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| Titel |
Seasonal cycle and modal structure of particle number size distribution at Dome C, Antarctica |
| VerfasserIn |
E. Järvinen, A. Virkkula, T. Nieminen, P. P. Aalto, E. Asmi, C. Lanconelli, M. Busetto, A. Lupi, R. Schioppo, V. Vitale, M. Mazzola, T. Petäjä, V.-M. Kerminen, M. Kulmala  |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 15 ; Nr. 13, no. 15 (2013-08-05), S.7473-7487 |
| Datensatznummer |
250085605
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| Publikation (Nr.) |
 copernicus.org/acp-13-7473-2013.pdf |
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| Zusammenfassung |
| We studied new particle formation and modal behavior of ultrafine aerosol
particles on the high East Antarctic plateau at the Concordia station, Dome
C (75°06' S, 123°23' E). Aerosol particle number size
distributions were measured in the size range 10–600 nm from 14 December
2007 to 7 November 2009. We used an automatic algorithm for fitting up to
three modes to the size distribution data. The total particle number
concentration was low with the median of 109 cm−3. There was a clear
seasonal cycle in the total particle number and the volume concentrations.
The concentrations were at their highest during the austral summer with the
median values of 260 cm−3 and 0.086 μm3 cm−3, and at
their lowest during the austral winter with corresponding values of 15 cm−3 and 0.009 μm3 cm−3. New particle formation
events were determined from the size distribution data. During the
measurement period, natural new particle formation was observed on 60 days
and for 15 of these days the particle growth rates from 10 to 25 nm in size
could be determined. The median particle growth rate during all these events
was 2.5 nm h−1 and the median formation rate of 10 nm particles was
0.023 cm−3 s−1. Most of the events were similar to those observed
at other continental locations, yet also some variability in event types was
observed. Exceptional features in Dome C were the winter events that
occurred during dark periods, as well as the events for which the growth
could be followed during several consecutive days. We called these latter
events slowly growing events. This paper is the first one to analyze
long-term size distribution data from Dome C, and also the first paper to
show that new particle formation events occur in central Antarctica. |
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