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Preprints
https://doi.org/10.5194/acp-2019-1013
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1013
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 27 Feb 2020

Submitted as: research article | 27 Feb 2020

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This preprint is currently under review for the journal ACP.

Roll vortices induce new particle formation bursts in the planetary boundary layer

Janne Lampilahti1, Hanna Elina Manninen2, Katri Leino1, Riikka Väänänen1, Antti Manninen3, Stephany Buenrostro Mazon1, Tuomo Nieminen1, Matti Leskinen1, Joonas Enroth1, Marja Bister1, Sergej Zilitinkevich1,3,4, Juha Kangasluoma1,5, Heikki Järvinen1, Veli-Matti Kerminen1, Tuukka Petäjä1,6, and Markku Kulmala1,5,6 Janne Lampilahti et al.
  • 1Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, Helsinki, Finland
  • 2CERN, CH-1211 Geneva, Switzerland
  • 3Finnish Meteorological Institute, Helsinki, Finland
  • 4Department of Radio-physics, University of Nizhny, Novgorod, Russia
  • 5Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, China
  • 6Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing University, Nanjing, China

Abstract. Recent studies have shown the importance of new particle formation (NPF) to global cloud concensation nuclei (CCN) production, as well as to air pollution in megacities. In addition to the necessary presence of low-volatility vapors that can form the new aerosol particles, both numerical and observational studies have shown that the dynamics of the planetary boundary layer (BL) plays an important role in NPF. Evidence from field observations suggests that roll vortices might be favorable for inducing NPF in a convective BL. However, direct observations and estimates on the potential importance of this phenomenon to the production of new aerosol particles are lacking. Here we show that rolls frequently induce NPF bursts along the horizontal circulations, and that the small clusters and particles originating from these bursts grow in size similar to particles typically ascribed to regional-scale atmospheric NPF. We outline a method to identify roll-induced NPF from measurements and, based on the collected data, estimate the impact of roll vortices on the overall aerosol particle production due to NPF at a boreal forest site (83 ± 34 % and 26 ± 8 % overall enhancement in particle formation for 3-nm and 10-nm particles respectively). We conclude that the formation of roll vortices should be taken into account when estimating particle number budgets in the atmospheric BL.

Janne Lampilahti et al.

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Data set of airborne and ground-based atmospheric measurements from Hyytiälä, Finland J. Lampilahti, H. E. Manninen, K. Leino, R. Väänänen, A. Manninen, S. Buenrostro Mazon, T. Nieminen, M. Leskinen, J. Enroth, M. Bister, S. Zilitinkevich, J. Kangasluoma, H. Järvinen, V.-M. Kerminen, T. Petäjä, and M. Kulmala https://doi.org/10.5281/zenodo.3688471

Janne Lampilahti et al.

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Short summary
In this work, by using co-located airborne and ground-based measurements, we show that counter-rotating horizontal circulations in the planetary boundary layer (roll vortices) frequently enhance regional new particle formation, or induce localized bursts of new particle formation. These observations can be explained by the ability of the rolls to efficiently lift low-volatile vapors emitted from the surface to the top of the boundary layer where new particle formation is more favorable.
In this work, by using co-located airborne and ground-based measurements, we show that...
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