Ion-induced sulfuric acid-ammonia nucleation drives particle formation in coastal Antarctica

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http://hdl.handle.net/10138/278424

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Jokinen , T , Sipilä , M , Kontkanen , J , Vakkari , V , Tisler , P , Duplissy , E-M , Junninen , H , Kangasluoma , J , Manninen , H E , Petäjä , T , Kulmala , M , Worsnop , D R , Kirkby , J , Virkkula , A & Kerminen , V-M 2018 , ' Ion-induced sulfuric acid-ammonia nucleation drives particle formation in coastal Antarctica ' , Science Advances , vol. 4 , no. 11 , 9744 . https://doi.org/10.1126/sciadv.aat9744

Title: Ion-induced sulfuric acid-ammonia nucleation drives particle formation in coastal Antarctica
Author: Jokinen, T.; Sipilä, M.; Kontkanen, J.; Vakkari, V.; Tisler, P.; Duplissy, E.-M.; Junninen, H.; Kangasluoma, J.; Manninen, H. E.; Petäjä, T.; Kulmala, M.; Worsnop, D. R.; Kirkby, J.; Virkkula, A.; Kerminen, V.-M.
Contributor: University of Helsinki, INAR Physics
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
Date: 2018-11
Language: eng
Number of pages: 6
Belongs to series: Science Advances
ISSN: 2375-2548
URI: http://hdl.handle.net/10138/278424
Abstract: Formation of new aerosol particles from trace gases is a major source of cloud condensation nuclei (CCN) in the global atmosphere, with potentially large effects on cloud optical properties and Earth's radiative balance. Controlled laboratory experiments have resolved, in detail, the different nucleation pathways likely responsible for atmospheric new particle formation, yet very little is known from field studies about the molecular steps and compounds involved in different regions of the atmosphere. The scarcity of primary particle sources makes secondary aerosol formation particularly important in the Antarctic atmosphere. Here, we report on the observation of ion-induced nucleation of sulfuric acid and ammonia-a process experimentally investigated by the CERN CLOUD experiment-as a major source of secondary aerosol particles over coastal Antarctica. We further show that measured high sulfuric acid concentrations, exceeding 10(7) molecules cm(-3), are sufficient to explain the observed new particle growth rates. Our findings show that ion-induced nucleation is the dominant particle formation mechanism, implying that galactic cosmic radiation plays a key role in new particle formation in the pristine Antarctic atmosphere.
Subject: SOUTH-POLE
SIZE DISTRIBUTIONS
GROWTH-RATES
COSMIC-RAYS
AEROSOL
H2SO4
SPECTROMETER
CONDENSATION
MSA
OH
114 Physical sciences
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