sunshine hours

October 25, 2012

Arctic Sea Ice Not As Bad As They Claimed??? DMI

Filed under: Arctic Sea Ice — sunshinehours1 @ 7:24 AM

Among the ice charts I peek at every day is the one from DMI (Danish Meteorological Institute).

Today there was a new Sea Ice Extent Chart with this text at the bottom:

The plot above replaces an earlier sea ice extent plot, that was based on data with the coastal zones masked out.

That implied that the previous sea ice extent estimates were underestimated.

The new plot displays absolute sea ice extent estimates.


Arctic Sea Ice Extent supposedly bottomed out around 2.5 million sq km according to the old chart posted by DMI for months.


Imagine my surprise when today the Sea Ice Extent bottomed out at 4 million sq km. and the chart looked like

Maybe that explains why Arctic-roos site isn’t showing any charts.


  1. What happened to that drop in ice in early august from that huge storm? It’s gone in the updated graph. Perhaps they want to erase the ice loss from that storm?

    Comment by kramer — October 25, 2012 @ 6:50 PM | Reply

    • Good point. The Aug storm was well displayed in the old graph.

      Maybe that is the point?

      Comment by sunshinehours1 — October 25, 2012 @ 7:17 PM | Reply

  2. It looks as if this year’s ice extent and all the past years have been shifted up by about 2 m km2. How could such a shift be justified and the implied error over the years perpetuated?

    Comment by Philip Lee — October 25, 2012 @ 6:57 PM | Reply

  3. The storm jammed ice onto the coasts, which are now taken into account. So the drop wasn’t.

    Comment by Brian H — October 25, 2012 @ 9:33 PM | Reply

  4. […] Arctic Sea Ice Not As Bad As They Claimed??? DMI […]

    Pingback by Arctic Ice and the DMI deficit | Watts Up With That? — October 26, 2012 @ 12:01 AM | Reply

  5. […] Arctic Sea Ice Not As Bad As They Claimed??? DMI « sunshine hours […]

    Pingback by Oops Settled science: Did we say that Arctic sea ice bottomed out at 2.5 million sq km? We meant 4 million sq km « Tarpon's Swamp — October 26, 2012 @ 5:20 AM | Reply


    This graph consistently showed the bottom at around 4.

    Comment by J — October 26, 2012 @ 7:22 AM | Reply

  7. Changing one’s metric *today* never justifies changing history. It is true that those who ignore history are doomed to repeat it. That is because we have much to learn from history that can help us avoid repeating it. But when we change our history for our own convenience, we lose the ability to learn from it.
    Changing your own history is lying to yourself. It doomed the civilization of the Pharaohs.
    I would rather own an ugly Timex watch that keeps good time, than the most beautiful gold and gem-encrusted Rolex that doesn’t run at all.

    Comment by tadchem — October 26, 2012 @ 10:59 AM | Reply

  8. There is still something not explained in the shifts shown in the graphs — why should the average peak be around 16 mil sq km when the old graph show all those past years average peak at 14.

    Comment by Philip Lee — October 26, 2012 @ 1:13 PM | Reply

  9. Sorry, the old peak was at 12 — damn short term memory.

    Comment by Philip Lee — October 26, 2012 @ 1:16 PM | Reply

    • Using 2012:

      2.5 to 4 for the low = 1.5

      11.5 to 15 or so for the high. = 3.5


      Comment by sunshinehours1 — October 26, 2012 @ 1:31 PM | Reply

  10. […] could have a hand in the game. Also changes in measurement methodology and the evaluation routines have caused jumps in the curves. Does a melting Arctic present only disadvantages? It does not make a contribution to […]

    Pingback by Analysis Shows That Arctic Sea Ice Melt Extent Mostly Occurs In Natural Cycles — July 17, 2013 @ 3:13 AM | Reply

  11. […] hře by mohlo mít prsty i slunce. Také změny v metodologii měření a vyhodnocovací rutiny způsobili určité poskoky v křivkách. Představuje snad současné tání Arktidy jedině nevýhodu? Nevytváří […]

    Pingback by Analýza o zalednění Severního ledového oceánu — September 30, 2013 @ 4:50 AM | Reply

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