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Sea-ice arching and multiple flow states of Arctic pack ice

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Abstract:

Flow of ice through narrow channels is significantly affected by the amount of shear strength in plastic rheologies used in sea-ice models as well as in reality. When thermodynamics is added to this problem, the capability of multiple flow states for the same forcing through narrow passages arises. To understand this problem and examine the potential for seasonal stoppage of flow through passages constraining the Arctic basin outflow, the effect of sea-ice rheology on idealized flow through narrow passages is first analyzed. This ideal analysis is then combined with thermodynamic effects and fluctuating wind fields in an Arctic basin dynamic–thermodynamic sea-ice model with multiple outlet passages. The results demonstrate that the capability for multiple flow states existing through passages depends on the initial conditions and general 'climate' state, and yield insight into the general parameter range over which the seasonal stoppage might irreversibly shift to an unconstrained outflow regime.

Document Type: Research Article

DOI: http://dx.doi.org/10.3189/172756406781811448

Publication date: November 1, 2006

More about this publication?
  • The Annals of Glaciology is a peer-reviewed, thematic journal published 2 to 4 times a year by the International Glaciological Society (IGS). Publication frequency is determined and volume/issue numbers assigned by the IGS Council on a year-to-year basis and with a lead time of 3 to 4 years. The Annals of Glaciology is included in the ISI Science Citation Index from volume 50, number 50 onwards.

    Themes can be on any aspect of the study of snow and ice. Individual members can make a suggestion for a theme for an Annals issue to the Secretary General, who will forward it to the IGS Publications Committee. The IGS Publication Committee will make a recommendation for an individual themed Annals issue, together with a potential Annals Chief Editor for that issue, to IGS Council. The IGS Council will make the decision whether to proceed, taking into account the spread of topics and the overall capacity for publication of pages in Annals.

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