Category Archives: Extent

Global Sea Ice Extent Reaches Lowest *Ever Level

Here once again is the up to date version of Wipneus’ graphic graphic, this time of global sea ice extent:

nsidc_global_extent_20170114

As you can see, global sea ice extent has just reached the lowest ever level in the National Snow and Ice Data Center’s satellite records going back to 1979. It was over a month later when the previous record was broken in February 2016, so there is plenty of time for the metric to fall further.

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Is the Northwest Passage Freezing or Melting?

A reader writes to ask us to explain the answer to the above question in more detail. Are you sitting comfortably once again? Then let us begin.

There has been a lot of unusual “weather” in the Arctic over the last twelve months. First of all there was an anomalously warm winter:

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NSIDC Announce The 2016 Arctic Sea Ice Maximum Extent

In the latest edition of their “Arctic Sea Ice News” the United States’ National Snow and Ice Data Center have announced that:

Arctic sea ice appears to have reached its annual maximum extent on March 24, and is now the lowest maximum in the satellite record, replacing last year’s record low. This year’s maximum extent occurred later than average. A late season surge in ice growth is still possible. NSIDC will post a detailed analysis of the 2015 to 2016 winter sea ice conditions in early April.

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Gross Deception About MASIE and the Sea Ice Index

Our title for today is a reference back to a 2015 article by Paul Homewood on his “Not A Lot Of People Know That” blog, in which he told a load of old porky pies about the National Snow and Ice Data Center’s graphs of Arctic sea ice extent. Only last week Mr. Homewood cooked up another pile of porky pies concerning the Danish Meteorolical Institute’s Arctic sea ice extent metric. Now he has turned his pie baking skills to the Multisensor Analyzed Sea Ice Extent (MASIE for short), which is “a prototype collaborative product of the National Ice Center and NSIDC”.

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DMI, MASIE and the Sea Ice Index – An Interview With Walt Meier

For some reason best known to himself Anthony Watts has jumped on the “DMIGate” bandwagon started by Paul Homewood over on this side of the Atlantic a few days ago. In his latest article Mr. Watts quotes with approval the “Not A Lot Of People Know That” article which we have already covered in some depth.

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