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| Titel |
Intercomparison of air ion spectrometers: an evaluation of results in varying conditions |
| VerfasserIn |
S. Gagné, K. Lehtipalo, H. E. Manninen, T. Nieminen, S. Schobesberger, A. Franchin, T. Yli-Juuti, J. Boulon, A. Sonntag, S. Mirme, A. Mirme, U. Hõrrak, T. Petäjä, E. Asmi, M. Kulmala  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 4, no. 5 ; Nr. 4, no. 5 (2011-05-04), S.805-822 |
| Datensatznummer |
250001975
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| Publikation (Nr.) |
 copernicus.org/amt-4-805-2011.pdf |
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| Zusammenfassung |
| We evaluated 11 air ion spectrometers from Airel Ltd. after they had spent
one year in field measurements as a part of the EUCAARI project: 5 Air Ion
Spectrometers (AIS), 5 Neutral cluster and Air Ion Spectrometers (NAIS) and
one Airborne NAIS (ANAIS). This is the first time that an ANAIS is evaluated and compared so extensively. The ion spectrometers'
mobility and concentration accuracy was evaluated. Their measurements of
ambient air were compared between themselves and to reference instruments: a
Differential Mobility Particle Sizer (DMPS), a Balanced Scanning Mobility
Analyzer (BSMA), and an Ion-DMPS. We report on the simultaneous measurement
of a new particle formation (NPF) event by all 11 instruments and the 3
reference instruments. To our knowledge, it is the first time that the size
distribution of ions and particles is measured by so many ion spectrometers
during a NPF event. The new particle formation rates (~0.2 cm−3 s−1
for ions and ~2 cm−3 s−1 for particles) and
growth rates (~25 nm h−1 in the 3–7 nm size range) were calculated for
all the instruments. The NAISs and the ANAIS gave higher concentrations and
formation rates than the AISs. For example, the AISs agreed with the BSMA
within 11 % and 28 % for negative and positive ion concentration
respectively, whereas the NAISs agreed within 23 % and 29 %. Finally,
based on the results presented here, we give guidelines for data evaluation, when data from different
individual ion spectrometers are compared. |
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