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 organization: Department of Physics
Aerosol-Cloud-Climate -Interactions (ACCI)
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
Peer reviewed: Yes
Rights: other
Usage restriction: openAccess
Self-archived version: publishedVersion


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