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Volume 16, issue 14
Atmos. Chem. Phys., 16, 8715–8728, 2016
https://doi.org/10.5194/acp-16-8715-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 16, 8715–8728, 2016
https://doi.org/10.5194/acp-16-8715-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 18 Jul 2016

Research article | 18 Jul 2016

Regional effect on urban atmospheric nucleation

Imre Salma1, Zoltán Németh1, Veli-Matti Kerminen2, Pasi Aalto2, Tuomo Nieminen2, Tamás Weidinger3, Ágnes Molnár4, Kornélia Imre4, and Markku Kulmala2 Imre Salma et al.
  • 1Institute of Chemistry, Eötvös University, 1518 Budapest, P.O. Box 32, Hungary
  • 2Department of Physics, 00014 University of Helsinki, Helsinki, P.O. Box 64, Finland
  • 3Department of Meteorology, Eötvös University, 1518 Budapest, P.O. Box 32, Hungary
  • 4MTA-PE Air Chemistry Research Group, 8201 Veszprém, P.O. Box 158, Hungary

Abstract. Secondary aerosol particle production via new particle formation (NPF) has been shown to be a major contributor to the global aerosol load. NPF has also been observed frequently in urban environments. Here, we investigate the effect of regional NPF on urban aerosol load under well-defined atmospheric conditions. The Carpathian Basin, the largest orogenic basin in Europe, represents an excellent opportunity for exploring these interactions. Based on long-term observations, we revealed that NPF seen in a central large city of the basin (Budapest) and its regional background occur in a consistent and spatially coherent way as a result of a joint atmospheric phenomenon taking place on large horizontal scales. We found that NPF events at the urban site are usually delayed by > 1 h relative to the rural site or even inhibited above a critical condensational sink level. The urban processes require higher formation rates and growth rates to be realized, by mean factors of 2 and 1.6, respectively, than the regional events. Regional- and urban-type NPF events sometimes occur jointly with multiple onsets, while they often exhibit dynamic and timing properties which are different for these two event types.

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We revealed that NPF seen in a central large city of the Carpathian Basin, Budapest, and its regional background occur in a consistent and spatially coherent way as a result of a joint atmospheric phenomenon taking place on large horizontal scales.
We revealed that NPF seen in a central large city of the Carpathian Basin, Budapest, and its...
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