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| Titel |
Hygroscopic growth of atmospheric aerosol particles based on active remote sensing and radiosounding measurements: selected cases in southeastern Spain |
| VerfasserIn |
M. J. Granados-Muñoz, F. Navas-Guzmán, J. A. Bravo-Aranda, J. L. Guerrero-Rascado, H. Lyamani, A. Valenzuela, G. Titos, J. Fernández-Gálvez, L. Alados-Arboledas |
| 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 ; 8, no. 2 ; Nr. 8, no. 2 (2015-02-10), S.705-718 |
| Datensatznummer |
250116129
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| Publikation (Nr.) |
 copernicus.org/amt-8-705-2015.pdf |
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| Zusammenfassung |
| A new methodology based on combining active and passive remote sensing and
simultaneous and collocated radiosounding data to study the aerosol
hygroscopic growth effects on the particle optical and microphysical
properties is presented. The identification of hygroscopic growth situations
combines the analysis of multispectral aerosol particle backscatter
coefficient and particle linear depolarization ratio with thermodynamic
profiling of the atmospheric column. We analyzed the hygroscopic growth
effects on aerosol properties, namely the aerosol particle backscatter
coefficient and the volume concentration profiles, using data gathered at
Granada EARLINET station. Two study cases, corresponding to different
aerosol loads and different aerosol types, are used for illustrating the
potential of this methodology. Values of the aerosol particle backscatter
coefficient enhancement factors range from 2.1 ± 0.8 to 3.9 ± 1.5, in the ranges of relative humidity 60–90 and 40–83%, being
similar to those previously reported in the literature. Differences in the
enhancement factor are directly linked to the composition of the atmospheric
aerosol. The largest value of the aerosol particle backscatter coefficient
enhancement factor corresponds to the presence of sulphate and marine
particles that are more affected by hygroscopic growth. On the contrary, the
lowest value of the enhancement factor corresponds to an aerosol mixture
containing sulphates and slight traces of mineral dust. The Hänel
parameterization is applied to these case studies, obtaining results within
the range of values reported in previous studies, with values of the γ
exponent of 0.56 ± 0.01 (for anthropogenic particles slightly
influenced by mineral dust) and 1.07 ± 0.01 (for the situation
dominated by anthropogenic particles), showing the convenience of this
remote sensing approach for the study of hygroscopic effects of the
atmospheric aerosol under ambient unperturbed conditions. For the first
time, the retrieval of the volume concentration profiles for these cases
using the Lidar Radiometer Inversion Code (LIRIC) allows us to analyze the
aerosol hygroscopic growth effects on aerosol volume concentration,
observing a stronger increase of the fine mode volume concentration with
increasing relative humidity. |
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