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Posted Tue Mar 24 2009: from
Nature:
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Pancake ice takes over the Arctic http://apocadocs.com/s.pl?1237913933
... In the past, Arctic waters have been dominated by thick slabs of sea ice that last from one year to the next. But sea-ice cover is diminishing and thick ice that lasts for several years is disappearing fast, with researchers seeing a greater proportion of thin, newly formed ice.... Under these conditions, globs of ice crystals tossed about in the water combine to form first a soupy mixture called 'grease ice', and then 'pancakes' of thin ice a metre or two in diameter.
This can have all sorts of knock-on effects. Because the pancakes are round, for example, they have areas of open water between them when joined up, making the surface darker overall. This could have a warming effect as a result of less of the Sun's radiation being reflected. Water also slops up from these holes over the ice so that falling snow melts rather than settling, keeping the surface darker.
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[Read more stories about:
arctic meltdown, albedo effect, climate impacts, feedback loop]
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