Characteristics of new-particle formation at three SMEAR stations

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http://hdl.handle.net/10138/165338

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Vana , M , Komsaare , K , Horrak , U , Mirme , S , Nieminen , T , Kontkanen , J , Manninen , H E , Petäjä , T , Noe , S M & Kulmala , M 2016 , ' Characteristics of new-particle formation at three SMEAR stations ' , Boreal Environment Research , vol. 21 , no. 3-4 , pp. 345-362 .

Title: Characteristics of new-particle formation at three SMEAR stations
Author: Vana, Marko; Komsaare, Kaupo; Horrak, Urmas; Mirme, Sander; Nieminen, Tuomo; Kontkanen, Jenni; Manninen, Hanna E.; Petäjä, Tuukka; Noe, Steffen M.; 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
Date: 2016-05-23
Language: eng
Number of pages: 18
Belongs to series: Boreal Environment Research
ISSN: 1239-6095
URI: http://hdl.handle.net/10138/165338
Abstract: We analyzed the size distributions of atmospheric aerosol particles measured during 2013-2014 at Varrio (SMEAR I) in northern Finland, Hyytiala (SMEAR II) in southern Finland and Jarvselja (SMEAR-Estonia) in Estonia. The stations are located on a transect spanning from north to south over 1000 km and they represent different environments ranging from subarctic to the hemi-boreal. We calculated the characteristics of new-particle-formation events, such as the frequency of events, growth rate of nucleation mode particles, condensation and coagulation sinks, formation rate of 2 nm and 3 nm particles, and source rate of condensable vapors. We observed 59, 185 and 108 new-particle-formation events at Varrio, Hyytiala and Jarvselja, respectively. The frequency of the observed events showed an annual variation with a maximum in spring. The analysis revealed size dependence of growth rate at all locations. We found that the growth rate and source rate of a condensable vapor were the highest in Jarvselja and the lowest in Varrio. The condensation sink and particle formation rate were of a similar magnitude at Hyytiala and Jarvselja, but several times smaller at Varrio. Tracking the origin of air masses revealed that the number concentration of nucleation mode particles (3-25 nm) varied from north to south, with the highest concentrations at Jarvselja and lowest at Varrio. Trajectory analysis indicated that new-particle-formation events are large-scale phenomena that can take place concurrently at distant stations located even 1000 km apart. We found a total of 26 days with new-particle-formation events occurring simultaneously at all three stations.
Subject: NUCLEATION MODE PARTICLES
AIR ION SPECTROMETER
ATMOSPHERIC AEROSOL NUCLEATION
LAPBIAT MEASUREMENT CAMPAIGN
CONTINENTAL BOUNDARY-LAYER
HEMIBOREAL MIXED FOREST
SIZE DISTRIBUTION DATA
FORMATION EVENTS
BOREAL-FOREST
INTERMEDIATE IONS
114 Physical sciences
1172 Environmental sciences
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