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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-826
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
13 Oct 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
A European aerosol phenomenology-6: Scattering properties of atmospheric aerosol particles from 28 ACTRIS sites
Marco Pandolfi1, Lucas Alados-Arboledas2, Andrés Alastuey1, Marcos Andrade3, Begoña Artiñano4, John Backman5,6, Urs Baltensperger7, Paolo Bonasoni8, Nicolas Bukowiecki7, Martine Collaud Coen9, Sebastian Conil10, Esther Coz4, Vincent Crenn11,12, Vadimas Dudoitis13, Marina Ealo1, Kostas Eleftheriadis14, Olivier Favez15, Prodromos Fetfatzis14, Markus Fiebig16, Harald Flentje17, Patrick Ginot18, Martin Gysel7, Bas Henzing19, Andras Hoffer20, Adela Holubova Smejkalova21,22, Ivo Kalapov23, Nikos Kalivitis24,25, Giorgos Kouvarakis24, Adam Kristensson26, Markku Kulmala5, Heikki Lihavainen6, Chris Lunder16, Krista Luoma5, Hassan Lyamani2, Angela Marinoni8, Nikos Mihalopoulos24,25, Marcel Moerman19, José Nicolas27, Colin O'Dowd28, Tuukka Petäjä5, Jean-Eudes Petit11,15, Jean Marc Pichon27, Nina Prokopciuk13, Jean-Philippe Putaud29, Sergio Rodríguez30, Jean Sciare11,a, Karine Sellegri27, Dimiter B. Stamenov23, Erik Swietlicki26, Gloria Titos1,2, Thomas Tuch31, Peter Tunved32, Vidmantas Ulevicius13, Aditya Vaishya28,33, Milan Vana21,22, Aki Virkkula5, Stergios Vratolis14, Ernest Weingartner7,b, Alfred Wiedensohler31, and Paolo Laj5,8,18 1Institute of Environmental Assessment and Water Research, c/ Jordi-Girona 18-26, 08034, Barcelona, Spain
2Andalusian Institute for Earth System Research, IISTA-CEAMA, University of Granada, Granada 18006, Spain
3Atmospheric Physics Laboratory, ALP, UMSA, Campus Cota Cota calle 27, Endifico FCPN piso 3, La Paz, Bolivia
4Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, Unidad Asociada en Contaminación Atmosférica, CIEMAT-CSIC, Avda. Complutense, 40, 28040 Madrid
5University of Helsinki, UHEL, Division of Atmospheric Sciences, PO BOX 64, FI-00014, Helsinki, Finland
6Finnish Meteorological Institute, FMI, Erik Palmenin aukio 1, FI-00560, Helsinki, Finland
7Paul Scherrer Institut, PSI, Laboratory of Atmospheric Chemistry (LAC), OFLB, , 5232, Villigen PSI, Switzerland
8Institute of Atmospheric Sciences and Climate, ISAC, Via P. Gobetti 101, I-40129, Bologna, Italy
9Federal Office of Meteorology and Climatology, MeteoSwiss, Chemin de l'aérologie, 1530 Payerne, Switzerland
10ANDRA – DRD – Observation Surveillance, Observatoire Pérenne de l'Environnement, Bure, France
11LSCE-Orme point courrier 129 CEA-Orme des Merisiers, 91191 Gif-sur-Yvette, France
12ADDAIR, BP 70207 - 189, rue Audemars, 78530, Buc, France
13SRI Center for Physical Sciences and Technology, CPST, Sauletekio ave. 3, LT-10257, Vilnius, Lithuania
14Institute of Nuclear & Radiological Science & Technology, Energy & Safety, N.C.S.R. “Demokritos”, Athens, 15341, Greece
15Institut National de l’Environnement Industriel et des Risques, Verneuil en Halatte, 60550, France
16Norwegian Institute for Air Research, Atmosphere and Climate Department, NILU, Instituttveien 18, , 2007, Kjeller, Norway
17Deutscher Wetterdienst, Met. Obs. Hohenpeissenberg, DE-82383 Hohenpeissenberg, Germany
18Univ. Grenoble-Alpes, CNRS, IRD, INPG, IGE F-38000 Grenoble, France
19TNO B&O, Princetonlaan 6, 3584TA, The Hague, The Netherlands
20MTA-PE Air Chemistry Research Group, Veszprém, P.O. Box 158, H-8201, Hungary
21Global Change Research Institute AS CR, Belidla 4a, 603 00, Brno, Czech Republic
22Czech Hydrometeorological Institute, Na Sabatce 17 , 143 06, Praha, Czech Republic
23Institute for Nuclear Research and Nuclear Energy, Basic Environmental Observatory Moussala, 72 Tsarigradsko Chaussee Blvd, 1784-Sofia, Bulgaria
24Environmental Chemical Processes Laboratory, Dept. of Chemistry, Univ. of Crete, Heraklion, 71003, Greece
25Institute for Environmental Research & Sustainable Development, National Observatory of Athens (NOA), I. Metaxa & Vas. Pavlou, 15236 Palea Penteli, Greece
26Lund University, Department of Physics, P. O. Box 118, SE-22100, Lund, Sweden
27CNRS-LaMP Université Blaise Pascal 4, Avenue Blaise Pascal 63178 Aubiere Cedex, France
28School of Physics and Centre for Climate & Air Pollution Studies, Ryan Institute, National University of Ireland Galway, University Road, Galway, Ireland
29EC Joint Research Centre, EC-JRC-IES, Institute for Environment and Sustainability, Via Enrico Fermi 2749, 21027, Ispra, Italy
30Agencia Estatal de Meteorologia, AEMET, Izaña Atmospheric Research Center, La Marina 20, E-38071, Santa Cruz de Tenerife, Spain
31Leibniz Institute for Tropospheric Research, (TROPOS), Permoserstraße 15, 04318, Leipzig, Germany
32Department of Environmental Science and Analytical Chemistry (ACES) and the Bolin Centre for Climate Research, Stockholm University, SE-106 91 Stockholm, Sweden
33Space Physics Laboratory, Vikram Sarabhai Space Centre, ISRO, Thiruvananthapuram – 695022, India
anow at: EEWRC, The Cyprus Institute, Nicosia, Cyprus
bnow at: Institute for Aerosol and Sensor Technology, University of Applied Sciences (FHNW), Windisch, Switzerland
Abstract. This paper presents the light scattering properties of atmospheric aerosol particles measured over the past decade at 28 ACTRIS observatories, 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). A large range of ssp was observed across the network. Low ssp values were on average measured in Nordic and Baltic countries and in Western Europe whereas the highest σsp were measured at regional sites in eastern and central Europe. In these regional areas the SAE was also high indicating the predominance of fine-mode particles. On average, the SAE was lower in the Nordic and Baltic, western and southern countries suggesting a lower fraction of fine-mode particle compared to central and eastern Europe. An increasing gradient of ssp was observed when moving from mountain to regional and to urban sites. Conversely, the mass-independent SAE and g parameters did not show the same gradient. At all sites, both SAE and g varied greatly with aerosol particle loading. The lowest values of g were always observed under low ssp indicating a larger contribution from particles in the smaller accumulation mode. Then, g steeply increased with increasing ssp indicating a progressive shift of the particle size distribution toward the larger end of the accumulation mode. Under periods of high particle mass concentrations, the variation of g was less pronounced whereas the SAE increased or decreased suggesting changes mostly in the coarse aerosol particles mode rather than in the fine mode. The station placement seemed to be the main parameter affecting the intra-annual variability. At mountain sites, higher σsp was measured in summer mainly because of the enhanced boundary layer influence. Conversely, less horizontal and vertical dispersion in winter led to higher σsp at all low altitude sites in central and eastern Europe compared to summer. On average, these sites also showed SAE maxima in summer (and correspondingly g minima). Large intra-annual variability of SAE and g was observed also at Nordic and Baltic countries due to seasonal-dependent transport of different air masses to these remote sites. Statistically significant decreasing trends of σsp were observed at 5 out of 13 stations included in trend analyses. The total reductions of ssp were consistent with those reported for PM2.5 and PM10 mass concentrations over similar periods across Europe.

Citation: Pandolfi, M., Alados-Arboledas, L., Alastuey, A., Andrade, M., Artiñano, B., Backman, J., Baltensperger, U., Bonasoni, P., Bukowiecki, N., Collaud Coen, M., Conil, S., Coz, E., Crenn, V., Dudoitis, V., Ealo, M., Eleftheriadis, K., Favez, O., Fetfatzis, P., Fiebig, M., Flentje, H., Ginot, P., Gysel, M., Henzing, B., Hoffer, A., Holubova Smejkalova, A., Kalapov, I., Kalivitis, N., Kouvarakis, G., Kristensson, A., Kulmala, M., Lihavainen, H., Lunder, C., Luoma, K., Lyamani, H., Marinoni, A., Mihalopoulos, N., Moerman, M., Nicolas, J., O'Dowd, C., Petäjä, T., Petit, J.-E., Pichon, J. M., Prokopciuk, N., Putaud, J.-P., Rodríguez, S., Sciare, J., Sellegri, K., Stamenov, D. B., Swietlicki, E., Titos, G., Tuch, T., Tunved, P., Ulevicius, V., Vaishya, A., Vana, M., Virkkula, A., Vratolis, S., Weingartner, E., Wiedensohler, A., and Laj, P.: A European aerosol phenomenology-6: Scattering properties of atmospheric aerosol particles from 28 ACTRIS sites, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-826, in review, 2017.
Marco Pandolfi et al.
Marco Pandolfi et al.
Marco Pandolfi et al.

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Short summary
This investigation presents the variability of near-surface in-situ aerosol particle light scattering measurements obtained over the past decade at 28 measuring atmospheric observatories which are part of the ACTRIS Research Infrastructure and most of them belong to the GAW network. This manuscript provides a comprehensive picture of the spatial and temporal variability of aerosol particles optical properties in Europe.
This investigation presents the variability of near-surface in-situ aerosol particle light...
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