Articles | Volume 3, issue 2
Ocean Sci., 3, 291–298, 2007
https://doi.org/10.5194/os-3-291-2007
Ocean Sci., 3, 291–298, 2007
https://doi.org/10.5194/os-3-291-2007

  30 May 2007

30 May 2007

Scaling aspects of the sea-ice-drift dynamics and pack fracture

A. Chmel1, V. N. Smirnov2, and L. V. Panov2 A. Chmel et al.
  • 1Fracture Physics Department, Ioffe Physico-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia
  • 2Arctic and Antarctic Research Institute, Bering street, 38, 199397 St. Petersburg, Russia

Abstract. 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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