Publikation (Nr.) |
 copernicus.org/acp-14-12155-2014.pdf |
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| Zusammenfassung |
| Four-year observations (2010–2014) with EARLINET polarization lidar
and AERONET sun/sky photometer at Limassol (34.7° N,
33° E), Cyprus, were used to study the soil dust content in
lofted fire smoke plumes advected from Turkey. This first systematic
attempt to characterize less than 3-day-old smoke plumes in terms
of particle linear depolarization ratio (PDR), measured with lidar, contributes to the more general effort to
properly describe the life cycle of free-tropospheric smoke–dust
mixtures from the emission event to phases of long-range transport
(> 4 days after emission). We found significant PDR differences
with values from 9 to 18%
in lofted aerosol layers when Turkish fires contributed to the
aerosol burden and of 3–13 % when Turkish fires were absent.
High Ångström exponents of 1.4–2.2 during all these events
with lofted smoke layers, occurring between 1 and 3 km
height, suggest the absence of a pronounced particle coarse mode.
When plotted vs. travel time (spatial distance between Limassol
and last fire area), PDR decreased strongly from initial values
around 16–18% (1 day travel) to 4–8% after 4 days of
travel caused by deposition processes. This behavior was found to be
in close agreement with findings described in the literature. Computation of particle
extinction coefficient and mass concentrations, derived from the lidar observations, separately for
fine-mode dust, coarse-mode dust, and non-dust aerosol components
show extinction-related dust fractions on the order of 10% (for
PDR =4%, travel times > 4 days) and 50%
(PDR =15%, 1 day travel time) and respective mass-related dust
fractions of 25% (PDR =4%) to 80%
(PDR =15%). Biomass burning should therefore be considered as
another source of free tropospheric soil dust. |
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