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| Titel |
Lidar profiling of aerosol optical properties from Paris to Lake Baikal (Siberia) |
| VerfasserIn |
E. Dieudonné, P. Chazette, F. Marnas, J. Totems, X. Shang |
| 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 ; 15, no. 9 ; Nr. 15, no. 9 (2015-05-04), S.5007-5026 |
| Datensatznummer |
250119692
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| Publikation (Nr.) |
 copernicus.org/acp-15-5007-2015.pdf |
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| Zusammenfassung |
| In June 2013, a ground-based mobile lidar performed the ~10 000 km
ride from Paris to Ulan-Ude, near Lake Baikal, profiling for the first time
aerosol optical properties all the way from western Europe to central
Siberia. The instrument was equipped with N2-Raman and depolarization
channels that enabled an optical speciation of aerosols in the low and middle
troposphere. The extinction-to-backscatter ratio (also called lidar ratio or
LR) and particle depolarization ratio (PDR) at 355 nm have been retrieved.
The LR in the lower boundary layer (300–700 m) was found to be
63 ± 17 sr on average during the campaign with a distribution slightly
skewed toward higher values that peaks between 50 and 55 sr. Although the
difference is small, PDR values observed in Russian cities (>2%,
except after rain) are systematically higher than the ones measured in Europe
(<1%), which is probably an effect of the lifting of terrigenous
aerosols by traffic on roads. Biomass burning layers from grassland or/and
forest fires in southern Russia exhibit LR values ranging from 65 to 107 sr
and from 3 to 4% for the PDR. During the route, desert dust aerosols
originating from the Caspian and Aral seas regions were characterized for the
first time, with a LR (PDR) of 43 ± 14 sr (23 ± 2%) for
pure dust. The lidar observations also showed that this dust event extended
over 2300 km and lasted for ~6 days. Measurements from the Moderate
Resolution Imaging Spectrometer (MODIS) show that our results are comparable
in terms of aerosol optical thickness (between 0.05 and 0.40 at 355 nm) with
the mean aerosol load encountered throughout our route. |
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