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On the accuracy of ion measurements using a Neutral cluster and Air Ion Spectrometer

Autor(en)
Robert Wagner, Hanna E. Manninen, Alessandro Franchin, Katrianne Lehtipalo, Sander Mirme, Gerhard Steiner, Tuukka Petaja, Markku Kulmala
Abstrakt

Here, we present a calibration of the Neutral cluster and Air Ion Spectrometer (NAIS, Airel Ltd.) for the size and concentration of ions in the mobility-diameter size-range 0.98-29.1 nm. Previous studies raised accuracy issues in size and concentration determination and highlighted the importance of used data inversion algorithm. Therefore, we investigated the performance of the NAIS by using five inversion methods. The presented results illustrate that the size information given by the NAIS is very accurate, regardless of the version of the data inversion. The number concentrations determined by the NAIS were 15%-30% too low especially at the lower end of the measurement size range (< 5 nm), whereas concentrations at diameters 19.6 nm and larger were overestimated by up to 8%. With the correction presented in this study, the uncertainty of the ion concentration measurement of the NAIS can be reduced to less than 10%, allowing the NAIS to be used in quantitative ion cluster studies and more accurate determination of formation and growth rates.

Organisation(en)
Aerosolphysik und Umweltphysik
Externe Organisation(en)
University of Helsinki, Paul Scherrer Institute, University of Tartu, Leopold-Franzens-Universität Innsbruck
Journal
Boreal Environment Research: an international interdisciplinary journal
Band
21
Seiten
230-241
Anzahl der Seiten
12
ISSN
1239-6095
Publikationsdatum
05-2016
Peer-reviewed
Ja
ÖFOS 2012
103037 Umweltphysik, 103039 Aerosolphysik
Schlagwörter
ASJC Scopus Sachgebiete
Ecological Modelling, Pollution, Agricultural and Biological Sciences (miscellaneous), Atmospheric Science
Link zum Portal
https://ucrisportal.univie.ac.at/de/publications/024f8a08-2664-45a7-b094-90d54dcb5ddd