"John Hall" wrote in message ...


Ah. I've been wondering what the difference between "extent" and "area"
was, but I think that implicitly answers my question. So the "area" is
the total surface area of the frozen bits, while the "extent" is the
area that is at least partially frozen?
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Yes, broadly correct I think. But a more formal answer at:

http://nsidc.org/cryosphere/seaice/d...rminology.html