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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Long-term field measurements of charged and neutral clusters using Neutral cluster and Air Ion Spectrometer (NAIS)
Boreal Environment Research, Volume 14, No. 4, Year 2009
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Description
To understand the very first steps of atmospheric particle formation and growth, measurements at the size where atmospheric nucleation occurs are crucially needed. We present number size distributions of > 0.8 nm ions and > 1.8 nm particles measured with the Neutral cluster and Air Ion Spectrometer (NAIS) at a boreal forest site in Hyytiälä, Finland, during 2006-2007. Pools of neutral and charged clusters seem to be present all the time below 3 nm. The total concentration of 1.8-3.0 nm clusters was ~1000 cm-3, ranging from 50 to 6000 cm-3, whereas the concentrations of charged clusters in this size range remained below 50 cm-3. On average, both neutral and charged clusters seem to have different diurnal cycles on particle formation event and non-event days. We also compared the NAIS-derived concentrations with those obtained from other concurrent air ion and particle instruments and found that the NAIS concentrations are in agreement with concentrations determined with these other instruments. © 2009.
Authors & Co-Authors
Manninen, Hanna Elina
Finland, Helsinki
Helsingin Yliopisto
Petäj̈ä, Tuukka
Finland, Helsinki
Helsingin Yliopisto
Asmi, Eija
Finland, Helsinki
Helsingin Yliopisto
Finland, Helsinki
Finnish Meteorological Institute
Nieminen, Tuomo
Finland, Helsinki
Helsingin Yliopisto
Hõrrak, Urmas
Estonia, Tartu
Tartu Ülikool
Mirme, Aadu
Estonia, Tartu
Tartu Ülikool
Mirme, Sander
Estonia, Tartu
Tartu Ülikool
Laakso, Lauri
Finland, Helsinki
Helsingin Yliopisto
Kerminen, Veli Matti
Finland, Helsinki
Finnish Meteorological Institute
Kulmala, Markku
Finland, Helsinki
Helsingin Yliopisto
Statistics
Citations: 100
Authors: 10
Affiliations: 3
Identifiers
ISSN:
12396095
Research Areas
Environmental