DMI Fixes Their Ice Graph

I have been pointing out for some time that DMI Arctic sea ice graphs don’t match their maps, and now they have fixed their graphs. The imaginary rapid melt from mid-May to mid-June which they showed previously, has disappeared.2016-06-28055336


Ocean and Ice Services | Danmarks Meteorologiske Institut

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7 Responses to DMI Fixes Their Ice Graph

  1. RAH says:

    How do the map or quantify ice extent and volume from satellites when there is broa and continuous heavy cloud cover? Are they imaging using sensors that work outside of the visual spectrum? Radar? IR?

    • Rud Istvan says:

      For sure at least radar altimetry in addition to microwaves, which can see the ice floating above the ocean. Also solves the meltwater pool problem that somewhat confounds microwave sensing. Essay Northwest Passage has details.

  2. TA says:

    “The imaginary rapid melt from mid-May to mid-June which they showed previously, has disappeared.”

    Isn’t that pitiful! Who can you trust on this subject anymore? Answer: Tony Heller.

  3. Steve Fraser says:

    The chart std deviation indications conflict. Inside the box, it says +- 2 std dev. Below the box, it says +- 1

    Glad to see that the curves are getting fixed. Now, back inside the patterns of recent years.

  4. Winnipeg Boy says:

    Let’s just crank the numbers for two months. Enough time to get some headlines and scare Mr. Heinz. We can adjust them back in a media blackout and no one will know anything happened in a year or a decade.

  5. “Calculation of ice concentration in coastal zones have been improved”

    I think I remember that such an improvement was one of the main reason for the previous major change where DMI discontinued the previous record. But I couldn´t find that previous article.

  6. puzzled says:

    Has the “fix” been undone since the June 28 post? Also, graph lines for years 2013-2015 seem to have shifted notably. Portions of these lines that formerly approached the mean are now well below it. It appears the mean value has recently been changed in that mean for June 21 graph was 1979-2000, while mean for June 29 graph is 1981-2000.

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