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Arctic Ice Extent Understated Because of 'Sensor Drift' http://apocadocs.com/s.pl?1235055483
In May, 2008 they went so far as to predict that the North Pole would be ice-free during the 2008 'melt season,' leading to a lively Slashdot discussion. Today, however, they say that they have been the victims of 'sensor drift' that led to an underestimation of Arctic ice extent by as much as 500,000 square kilometers. The problem was discovered after they received emails from puzzled readers, asking why obviously sea-ice-covered regions were showing up as ice free open ocean. It turns out that the NSIDC relys on an older, less-reliable method of tracking sea ice extent called SSM/I that does not agree with a newer method called AMSR-E. So why doesn't NSIDC use the newer AMSR-E data? 'We do not use AMSR-E data in our analysis because it is not consistent with our historical data.' Turns out that the AMSR-E data only goes back to 2002, which is probably not long enough for the NSIDC to make sweeping conclusions about melting. The AMSR-E data is updated daily and is available to the public. Thus far, sea ice extent in 2009 is tracking ahead of 2005, 2006, 2007, and 2008, so the predictions of an ice-free north pole might be premature.
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HarryP says: "Whew! That was close!"
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'Doc Jim says:
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Thank goodness! It's all a mistake! It's not happening after all!
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From the slashdot comments: "When are you "climate change sheep" going to stop using the fact that some ice is melting or the climate has "changed" (it's ALWAYS changed in case you didn't know) as an excuse to peddle crisis hysteria that says the end of the world is coming."
Ugh. As if there's not "a preponderance of evidence" in a multitude of ecosystems, regions, data sets...
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