Sunday, June 17, 2012

Arctic sea ice area falling rapidly

Above graph, produced by Neven Acropolis of the Arctic Sea Ice Blog from Cryosphere Today data, features in the recent post at Climate Progress, entitled: Death Spiral Watch: Arctic Sea Ice Takes A Nosedive.

As Neven adds, 2012 has over half a million of square kilometres less ice than record minimum years 2007 and 2011.

In above image, from the National Snow and Ice Data Center (NSIDC), Neven compares sea ice extent in March 2012 and June 2012, illustrating how much sea ice has disappeared within the past three months.

Note the difference between sea ice extent and area, as described in te NSIDC FAQ page:
A simplified way to think of extent versus area is to imagine a slice of Swiss cheese. Extent would be a measure of the edges of the slice of cheese and all of the space inside it. Area would be the measure of where there is cheese only, not including the holes. That is why if you compare extent and area in the same time period, extent is always bigger.
For more graphs, also read Neven's post ASI 2012 update 5: when graphs agree, and my earlier post Arctic sea ice volume on track to reach zero around 2015

I like to add an image that I made some time ago:

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