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    Long-term observations of the background aerosol at Cabauw, The Netherlands.

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    Authors
    Mamali, D
    Mikkilä, J
    Henzing, B
    Spoor, R
    Ehn, M
    Petäjä, T
    Russchenberg, H
    Biskos, G
    Type
    Article
    Language
    en
    
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    Title
    Long-term observations of the background aerosol at Cabauw, The Netherlands.
    Published in
    Sci Total Environ 2018; 625:752-61
    Publiekssamenvatting
    Long-term measurements of PM2.5 mass concentrations and aerosol particle size distributions from 2008 to 2015, as well as hygroscopicity measurements conducted over one year (2008-2009) at Cabauw, The Netherlands, are compiled here in order to provide a comprehensive dataset for understanding the trends and annual variabilities of the atmospheric aerosol in the region. PM2.5 concentrations have a mean value of 14.4μgm-3 with standard deviation 2.1μgm-3, and exhibit an overall decreasing trend of -0.74μgm-3year-1. The highest values are observed in winter and spring and are associated with a shallower boundary layer and lower precipitation, respectively, compared to the rest of the seasons. Number concentrations of particles smaller than 500nm have a mean of 9.2×103particles cm-3 and standard deviation 4.9×103particles cm-3, exhibiting an increasing trend between 2008 and 2011 and a decreasing trend from 2013 to 2015. The particle number concentrations exhibit highest values in spring and summer (despite the increased precipitation) due to the high occurrence of nucleation-mode particles, which most likely are formed elsewhere and are transported to the observation station. Particle hygroscopicity measurements show that, independently of the air mass origin, the particles are mostly externally mixed with the more hydrophobic mode having a mean hygroscopic parameter κ of 0.1 while for the more hydrophilic mode κ is 0.35. The hygroscopicity of the smaller particles investigated in this work (i.e., particles having diameters of 35nm) appears to increase during the course of the nucleation events, reflecting a change in the chemical composition of the particles.
    DOI
    10.1016/j.scitotenv.2017.12.136
    PMID
    29306164
    URI
    http://hdl.handle.net/10029/621171
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.scitotenv.2017.12.136
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