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| Titel |
Characterization of the Micro-Orifice Uniform Deposit Impactor-droplet freezing technique (MOUDI-DFT) for size-resolved quantitative measurements of ice nuclei |
| VerfasserIn |
Ryan Mason, Meng Si, Jixiao Li, J. Alex Huffman, Christina McCluskey, Ezra Levin, Victoria Irish, Cédric Chou, Thomas Hill, Luis Ladino, Jacqueline Yakobi, Corinne Schiller, Jon Abbatt, Paul DeMott, Allan Bertram |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250094282
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| Publikation (Nr.) |
 EGU/EGU2014-9686.pdf |
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| Zusammenfassung |
| Ice formation within a cloud system can significantly modify its lifetime and radiative
forcing. Many current instruments for measuring atmospheric concentrations of ice nuclei
(IN) are not capable of providing size-resolved information. Such knowledge is useful in
identifying the sources of IN and predicting their transport in the atmosphere. Furthermore,
those that use size-discrimination to identify IN typically exclude particles with an
aerodynamic diameter greater than 2.5 μm from analysis. Several studies have indicated this
may be an important size regime for IN, particularly with those activating at warmer
temperatures.
The recently developed Micro-Orifice Uniform Deposit Impactor-droplet freezing
technique (MOUDI-DFT) addresses these limitations through combining sample collection
by a model of cascade impactor with an established immersion freezing apparatus. Here we
present a characterization of the MOUDI-DFT and the development of a modified technique
which address experimental uncertainties arising from sample deposit inhomogeneity and the
droplet freezing method. An intercomparison with a continuous-flow diffusion chamber
(CFDC) was performed.
We also show preliminary results from a campaign undertaken in a remote coastal region
of western Canada. Correlations between atmospheric IN concentrations and the
abundance of suspended submicron and supermicron particles, biological aerosols,
carbonaceous aerosols, and prevailing meteorological conditions were investigated. |
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