These people are supposed to be the incorruptible gatekeepers of the raw data but they are 'adjusting' it to fit their narrative.
From James Delingpole writing at Breitbart:
Icegate: Now NSIDC Caught Tampering With Climate Records
You’ve read about the climate fraud committed ‘on an unbelievable scale’ by the shysters at NASA.
You’ve read about how NOAA overestimated US warming by 50 percent.
Now it’s NSIDC’s turn to be caught red-handed fiddling the data and cooking the books.
NSIDC – National Snow and Ice Data Center – is the US government agency which provides the official statistics on such matters as sea ice coverage in the Arctic.
Naturally its research is of paramount importance to the climate alarmists’ narrative that man-made global warming is causing the polar ice caps to melt. At least it was until those ice caps refused to play ball…
Where the alarmists have for years been doomily predicting ice free summers in the Arctic – according to Al Gore in 2007, 2008 and 2009 it would be gone by 2013 – the truth is that multi-year ice has been staging a recovery since 2009.
All of the above links go to corroborating data - these are facts folks, not a narrative. Much more at the site. It gets interesting:
Far worse, though, they’ve gone and deleted all the old style maps from their archive.
At least they thought they had.
But a sharp eyed reader of Goddard’s managed to find one old style map that NSIDC had forgotten to delete. This enabled Goddard to compare the new style map with an old style map for the same week. What he discovered is that NSIDC has been making some dramatic and unexplained adjustments to the record: about half the 5+ year sea ice which should be there, for example, has been mysteriously erased.
Here is a chart Goddard has composed showing the differences.
The two charts are pretty damning - the 'adjusted' numbers have zero bearing on actual ice extent. Do not forget that we have excellent records from polar explorers of ice-free winters in arctic areas. It is more a condition of ocean currents and winds than overall temperature.
Remember the 2013 Russian exploration ship that got stuck in the ice at Commonwealth Bay? They were following in the footsteps of the Douglas Mawson expedition of 100 years prior. Here is film shot by Mawson's crew as they landed in Commonwealth Bay in 1912. As you can see, the bay was choked with ice:
Things are going to get interesting if the climate follows the current predictions - a 30-50 year cooling period as the Sun passes through a low-energy cycle.
This is just a classical Hegelian dialectic - a political tool, not science.