TORONTO – The Arctic sea ice has reached its annual minimum summer extent for the year, according to the National Snow and Ice Data Center (NSIDC).
NSIDC measures the extent of sea ice rather than the area. Extent will always be a higher value than area, since extent measures the edges of the ice and all the space between it. In measuring area, any holes devoid of ice within that space would be taken into account.
Watch: Animation of daily Arctic sea ice extent and seasonal land cover change May 16-Sept. 12, 2013, the day before NSIDC estimated that sea ice reached its minimum area of extent.
Satellite data collected by NSIDC found that the sea ice shrunk to 5.10 million square kilometres in 2013, significantly higher than 2012 when it measured 3.41 million square kilometres, the lowest on record.
Still, this summer’s minimum makes it the sixth lowest in…
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