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| Titel |
Aerosol characterization at the Saharan AERONET site Tamanrasset |
| VerfasserIn |
C. Guirado, E. Cuevas, V. E. Cachorro, C. Toledano, S. Alonso-Pérez, J. J. Bustos, S. Basart, P. M. Romero, C. Camino, M. Mimouni, L. Zeudmi, P. Goloub, J. M. Baldasano, A. M. de Frutos |
| 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. 21 ; Nr. 14, no. 21 (2014-11-11), S.11753-11773 |
| Datensatznummer |
250119146
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| Publikation (Nr.) |
 copernicus.org/acp-14-11753-2014.pdf |
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| Zusammenfassung |
| More than 2 years of columnar atmospheric aerosol measurements (2006–2009)
at the Tamanrasset site (22.79° N, 5.53° E, 1377 m a.s.l.),
in the heart of the Sahara, are analysed. Aerosol Robotic Network
(AERONET) level 2.0 data were used. The KCICLO (K is the name of a constant and
ciclo means cycle in Spanish) method was applied to a part
of the level 1.5 data series to improve the quality of the results. The
annual variability of aerosol optical depth (AOD) and Ångström exponent (AE)
has been found to be strongly linked to the convective boundary layer (CBL)
thermodynamic features. The dry-cool season (autumn and winter) is
characterized by a shallow CBL and very low mean turbidity
(AOD ~ 0.09 at 440 nm, AE ~ 0.62). The wet-hot
season (spring and summer) is dominated by high turbidity of coarse
dust particles (AE ~ 0.28, AOD ~ 0.39 at 440 nm)
and a deep CBL. The aerosol-type characterization shows desert mineral dust
as the prevailing aerosol. Both pure Saharan dust and very clear sky conditions
are observed depending on the season. However, several case studies indicate
an anthropogenic fine mode contribution from the industrial areas in Libya
and Algeria. The concentration weighted trajectory (CWT) source
apportionment method was used to identify potential sources of air masses
arriving at Tamanrasset at several heights for each season. Microphysical
and optical properties and precipitable water vapour were also investigated. |
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