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A European aerosol phenomenology – 6: scattering properties of atmospheric aerosol particles from 28 ACTRIS sites

Marco Pandolfi 1 Lucas Alados-Arboledas 2 Andres Alastuey 1 Marcos Andrade 3 Christo Angelov 4 Begona Artinano 5 John Backman 6, 7 Urs Baltensperger 8 Paolo Bonasoni 9 Nicolas Bukowiecki 8 Martine Collaud Coen 10 Sébastien Conil 11 Esther Coz 5 Vincent Crenn 12, 13 Vadimas Dudoitis 14 Marina Ealo 1 Kostas Eleftheriadis 15 Olivier Favez 16 Prodromos Fetfatzis 15 Markus Fiebig 17 Harald Flentje Patrick Ginot 18 Martin Gysel Bas Henzing 19 Andras Hoffer Adela Holubova Smejkalova Ivo Kalapov 4 Nikos Kalivitis 20, 21 Giorgos Kouvarakis 20 Adam Kristensson 22 Markku Kulmala 6 Heikki Lihavainen 7 Chris Lunder 17 Krista Luoma 6 Hassan Lyamani 2 Angela Marinoni 9 Nikos Mihalopoulos 20, 21 Marcel Moerman 19 Jose B. Nicolas 23 Colin O’dowd Tuukka Petaja 6 Jean-Eudes Petit 16, 12 Jean Marc Pichon 23 Nina Prokopciuk 14 Jean-Philippe Putaud 24 Sergio Rodríguez Jean Sciare 12 Karine Sellegri 23 Erik Swietlicki 22 Gloria Titos 2 Thomas Tuch 25 Peter Tunved Vidmantas Ulevicius 14 Aditya Vaishya 26 Milan Vana Aki Virkkula 6 Stergios Vratolis 15 Ernest Weingartner 8 Alfred Wiedensohler 3 Paolo Laj 6, 9, 18
Abstract : This paper presents the light-scattering properties of atmospheric aerosol particles measured over the past decade at 28 ACTRIS observatories, which are located mainly in Europe. The data include particle light scattering (σsp) and hemispheric backscattering (σbsp) coefficients, scattering Ångström exponent (SAE), backscatter fraction (BF) and asymmetry parameter (g). An increasing gradient of σsp is observed when moving from remote environments (arctic/mountain) to regional and to urban environments. At a regional level in Europe, σsp also increases when moving from Nordic and Baltic countries and from western Europe to central/eastern Europe, whereas no clear spatial gradient is observed for other station environments. The SAE does not show a clear gradient as a function of the placement of the station. However, a west-to-east-increasing gradient is observed for both regional and mountain placements, suggesting a lower fraction of fine-mode particle in western/south-western Europe compared to central and eastern Europe, where the fine-mode particles dominate the scattering. The g does not show any clear gradient by station placement or geographical location reflecting the complex relationship of this parameter with the physical properties of the aerosol particles. Both the station placement and the geographical location are important factors affecting the intra-annual variability. At mountain sites, higher σsp and SAE values are measured in the summer due to the enhanced boundary layer influence and/or new particle-formation episodes. Conversely, the lower horizontal and vertical dispersion during winter leads to higher σsp values at all low-altitude sites in central and eastern Europe compared to summer. These sites also show SAE maxima in the summer (with corresponding g minima). At all sites, both SAE and g show a strong variation with aerosol particle loading. The lowest values of g are always observed together with low σsp values, indicating a larger contribution from particles in the smaller accumulation mode. During periods of high σsp values, the variation of g is less pronounced, whereas the SAE increases or decreases, suggesting changes mostly in the coarse aerosol particle mode rather than in the fine mode. Statistically significant decreasing trends of σsp are observed at 5 out of the 13 stations included in the trend analyses. The total reductions of σsp are consistent with those reported for PM2.5 and PM10 mass concentrations over similar periods across Europe.
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Marco Pandolfi, Lucas Alados-Arboledas, Andres Alastuey, Marcos Andrade, Christo Angelov, et al.. A European aerosol phenomenology – 6: scattering properties of atmospheric aerosol particles from 28 ACTRIS sites. Atmospheric Chemistry and Physics, European Geosciences Union, 2018, 18, pp.8727-8744. ⟨10.5194/acp-18-7877-2018⟩. ⟨ineris-01863464⟩

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