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New particle formation at a remote site in the eastern Mediterranean
University of Patras.
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2012 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 117, D12205- p.Article in journal (Refereed) Published
Abstract [en]

A year (6-April-2008 to 14-April-2009) of particulate monitoring was conducted at a remote coastal station on the island of Crete, Greece in the eastern Mediterranean. Fifty-eight regional new particle formation events were observed with an Air Ion Spectrometer (AIS), half of which occurred during the coldest months of the year (December-March). Particle formation was favored by air masses arriving from the west that crossed Crete or southern Greece prior to reaching the site and also by lower-than-average condensational sinks (CS). Aerosol composition data, which were acquired during month-long campaigns in the summer and winter, suggest that nucleation events occurred only when particles were neutral. This is consistent with the hypothesis that a lack of NH3, during periods when particles are acidic, may limit nucleation in sulfate-rich environments. Nucleation was not limited by the availability of SO2 alone, as nucleation events often did not take place during periods with high SO2 or H2SO4 concentrations. The above results support the hypothesis that an additional reactant (other than H2SO4) plays an important role in the formation and/or growth of new particles. Our results are consistent with NH3 being this missing reactant.

Place, publisher, year, edition, pages
2012. Vol. 117, D12205- p.
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:su:diva-92096DOI: 10.1029/2012JD017570ISI: 000305628700003OAI: diva2:637283
Available from: 2013-07-17 Created: 2013-07-17 Last updated: 2013-08-06Bibliographically approved

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Riipinen, IlonaKulmala, Markku
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