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| Titel |
Multi-wavelength Raman lidar, sun photometric and aircraft measurements in combination with inversion models for the estimation of the aerosol optical and physico-chemical properties over Athens, Greece |
| VerfasserIn |
R. E. Mamouri, A. Papayannis, V. Amiridis, D. Müller, P. Kokkalis, S. Rapsomanikis, E. T. Karageorgos, G. Tsaknakis, A. Nenes, S. Kazadzis, E. Remoundaki |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 5, no. 7 ; Nr. 5, no. 7 (2012-07-25), S.1793-1808 |
| Datensatznummer |
250003016
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| Publikation (Nr.) |
 copernicus.org/amt-5-1793-2012.pdf |
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| Zusammenfassung |
| A novel procedure has been developed to retrieve, simultaneously, the
optical, microphysical and chemical properties of tropospheric aerosols with
a multi-wavelength Raman lidar system in the troposphere over an urban site
(Athens, Greece: 37.9° N, 23.6° E, 200 m a.s.l.) using data obtained
during the European Space Agency (ESA) THERMOPOLIS project, which took place
between 15–31 July 2009 over the Greater Athens Area (GAA). We selected to
apply our procedure for a case study of intense aerosol layers that occurred on
20–21 July 2009. The National Technical University of Athens (NTUA) EOLE
6-wavelength Raman lidar system has been used to provide the vertical
profiles of the optical properties of aerosols (extinction and backscatter
coefficients, lidar ratio) and the water vapor mixing ratio. An inversion
algorithm was used to derive the mean aerosol microphysical properties (mean
effective radius (reff), single-scattering albedo ω) and mean complex
refractive index (m)) at selected heights in the 2–3 km height region. We
found that reff was 0.14–0.4 (±0.14) μm, ω was 0.63–0.88 (±0.08)
(at 532 nm) and m ranged from 1.44 (±0.10) + 0.01 (±0.01)i to
1.55 (±0.12) + 0.06 (±0.02)i, in good agreement (only for the reff
values) with in situ aircraft measurements. The water vapor and temperature
profiles were incorporated into the ISORROPIA II model to propose a possible
in situ aerosol composition consistent with the retrieved m and ω values. The
retrieved aerosol chemical composition in the 2–3 km height region gave a
variable range of sulfate (0–60%) and organic carbon (OC) content
(0–50%), although the OC content increased (up to 50%) and the sulfate
content dropped (up to 30%) around 3 km height; the retrieved low
ω value (0.63), indicates the presence of absorbing biomass burning smoke
mixed with urban haze. Finally, the retrieved aerosol microphysical
properties were compared with column-integrated sun photometer CIMEL data. |
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