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| Titel |
Influence of stress, temperature and crystal morphology on isothermal densification and specific surface area decrease of new snow |
| VerfasserIn |
S. Schleef, H. Löwe, M. Schneebeli |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1994-0416
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| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 8, no. 5 ; Nr. 8, no. 5 (2014-10-09), S.1825-1838 |
| Datensatznummer |
250116322
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| Publikation (Nr.) |
 copernicus.org/tc-8-1825-2014.pdf |
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| Zusammenfassung |
| Laboratory-based, experimental data for the microstructural
evolution of new snow are scarce, though applications would benefit
from a quantitative characterization of the main influences. To this
end, we have analyzed the metamorphism and concurrent densification
of new snow under isothermal conditions by means of X-ray
microtomography and compiled a comprehensive data set of 45 time
series. In contrast to previous measurements on isothermal
metamorphism on time scales of weeks to months, we analyzed the
initial 24–48 h of snow evolution at a high temporal resolution of
3 hours. The data set comprised natural and laboratory-grown
snow, and experimental conditions included systematic variations of
overburden stress, temperature and crystal habit to address the main
influences on specific surface area (SSA) decrease rate and
densification rate in a snowpack. For all conditions, we found a
linear relation between density and SSA, indicating that
metamorphism has an immediate influence for the densification of new
snow. The slope of the linear relation, however, depends on the other
parameters which were analyzed individually to derive a best-fit
parameterization for the SSA decrease rate and densification
rate. In the investigated parameter range, we found that the initial
value of the SSA constituted the main morphological influence on the
SSA decrease rate. In turn, the SSA decrease rate constituted the
main influence on the densification rate. |
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