Monday, August 22, 2016

Compaction vs scattering, sea ice movement favours some extent gains on the leeward side until spreading gets water to be prominent.

   August 20-21 JAXA sea ice extent map,  has a particular feature of interest.  Sea ice extent drop was largely diminished on 21 august,  despite larger sea water areas.  Note the rotation of the remainder ice pack. Notice stable sea ice shores on the wind compaction side,  but the leeward side is scattered and badly broken,  there is no ice to stop movement but sea water,  the ice spreads out and gains overall extent amidst water not exceeding 85% coverage per grid.  Test this out by placing your mouse cursor on the leeward and windward shore lines.  There are significant gains in extent with badly broken up sea ice vs compacted areas almost apparently not rotating counterclockwise.  Extent figures will eventually drop much further when the scattering isolates the loosened ice pans further for melting in warmer water.  WD August 21,2016

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