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| Titel |
Scanning electron microscopy and molecular dynamics of surfaces of growing and ablating hexagonal ice crystals |
| VerfasserIn |
W. C. Pfalzgraff, R. M. Hulscher, S. P. Neshyba |
| 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 ; 10, no. 6 ; Nr. 10, no. 6 (2010-03-29), S.2927-2935 |
| Datensatznummer |
250008265
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| Publikation (Nr.) |
 copernicus.org/acp-10-2927-2010.pdf |
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| Zusammenfassung |
| We present the first clearly resolved observations of
surfaces of growing and ablating hexagonal ice crystals using
variable-pressure scanning electron microscopy. The ice surface develops
trans-prismatic strands, separated from one another by distances of 5–10 μm.
The strands are present at a wide range of supersaturations, but
are most pronounced at temperatures near the frost point. Pyramidal facets
consistent with Miller-Bravais indices of 1011, and possibly also 2021,
are associated with ice growth under these conditions. A
molecular-dynamics model of a free-standing ice Ih nanocolumn containing
8400 water molecules does not develop trans-prismatic strands, suggesting
these features originate at larger spatial or temporal scales. The possible
relevance of these surface features to cirrus ice is discussed. |
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