20 Jul 2022
20 Jul 2022
Status: this preprint is currently under review for the journal ACP.

Measurement report: Atmopsheric new particle formation in a peri-urban site in Lille, Northern France

Suzanne Crumeyrolle1, Jenni Kontkanen2,3, Clémence Rose4, Alejandra Velasquez Garcia1,5, Eric Bourrianne1, Maxime Catalfamo1, Véronique Riffault5, Emmanuel Tison5, Joel Ferreira de Brito5, Nicolas Visez6, Nicolas Ferlay1, Frédérique Auriol1, and Isabelle Chiapello1 Suzanne Crumeyrolle et al.
  • 1Univ. Lille, CNRS, UMR 8518 Laboratoire d'Optique Atmosphérique (LOA), 59000 Lille, France
  • 2CSC - IT Center for Science, Espoo, Finland
  • 3Institute for Atmospheric and Earth system Research, University of Helsinki, Helsinki, Finland
  • 4Laboratoire de Météorologie Physique, LaMP-UMR 6016, CNRS, Université Clermont Auvergne, 63178, Aubière, France
  • 5IMT Nord Europe, Institut Mines-Télécom, Univ. Lille, Centre for Energy and Environment, F-59000 Lille, France
  • 6Univ. Lille, CNRS, UMR 8516 - LASIRE - LAboratoire de Spectroscopie pour les Interactions, la Réactivité et l'Environnement, F-59000 Lille, France

Abstract. Formation of Ultrafine particles (UFPs) in the urban atmosphere is expected to be less favored than in the rural atmosphere due to the high existing particle surface area acting as a sink for newly-formed particles Despite the large condensation sink (CS) values, previous comparative studies between rural and urban site reported higher frequency of new particle formation (NPF) events over urban sites in comparison to background sites as well as higher particle formation and growth rates attributed to the higher concentration of condensable species. The present study aims to better understand the environmental factors favoring, or disfavoring, atmospheric NPF over Lille, a large city North of France and to analyze their impact on particle number concentration using a long-term dataset (4 years : 1st July 2017 to 31st December 2020).

The results highlight a strong seasonal variation of the NPF occurrences with a maximum observed during spring (27 events) and summer (53 events). It was found that high temperature (T > 295 K), low RH (RH < 45 %) and high solar radiation are ideal to observe NPF events over Lille. Relatively high values of condensation sink (CS ~ 2.10-2 s-1) are reported during event days suggesting that high CS does not inhibit the occurrence of NPFt over our site. Moreover, the particle Growth Rate (GR15.7-30 nm) was positively correlated with the temperature most probably linked to the higher emissions of precursors. Finally, the nucleation strength factor (NSF) was calculated to highlight the impact of those NPF events on particle number concentrations. NSF15.7-100 reaches a maximum of 4 in summer, indicating an enormous contribution of NPF events to particle number concentration at this time of the year.

Suzanne Crumeyrolle et al.

Status: open (until 31 Aug 2022)

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Suzanne Crumeyrolle et al.

Data sets

Data for acp-2022-436 Crumeyrolle Suzanne

Suzanne Crumeyrolle et al.


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Short summary
Ultrafine particles (UFPs) are particles with an aerodynamic diameter of 100 nm or less, has negligible mass concentration but is the dominant contributor to the total particle number concentration. The present study aims to better understand the environmental factors favoring or inhibiting, atmospheric new particle formation (NPF) over Lille a large city North of France and to analyze the impact of such event on urban air quality using a long-term dataset (3 years).