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| Titel |
3-D imaging and quantification of graupel porosity by synchrotron-based micro-tomography |
| VerfasserIn |
F. Enzmann, M. M. Miedaner, M. Kersten, N. Blohn, K. Diehl, S. Borrmann, M. Stampanoni, M. Ammann, T. Huthwelker |
| 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. 10 ; Nr. 4, no. 10 (2011-10-19), S.2225-2234 |
| Datensatznummer |
250002120
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| Publikation (Nr.) |
 copernicus.org/amt-4-2225-2011.pdf |
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| Zusammenfassung |
| The air bubble structure is an important parameter to determine the
radiation properties of graupel and hailstones. For 3-D imaging of this
structure at micron resolution, a cryo-stage was developed. This stage was
used at the tomography beamline of the Swiss Light Source (SLS) synchrotron
facility. The cryo-stage setup provides for the first time 3-D-data on the
individual pore morphology of ice particles down to infrared wavelength
resolution. In the present study, both sub-mm size natural and artificial
ice particles rimed in a wind tunnel were investigated. In the natural rimed
ice particles, Y-shaped air-filled closed pores were found. When kept for
half an hour at −8 °C, this morphology transformed into smaller and more
rounded voids well known from literature. Therefore, these round structures
seem to represent an artificial rather than in situ pore structure, in
contrast to the observed y-shaped structures found in the natural ice
particles. Hence, for morphological studies on natural ice samples, special
care must be taken to minimize any thermal cycling between sampling and
measurement, with least artifact production at liquid nitrogen temperatures. |
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