References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-7-4081-2007

Evaluation and modeling of the size fractionated aerosol particle number concentration measurements nearby a major road in Helsinki – Part II: Aerosol measurements within the SAPPHIRE project

Hussein

¹ ² Kukkonen

³ Korhonen

³ ⁴ Pohjola

³ Pirjola

¹ ⁵ Wraith

⁶ Härkönen

³ Teinilä

³ Koponen

I. K.

¹ ⁷ Karppinen

³ Hillamo

³ Kulmala

University of Helsinki, Department of Physical Sciences, Finland

Stockholm University, Department of Applied Environmental Science, Sweden

Finnish Meteorological Institute, Air Quality Research, Finland

Institute for Atmospheric Science, School of Earth and Environment, University of Leeds, UK

Helsinki Polytechnic, Department of Technology, Finland

School of Mathematical Science, Queensland University of Technology, Brisbane, Australia

Department of Chemistry, University of Copenhagen, Denmark

03 08 2007

7 15 4081 4094

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/7/4081/2007/acp-7-4081-2007.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/7/4081/2007/acp-7-4081-2007.pdf

This study presents an evaluation and modeling exercise of the size fractionated aerosol particle number concentrations measured nearby a major road in Helsinki during 23 August–19 September 2003 and 14 January–11 February 2004. The available information also included electronic traffic counts, on-site meteorological measurements, and urban background particle number size distribution measurement. The ultrafine particle (UFP, diameter<100 nm) number concentrations at the roadside site were approximately an order of magnitude higher than those at the urban background site during daytime and downwind conditions. Both the modal structure analysis of the particle number size distributions and the statistical correlation between the traffic density and the UFP number concentrations indicate that the UFP were evidently from traffic related emissions. The modeling exercise included the evolution of the particle number size distribution nearby the road during downwind conditions. The model simulation results revealed that the evaluation of the emission factors of aerosol particles might not be valid for the same site during different time.

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