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NSIDC Starts Graphing Greenland Ice Melt

For years, the National Snow and Ice Data Center (NSIDC) has been sharing daily updates of the area (“extent”) of sea ice coverage in the Arctic ocean, charting current conditions in comparison to the 1979-2000 average for purposes of comparison. Current levels consistently lie two standard deviations below that long-term average, making the NSIDC Arctic [...]

Surprise Late-Season Melt: Arctic Sea Ice Extent Falls Below 2008 Level

The melting of the Arctic sea ice literally crossed another line yesterday, as the area of Arctic sea ice fell below the level of two years ago:

The collapse of the Arctic sea this year is only surpassed by the calamity of 2007. The four lowest years of Arctic sea ice extent are the [...]

Double Dip: Arctic Ice Resumes Late Season Melt

Last week, the National Snow and Ice Data Center reported:

Arctic sea ice appears to have reached its annual minimum extent on 10 September. The minimum ice extent was the third-lowest in the satellite record, after 2007 and 2008, and continues the trend of decreasing summer sea ice.

But appearances can occasionally be deceiving. After [...]

Arctic Sea Ice Extent, October 27 2009: 6 Standard Deviations Below the 1979-2000 Mean

The latest data on sea ice extent in the Arctic Ocean includes information up through October 27, 2009:

Source: National Snow and Ice Data Center

The National Snow and Ice Data Center’s standard for measuring a notable deviation from the 1979-2000 sea ice average is two standard deviations, which is a reasonably strong standard, [...]

Arctic Sea Ice Update: Less Ice Than 2008, Far Below 1979-2000 Average

Don’t fear the data.

The latest data on sea ice extent — updated on Thursday October 29, 2009 to reflect the most recently available data, up through Tuesday October 27, 2009 — in the arctic from the National Snow and Ice Data Center:

This updated data shows that as of October 27 2009, there’s [...]

Arctic Sea Ice Reaches Lowest Extent for the Year, Surpassed in Melt only by 2007

According to the National Snow and Ice Data Center, the Arctic ice has melted to its greatest extent and, as winter creeps in, is beginning to refreeze. As the following graph from the NSIDC shows, the extent of Arctic ice this year is far below the average for years past, and the amount of open [...]

Will 2008 Arctic Sea Ice Reach a Record Low Extent?

The National Ice and Snow Data Center has released its measurements of the extent of sea ice in the Arctic Ocean through the end of August. The area of the Arctic Ocean covered with ice is at its second-lowest point since measurements began (last year was the record):

The rate of sea ice loss [...]