Major contribution of neutral clusters to new particle formation at the interface between the boundary layer and the free troposphere

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http://hdl.handle.net/10138/161732

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Rose , C , Sellegri , K , Asmi , E , Hervo , M , Freney , E , Colomb , A , Junninen , H , Duplissy , J , Sipilä , M , Kontkanen , J , Lehtipalo , K & Kulmala , M 2015 , ' Major contribution of neutral clusters to new particle formation at the interface between the boundary layer and the free troposphere ' , Atmospheric Chemistry and Physics , vol. 15 , no. 6 , pp. 3413-3428 . https://doi.org/10.5194/acp-15-3413-2015

Title: Major contribution of neutral clusters to new particle formation at the interface between the boundary layer and the free troposphere
Author: Rose, C.; Sellegri, K.; Asmi, E.; Hervo, M.; Freney, E.; Colomb, A.; Junninen, H.; Duplissy, J.; Sipilä, Mikko; Kontkanen, J.; Lehtipalo, K.; Kulmala, Markku
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2015
Language: eng
Number of pages: 16
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
URI: http://hdl.handle.net/10138/161732
Abstract: The formation of new aerosol particles in the atmosphere is a key process influencing the aerosol number concentration as well as the climate, in particular at high altitude, where the newly formed particles directly influence cloud formation. However, free tropospheric new particle formation (NPF) is poorly documented due to logistic limitations and complex atmospheric dynamics around high-altitude stations that make the observation of this day-time process challenging. Recent improvements in measurement techniques make now possible the detection of neutral clusters down to similar to 1 nm sizes, which opens new horizons in our understanding of the nucleation process. Indeed, only the charged fraction of clusters has been reported in the upper troposphere up to now. Here we report day-time concentrations of charged and neutral clusters (1 to 2.5 nm mobility diameter) recorded at the interface between the boundary layer (BL) and the FT as well as in the FT at the altitude site of Puy de Dome (1465 m a.s.l.), central France, between 10 and 29 February 2012. Our findings demonstrate that in the FT, and especially at the interface between the BL and the FT, the formation of 1.5 nm neutral clusters significantly exceeds the one of ionic clusters during NPF events, clearly indicating that they dominate in the nucleation process. We also observe that the total cluster concentration significantly increases during NPF events compared to the other days, which was not clearly observed for the charged cluster population in the past. During the studied period, the nucleation process does not seem to be sulfuric acid-limited and could be promoted by the transport of pollutants to the upper troposphere, coupled with low temperatures.
Subject: AIR ION SPECTROMETER
ATMOSPHERIC AEROSOL NUCLEATION
HIGH-ALTITUDE SITE
DOME RESEARCH STATION
SULFURIC-ACID
BOREAL FOREST
LONG-TERM
SIZE DISTRIBUTIONS
SEASONAL-VARIATION
GROWTH-RATES
114 Physical sciences
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