Aviso: Inconsistencias en los datos de hielo multianual

Acabamos de asistir a una gran revisión de datos respecto al hielo multianual por parte de los científicos del NSIDC. Han presentado una animación con la edad del hielo entre septiembre de 2009 y septiembre de 2010, en la que los datos que usan no tienen nada que ver con los que ellos mismos habían presentado anteriormente para esas mismas fechas.

Lo vemos con los mapas correspondientes a la semana número 30, a finales de julio 2010, antes y después de esta inexplicada revisión (observar el cambio de colores, con un hielo que “rejuvenece” inexplicadamente):

Desarrollaremos más este asunto.

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4 respuestas a Aviso: Inconsistencias en los datos de hielo multianual

  1. Chilli dijo:

    Nice find. I wonder if we’ll get an explanation.

    Combine this with Meier’s cherry picked 2006/2010 comparison photo of multi-year ice – (bound to be less after the freak 2007 wind-based flushout of MYI) – and the dodgey gif animation which incorrectly shows 2 yo ice as 1 yo ice by the end of the animation giving the false impression of a massive change over 1 year..

    Overall it was a very unscientific, alarmist presentation by Meier.

    • Thanks, Chilli.

      An explanation from Julienne Stroeve:
      http://stevengoddard.wordpress.com/2010/10/22/a-closer-look-at-the-nsidc-ice-age-animation/#comment-6571
      “I believe the difference you are seeing is because during this summer C. Fowler received more buoy data that was then incorporated into the ice motions. Once this happens, the data changes slightly.

      The buoy data are very important to incorporate into the ice motion fields, especially in summer when it’s harder to track the ice using satellite passive microwave data that can be affected by surface melt. The final ice motion product is a blend of passive microwave, visible, thermal satellite data and buoy data. But for real-time analysis, not all those fields are available. After the data are received, the ice motions are reprocessed, and consequently the ice age. It’s the same as NSIDC’s final ice concentration/extent products. We use real-time data, but once we get the better quality controlled satellite fields, we reprocess. There is always a trade off between real-time and higher quality data for use in climate studies.”
      END OF JULIENNE STROEVE´S EXPLANATION

      BUT I STILL HAVE SOME DOUBTS…
      The changes are not limited to the last few months, but they reach until the week 37 of 2009.

      Look at the map of the week 37 of 2009 as published in Tschudi et al. 2010, page 6: http://soa.arcus.org/sites/soa.arcus.org/files/sessions/2-1-observations-arctic-change/pdf/2-1-3-tschudi-mark.pdf
      Direct link to the map: http://img218.imageshack.us/img218/76/image002fl.gif

      And this is the map of the week 37 of 2009 as shown in Walt Meier´s animation:

      Large changes…

      It is strange for me that so many new buoy data of about a year ago have been received recently…

  2. Pingback: A Better Visualization Of The 2010 Ice Recovery | Real Science

  3. amazingsnow dijo:

    jolines, que interesante, a ver si hará falta algún wikileaks de asuntillos climáticos.

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