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| Titel |
Number size distributions and seasonality of submicron particles in Europe 2008–2009 |
| VerfasserIn |
A. Asmi, A. Wiedensohler, P. Laj, A.-M. Fjaeraa, K. Sellegri, W. Birmili, E. Weingärtner, U. Baltensperger, V. Ždímal, N. Zikova, J.-P. Putaud, A. Marinoni, P. Tunved, H.-C. Hansson, M. Fiebig, N. Kivekäs, H. Lihavainen, E. Asmi, V. Ulevicius, P. P. Aalto, E. Swietlicki, A. Kristensson, N. Mihalopoulos, N. Kalivitis, I. Kalapov, G. Kiss, G. Leeuw, B. Henzing, R. M. Harrison, D. Beddows, C. O'Dowd, S. G. Jennings, H. Flentje, K. Weinhold, F. Meinhardt, L. Ries, M. Kulmala  |
| 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. 11 ; Nr. 11, no. 11 (2011-06-15), S.5505-5538 |
| Datensatznummer |
250009816
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| Publikation (Nr.) |
 copernicus.org/acp-11-5505-2011.pdf |
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| Zusammenfassung |
Two years of harmonized aerosol number size distribution data from 24
European field monitoring sites have been analysed. The results give a
comprehensive overview of the European near surface aerosol particle number
concentrations and number size distributions between 30 and 500 nm of
dry particle diameter. Spatial and temporal distribution of aerosols in the
particle sizes most important for climate applications are presented. We also
analyse the annual, weekly and diurnal cycles of the aerosol number
concentrations, provide log-normal fitting parameters for median number size
distributions, and give guidance notes for data users. Emphasis is placed on
the usability of results within the aerosol modelling community.
We also show that the aerosol number concentrations of Aitken and
accumulation mode particles (with 100 nm dry diameter as a cut-off
between modes) are related, although there is significant variation in the
ratios of the modal number concentrations. Different aerosol and station
types are distinguished from this data and this methodology has potential for
further categorization of stations aerosol number size distribution types.
The European submicron aerosol was divided into characteristic types: Central
European aerosol, characterized by single mode median size distributions,
unimodal number concentration histograms and low variability in CCN-sized
aerosol number concentrations; Nordic aerosol with low number concentrations,
although showing pronounced seasonal variation of especially Aitken mode
particles; Mountain sites (altitude over 1000 m a.s.l.) with a strong
seasonal cycle in aerosol number concentrations, high variability, and very
low median number concentrations. Southern and Western European regions had
fewer stations, which decreases the regional coverage of these results.
Aerosol number concentrations over the Britain and Ireland had very high
variance and there are indications of mixed air masses from several source
regions; the Mediterranean aerosol exhibit high seasonality, and a strong
accumulation mode in the summer. The greatest concentrations were observed at
the Ispra station in Northern Italy with high accumulation mode number
concentrations in the winter. The aerosol number concentrations at the Arctic
station Zeppelin in Ny-\AA lesund in Svalbard have also a strong seasonal
cycle, with greater concentrations of accumulation mode particles in winter,
and dominating summer Aitken mode indicating more recently formed particles.
Observed particles did not show any statistically significant regional
work-week or weekday related variation in number concentrations studied.
Analysis products are made for open-access to the research community,
available in a freely accessible internet site. The results give to the
modelling community a reliable, easy-to-use and freely available comparison
dataset of aerosol size distributions. |
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