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.
Highlights
From the viewpoint of conventional mechanics, the Arctic sea ice cover (ASIC) is the consolidated, mobile, deformable system
E scaling is a manifestation of long-range correlations between separated events in a statistical system. e correlation radius is determined by the spatial decay of the event effect. e decaying is fast in equilibrium systems but slow in nonequilibrium ones. erefore, the fractal structures are formed only under nonequilibrium conditions in statistical systems driven by external forcing
Classical statistical mechanics are constructed on the implication of the independence of individual events involved in the mechanical process; each event produces an additive contribution. e additivity of this kind is the basic property of closed systems
Summary
From the viewpoint of conventional mechanics, the Arctic sea ice cover (ASIC) is the consolidated, mobile, deformable system. E NESM was successively applied for assessing the degree of deviation of natural dynamic systems from their equilibrium state prior to large-scale hazards, such as earthquakes [5, 6] and oods [7]. According to the NESM, the formation of fractal structures, such as fragmented ice pack, is a result of nonequilibrium dynamics of open systems. The sea ice dri dynamics during a few bursts of signi cant fragmentations, which could be regarded as natural hazards, were analyzed in terms of the NESM. The time series of the kinetic energy variation of an individual ice oe were analyzed using the Tsallis statistics in order to obtain a thermodynamic characteristic of the system of dri ing ice prior to and during large-scale sea ice fragmentations. 100 km F 1: AVHRR image taken from NOAA satellite on 6 December 2003 in the region around 82∘N, 5∘E
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
