fig04.htm

Figure 4. "Asymmetric'' model of an Arctic Ice Sheet: principal stages: (A) initial stage: a coupled asymmetric system of a floating ice shelf and a grounded marine ice dome; (B) middle stage: the same coupled system after a few thousand years of further growth; (C) cataclysmic stage: collapsing of the ice dome and ensuing glacial surges and seawater eruption. Note that, due to ice-sheet asymmetry, the Atlantic-bound surging was moderate, while the Arctic-bound (poleward) surging was super-powerful. Fine dotted lines depict ice-sheet profiles of a previous stage; a bold dash-dotted line - an "ultimate'', high and convex, profile of the AIS; the gray arrow indicates ice-dome lowering when it collapses, the black arrows - fast ice flow, and the white arrows - megasurge/megaflood and water eruption directions.


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