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| Titel |
Column-integrated aerosol microphysical properties from AERONET Sun photometer over southwestern Spain |
| VerfasserIn |
N. Prats, V. E. Cachorro, A. Berjón, C. Toledano, A. M. 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 ; 11, no. 24 ; Nr. 11, no. 24 (2011-12-15), S.12535-12547 |
| Datensatznummer |
250010263
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| Publikation (Nr.) |
 copernicus.org/acp-11-12535-2011.pdf |
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| Zusammenfassung |
The aim of the present work is to carry out a detailed analysis of columnar
microphysical properties obtained from Cimel sun-photometer measurements in
the Southwest of Spain within the frame of the Aerosol Robotic Network
(AERONET) – Iberian Network for aerosol measurements (RIMA). AERONET level 2
inversion products are analysed, in particular the particle size
distribution together with their associated microphysical parameters for
both fine and coarse modes: volume concentration, effective radius and the
fine mode volume fraction. This work complements previous works based on
aerosol optical depth (AOD) and the Ångström exponent (AE) for a
global characterization of atmospheric aerosol in this area of southwestern
Spain.
The analysed dataset spans between February 2000 and October 2008. Time
series and statistical analysis has been carried out for these parameters in
order to assess their typical values and seasonality together with their
relationships with the AOD and AE. Mean values of volume particle
concentration are 0.06±0.07 μm3 μm−2 for total,
0.019±0.015 μm3 μm−2 for fine and 0.04±0.06
μm3 μm−2 for coarse mode; mean effective radii are
0.40±0.19 μm for total, 0.14±0.02 μm for fine and
1.96±0.41 μm for coarse mode.
The most relevant features are the clear bimodality of the volume particle
size distribution, with a slight dominance of the coarse mode in the overall
climatology given the prevailing atmospheric conditions at the site (coastal
marine). There is a clear prevalence of the coarse mode in summer months
plus September and March, in coincidence with the occurrence of desert dust
intrusions and highest AOD values. During desert dust outbreaks, the
particle size distribution is practically monomodal with strong prevalence
of the coarse mode which also shows a shift of the modal radius toward lower
values.
The size particle predominance defines the characteristic of the site and it
has been analysed under two different parameters: the Ångström
exponent and the fine mode volume fraction Vf/Vt. We investigated the
relationship between them and also their relationship with the effective
radius of the size distribution. |
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