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Latest Data From MASIE

February 23, 2017

By Paul Homewood


As well as their main dataset of sea ice extent, NSIDC also have Arctic data from MASIE, (Multisensor Analyzed Sea Ice Extent).

The two datasets are not directly comparable as they are calculated in different ways. In addition, MASIE data only starts in 2006.

Nevertheless, as even NSIDC themselves accept, it is MASIE which is the more accurate product.




When we compare data for 21st Feb, we find that current extent is higher than 2006, 2007, 2011 and 2015:




Moreover, the year with the greatest extent was 2014, and this was only 1.9% higher than this year. Clearly Arctic sea ice is much more stable than we are told.


Temperatures in the Arctic have been plummeting this month, so it is likely that sea ice will continue to grow for a while yet.



  1. February 23, 2017 6:08 pm

    MASIE also supplies kmz daily files which open up in Google Earth. Some example are in my recent update ice watch.

  2. February 23, 2017 6:11 pm

    Reblogged this on Wolsten.

  3. Ian Magness permalink
    February 23, 2017 6:18 pm

    Ooops! That’s the huge end-2016 Arctic warming anomaly almost gone. Still, it was a good story whilst it lasted.
    Paul, to put the data in further perspective, overlaying the graph with the line for the whole of 2016 would be really useful. No doubt it will end at c252K / 7K positive anomaly v the mean, but it would be nice to see where else it had been in 2016.

  4. Bitter&twisted permalink
    February 23, 2017 9:17 pm

    But the Arctic will be ice-free in 2017.
    So mad professor Wadhams tells me.

  5. Athelstan permalink
    February 24, 2017 12:07 am

    Good analytical stats ‘n’ stuff Paul, only confirming what we all, ever expected – that: rumours of the demise of Arctic sea ice are greatly exaggerated and how!

  6. February 24, 2017 6:35 am

    Never mind the data, it’s what the BBC says that counts:

    “Reduction in Arctic Ice
    The Arctic sea ice should be reaching its maximum extent about now, but following a continuing trend and unusually warm weather at the North Pole, the growth of sea ice has stopped. What will this mean for ice cover in the Northern hemisphere summer? Are we heading for an ice free Arctic sooner than we thought?”

    Is that true, or did you hear it on the BBC?

    • 1saveenergy permalink
      February 24, 2017 2:56 pm

      Anyone got a screenshot of that BBC statement ??

  7. bea permalink
    February 24, 2017 8:23 am

    When was this broadcast?

    “The Arctic sea ice should be reaching its maximum extent…the growth of sea ice has stopped…”

    Isn’t the second statement simply what should FOLLOW from the first statement? The fact that sea ice growth has NOT stopped, then, indicates that this is an unusually prolonged freeze.

  8. February 24, 2017 2:20 pm

    ‘Temperatures in the Arctic have been plummeting this month’

    The El Niño effect is wearing off.

  9. Gerry, England permalink
    February 24, 2017 3:32 pm

    The first thing that struck me with the graph for 21 February over the years is ‘where is the problem?’. The variation is so small it is hardly noteworthy.

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