Why the huge sea-ice discrepancies NOAA v University of Colorado

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Offline litespeed

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I have been researching sea ice and have two sources, one from NOAA and one from University of Colorado Snow and Ice Data Center. These two sources do not even come close to matching. What am I missing here.....

Fall 2006, NOAA reports: "... decline of 10% per decade in the Arctic perennial ice cover and the 7% per decade retreat in the Bellingshaussen/Amundsen Seas ice cover in the Antarctic."
http://adsabs.harvard.edu/abs/2006AGUFM.C52A..04C

February 2009, Colorado reports a decrease of 4.1% per decade decrease in Arctic ice and an increase of 0.9% per decade in Antarctic ice.
http://nsidc.org/seaice/characteristics/difference.html

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Offline LeeE

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This is the problem with summaries like these: you really need to be made aware of the statistical methods and the reference datums they're using.

Ideally, the raw datasets that were used should be made available for independent analysis; no idea if that's the case or not, but without independent peer review any such statements and conclusions are pretty meaningless.
...And its claws are as big as cups, and for some reason it's got a tremendous fear of stamps! And Mrs Doyle was telling me it's got magnets on its tail, so if you're made out of metal it can attach itself to you! And instead of a mouth it's got four arses!

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Offline litespeed

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LeeE - You wrote: "...without independent peer review any such statements and conclusions are pretty meaningless."

Such huge discrepancies in such an esoteric field of study seem incomprehensible. The principle ice cover researchers could hardly number more then a few dozen world wide. They should all be on a first name basis! Its a level of carelessness that seems more and more endemic to the entire field of climate study.

Now we learn: "The United Nations' expert panel on climate change based claims about ice disappearing from the world's mountain tops on a student's dissertation and an article in a mountaineering magazine."

http://www.telegraph.co.uk/earth/environment/climatechange/7111525/UN-climate-change-panel-based-claims-on-student-dissertation-and-magazine-article.html
« Last Edit: 07/02/2010 14:08:08 by BenV »