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| Titel |
Results from the University of Toronto continuous flow diffusion chamber at ICIS 2007: instrument intercomparison and ice onsets for different aerosol types |
| VerfasserIn |
Z. A. Kanji, P. J. DeMott, O. Möhler, J. P. D. Abbatt |
| 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 ; 11, no. 1 ; Nr. 11, no. 1 (2011-01-03), S.31-41 |
| Datensatznummer |
250009054
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| Publikation (Nr.) |
 copernicus.org/acp-11-31-2011.pdf |
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| Zusammenfassung |
| The University of Toronto continuous flow diffusion chamber (UT-CFDC) was
used to study heterogeneous ice nucleation at the International Workshop on
Comparing Ice Nucleation Measuring Systems (ICIS 2007) which also represented
the 4-th ice nucleation workshop, on 14–28 September 2007. One goal of the
workshop was to inter-compare different ice nucleation measurement techniques
using the same aerosol sample source and preparation method. The aerosol
samples included four types of desert mineral dust, graphite soot particles,
and live and dead bacterial cells (Snomax®). This paper
focuses on the UT-CFDC results, with a comparison to techniques of
established heritage including the Colorado State CFDC and the AIDA expansion
chamber. Good agreement was found between the different instruments with a
few specific differences, especially at low temperatures, perhaps due to the
variation in how onset of ice formation is defined between the instruments
and the different inherent residence times. It was found that when efficiency
of ice formation is based on the lowest onset relative humidity,
Snomax® particles were most efficient followed by the desert
dusts and then soot. For all aerosols, deposition mode freezing was only
observed for T<45 K except for the dead bacteria where freezing occurred
below water saturation as warm as 263 K. |
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