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

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Lampilahti , J , Manninen , H , Leino (os. Paananen) , K , Väänänen , R , Manninen , A , Buenrostro Mazon , S N , Nieminen , T , Leskinen , M , Enroth , J , Bister , M , Zilitinkevich , S , Kangasluoma , J , Järvinen , H , Kerminen , V-M , Petäjä , T & Kulmala , M 2020 , ' Roll vortices induce new particle formation bursts in the planetary boundary layer ' , Atmospheric Chemistry and Physics , vol. 20 , no. 20 , pp. 11841–11854 . https://doi.org/10.5194/acp-20-11841-2020

Title: Roll vortices induce new particle formation bursts in the planetary boundary layer
Author: Lampilahti, Janne; Manninen, Hanna; Leino (os. Paananen), Katri; Väänänen, Riikka; Manninen, Antti; Buenrostro Mazon, Stephany N.; Nieminen, Tuomo; Leskinen, Matti; Enroth, Joonas; Bister, Marja; Zilitinkevich, Sergej; Kangasluoma, Juha; Järvinen, Heikki; Kerminen, Veli-Matti; Petäjä, Tuukka; Kulmala, Markku
Contributor: University of Helsinki, INAR Physics
University of Helsinki, Finnish Meteorological Institute
University of Helsinki, Research Services
University of Helsinki, INAR Physics
University of Helsinki, Finnish Meteorological Institute
University of Helsinki, Global Atmosphere-Earth surface feedbacks
University of Helsinki, Global Atmosphere-Earth surface feedbacks
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, INAR Physics
University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Global Atmosphere-Earth surface feedbacks
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2020-10-21
Language: eng
Number of pages: 14
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7324
URI: http://hdl.handle.net/10138/324274
Abstract: Recent studies have shown the importance of new particle formation (NPF) to global cloud condensation nuclei (CCN) production, as well as to air pollution in megacities. In addition to the necessary presence of low-volatility vapors that can form 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 of 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 localized bursts grow in size similar to particles typically ascribed to atmospheric NPF that occur almost homogeneously at a regional scale. 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 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.
Subject: 114 Physical sciences
NUCLEATION MODE PARTICLES
FORMATION EVENTS
BOREAL-FOREST
AIRBORNE MEASUREMENTS
CONVECTION
TURBULENCE
SPECTROMETER
AIRCRAFT
CLUSTER
FLUXES
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