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| Titel |
Scaling aspects of the sea-ice-drift dynamics and pack fracture |
| VerfasserIn |
A. Chmel, V. N. Smirnov, L. V. Panov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 3, no. 2 ; Nr. 3, no. 2 (2007-05-30), S.291-298 |
| Datensatznummer |
250000928
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| Publikation (Nr.) |
 copernicus.org/os-3-291-2007.pdf |
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| Zusammenfassung |
| A study of the sea-ice dynamics in the periods of time prior to and
during the cycles of basin-wide fragmentation of the ice cover in the Arctic
Ocean is presented. The fractal geometry of the ice-sheets limited by leads
and ridges was assessed using the satellite images, while the data on the
correlated sea-ice motion were obtained in the research stations "North
Pole 32" and "North Pole 33" established on the ice pack. The revealed
decrease of the fractal dimension as a result of large-scale fragmentation
is consistent with the localization of the fracture process (leads
propagation). At the same time, the scaling properties of the distribution
of amplitudes of ice-fields accelerations were insensitive to the event of
sea-ice fragmentation. The temporal distribution of the accelerations was
scale-invariant during "quiet" periods of sea-ice drift but disordered in
the period of mechanical perturbation. The period of decorrelated (in time)
ice-field motion during the important fracture event was interpreted as an
inter-level transition in the hierarchic dynamical system. The mechanism of
the long-range correlations in the sea-ice cover, including the fracture
process, is suggested to be in relation with the self-organized oscillation
dynamics inherent in the ice pack. |
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