Table of Contents
ISRN Oceanography
Volume 2013 (2013), Article ID 540407, 6 pages
http://dx.doi.org/10.5402/2013/540407
Research Article

Nonextensive Dynamics of Drifting Sea Ice

1Fracture Physics Department, Ioffe Physico-Technical Institute, Russian Academy of Sciences, St. Petersburg 194021, Russia
2Arctic and Antarctic Research Institute, 38 Bering Street, St. Petersburg 199397, Russia

Received 30 July 2012; Accepted 8 October 2012

Academic Editors: M. Lipinski and J. L. Zhou

Copyright © 2012 Alexandre Chmel and Victor Smirnov. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Cycles of ice pack fragmentation in the Arctic Ocean are caused by the irregular drift dynamics. In February 2004, the Russian ice-research camp North Pole 32 established on a floe in the Arctic Ocean ceased its working activity and was abandoned after a catastrophic icequake. In this communication, the data collected during the last month of the field observations were used for calculating the changes in the kinetic energy of the ice floe. The energy distribution functions corresponding to periods of different drift intensity were analyzed using the Tsallis statistics, which allow one to assess a degree of deviation of an open dynamic system, such as the drifting ice, from its equilibrium state. The obtained results evidenced that the above-mentioned critical fragmentation has occurred in the period of substantially nonequilibrium dynamics of the system of ice floes. The determination of the state of the pack (in the sense of its equilibrium/nonequilibrium) could provide some useful information on forthcoming icequakes.