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by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

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Arctic air spills both through Alaska and Greenland

 This is the main action for the winter.  I did Greenland yesterday, but now I noticed that Alaska is just as active.  The physics at work here, is density flow.  That is, the air mass over the Arctic is much denser than the surrounding air, due to intense cold.  This dense air acts as a headpond for a leaky dam.  If a spill starts, it etches its way into forming a channel of cold.  That can be

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